Krell Industries Stereo Amplifier KAV280p User Manual

KAV–280p  
Remote Control  
Preamplifier  
THE LEADER IN AUDIO ENGINEERING  
Instructions for Use  
Owner’s Reference  
 
Contents  
Page  
INTRODUCTION  
DEFINITION OF TERMS  
UNPACKING  
1
2
3
PLACEMENT  
4
4
AC Power Guidelines  
FRONT PANEL DESCRIPTION  
BACK PANEL DESCRIPTION  
6
9
REMOTE CONTROL DESCRIPTION  
Battery Installation and Removal  
Remote Control Functions  
12  
12  
12  
CONNECTING THE KAV–280p TO YOUR SYSTEM  
Connection Steps  
15  
15  
OPERATING YOUR KAV–280p  
Preamplifier Operation  
16  
16  
17  
Tape Input and Output  
CONFIGURING THE KAV–280p  
FOR THEATER THROUGHPUT  
19  
HOW TO TROUBLESHOOT SYSTEM NOISE  
QUESTIONS AND ANSWERS  
WARRANTY  
20  
21  
22  
RETURN AUTHORIZATION PROCEDURE  
SPECIFICATIONS  
23  
Back Cover  
Krell KAV–280p  
iii  
 
Illustrations  
Page  
FIGURE 1 The KAV–280p Front Panel  
FIGURE 2 The KAV–280p Back Panel  
FIGURE 3 The KAV–280p Remote Control  
5
8
11  
iv  
Krell KAV–280p  
 
Introduction  
Thank you for your purchase of the Krell KAV–280p Remote  
Control Preamplifier. The KAV-280p uses current mode and sur-  
face mount technologies derived directly from the state-of-the-art  
Krell KCT Preamplifier.  
The Class A direct-coupled design of the KAV–280p means that  
the signal path is fully balanced from input to output. This includes  
a fully balanced volume control. Circuits are powered by a dedicat-  
ed supply with discrete voltage regulators and there is a separate,  
dedicated power supply for all digital control circuits. All signal  
switching is accomplished via hermetically sealed multiple contact  
precision relays.  
The KAV–280p provides a high level of operational convenience  
and functional versatility. It is easy to integrate into your system.  
The remote control accesses all amplifier functions, and remote  
control connection options on the back panel allow the KAV–280p  
to be easily connected with other components. With its unique  
Theater Throughput TM feature, the KAV–280p can easily adapt to  
home theater applications.  
This owner’s reference manual contains important information on  
the placement, installation, and operation of the KAV–280p.  
Please read this information carefully. A thorough understanding of  
these details will help ensure satisfactory operation and long life  
for your KAV–280p and related system components.  
Krell KAV–280p  
1
 
Definition of Terms  
Following are the definitions of key terms used in your owner’s ref-  
erence manual.  
CONFIGURATIONS  
Theater Throughput  
Theater Throughput is a Krell configuration option that allows the  
signal from a surround preamp/processor to pass through a Krell  
preamplifier or integrated amplifier with no gain, for integrated vol-  
ume and balance management of Krell home theater systems.  
Balanced  
INPUT AND OUTPUT  
CONNECTIONS  
A symmetrical input or output circuit that has equal impedance  
from both input terminals to a common ground reference point.  
The industry standard for professional and sound recording instal-  
lations, balanced connections have 6 dB more gain than single-  
ended connections and allow the use of long interconnect cables.  
Balanced connections are completely immune to induced noise  
from the system or the environment.  
Single-ended  
A two-wire input or output circuit. Use care when using single-  
ended connections as the ground connection is made last and  
broken first. Turn the system off prior to making or breaking single-  
ended connections. Single-ended connections are not recom-  
mended for connections requiring long cable runs.  
Off  
OPERATION  
The component is off when the AC power cord is unplugged from  
the wall receptacle.  
Stand-by Mode  
A low power consumption status that keeps the audio circuits at  
idle. When you plug the AC power cord into the wall receptacle,  
the red stand-by LED illuminates. The component is now ready to  
be switched to the operational mode. Krell recommends leaving  
the component in the stand-by mode when it is not playing music.  
Operational Mode  
When the component is in the stand-by mode, and you press the  
power button on the front panel or the power key on the remote  
control, the blue power LED illuminates. The component is in the  
operational mode and is ready to play music.  
2
Krell KAV–280p  
 
Definition of Terms, continued  
Krell Current Mode  
TECHNOLOGY  
A proprietary Krell circuit topology in which the audio gain stages  
of a component operate in the current rather than voltage domain.  
This unique technology provides the component with exceptional  
speed and a wide bandwidth.  
Surface Mount Technology (SMT)  
SMT allows individual circuit elements to be placed very close  
together. This shortens signal paths and allows circuit elements to  
operate at the same temperature, resulting in more accurate signal  
transfer and enhanced reliability.  
Unpacking  
1. Open the shipping box and remove the top layer of foam. The  
following items are visible:  
1
1
KAV–280p Remote Control Preamplifier  
Accessory Kit containing:  
1
1
1
1
AC power cord  
12 VDC (12 V trigger) cable  
KAV–280p remote control  
CR2025 lithium battery for the remote  
1
Packet containing the owner’s reference and the warranty  
registration card.  
2. Grasp the underside of the preamplifier and lift it straight out of  
the packing box.  
3. Place the preamplifier in a safe location and remove the pro-  
tective plastic wrapping.  
If any of these items are not included please contact your authorized  
Krell dealer.  
Notes  
Save all packing materials. If you must ship your KAV–280p in the future,  
repack the unit in its original packaging to prevent shipping damage.  
Krell KAV–280p  
3
 
Placement  
Before you install the KAV–280p into your system, review the fol-  
lowing guidelines to choose the location for the KAV–280p. This  
will facilitate a clean, trouble-free installation. The KAV–280p does  
not require any type of special rack or cabinet for installation. For  
the dimensions of the KAV–280p, see Specifications, on the back  
cover.  
Place the KAV–280p on a firm, level surface, away from excessive  
heat, humidity, or moisture. The KAV–280p is not hum-sensitive.  
Other components may be placed on or around the KAV–280p.  
Make sure the top and bottom ventilation grids are unobstructed.  
You may experiment with feet or cones as long as they are not  
permanently affixed to the chassis. Any unauthorized modifications  
to the electronics or chassis will void the warranty.  
The KAV–280p has superb regulation and does not require a dedi-  
cated AC circuit. Avoid connections through extension cords or  
multiple AC adapters. High quality 15 amp grounded AC strips are  
acceptable. High quality AC line conditioners or filters may be  
used if they are grounded. Contact your authorized Krell dealer,  
distributor, or Krell before using any devices designed to alter or  
stabilize the AC power for the KAV–280p.  
AC Power  
Guidelines  
The KAV–280p should be operated only with the power cord  
supplied.  
4
Krell KAV–280p  
 
 
Front Panel Description  
See Figure 1 on page 5  
The front panel of the KAV–280p accesses power on and off,  
Front Panel  
Functions  
analog input selections, volume control, and mute. The front panel  
display shows the volume and balance levels, and Theater  
Throughput status.  
POWER  
1 Power Button  
Use this button to switch the KAV–280p between the stand-by and  
the operational modes.  
2 Power LED  
The blue power LED illuminates when the KAV–280p is in the  
operational mode. The power LED also flashes when any remote  
control key is pressed.  
3 Stand-by LED  
The red stand-by LED illuminates when the KAV–280p is plugged  
into a standard AC wall receptacle, indicating that the amplifier is  
in the stand-by mode and ready to be switched to the operational  
mode.  
4 Infrared Sensor  
The infrared sensor receives commands from the KAV–280p  
remote control. For proper remote control operation, make sure  
the infrared sensor is clear of any obstructions.  
ANALOG  
5 S-1, S-2, S-3, and B-1 Buttons and LEDs  
SOURCE  
COMPONENTS  
Use these buttons to select a balanced analog source component  
(B-1) via an XLR connector or a single-ended analog source com-  
ponent (S-1, S-2, or S-3) via single-ended RCA connectors. The  
selected button’s LED illuminates.  
6 Tape Button  
Use this button to playback pre-recorded tapes. You may also use  
this button to compare the output signal of an analog tape recorder  
to an audio source. See Tape Input and Output, on page 18.  
7 Tape LED  
The red tape monitor LED illuminates when the tape monitor is  
activated. The LED does not illuminate when an audio source is  
activated.  
6
Krell KAV–280p  
 
Front Panel Description continued  
MODE INDICATORS  
8 Mute Button  
Use this button to interrupt the signal from the active source you  
have selected. When the red mute LED (9) on the KAV–280p is  
illuminated, there is no signal output.  
To unmute the signal from the active source, press the mute but-  
ton again. The red mute LED extinguishes.  
9 Mute LED  
The red mute LED illuminates when you have interrupted the signal  
from the active source using the mute button (8) on the front panel  
or mute key (25) on the remote.  
10 Level Knob  
VOLUME ADJUSTMENT  
FUNCTIONS  
The volume level knob adjusts the processor output level, which  
is indicated numerically on the front panel display (11); range is  
0-151.  
To access the balance feature, use the remote control. See  
Balance Keys, on page 13.  
11 Front Panel Display  
The front panel display shows volume levels, balance levels, and  
Theater Throughput status.  
Krell KAV–280p  
7
 
 
Back Panel Description  
See Figure 2 on page 8  
The KAV–280p back panel provides connections for all inputs and  
outputs, power on/off, and additional remote connections.  
Back Panel  
Functions  
12 Left and Right Balanced Analog Inputs  
The KAV–280p is equipped with one pair of balanced (B-1) inputs  
via XLR connectors.  
ANALOG INPUTS  
13 Left and Right Single-ended Analog Inputs  
The KAV–280p is equipped with three pairs of single-ended (S-1,  
S-2, or S-3) inputs via RCA connectors.  
14 Left and Right Tape Inputs  
The KAV–280p is equipped with a pair of single-ended tape inputs  
via RCA connectors.  
15 Left and Right Tape Outputs  
ANALOG OUTPUTS  
The KAV–280p is equipped with a pair of single-ended tape  
outputs via RCA connectors.  
16 Left and Right Single-ended Outputs  
The KAV–280p is equipped with a pair of single-ended preamplifier  
outputs.  
17 Left and Right Balanced Outputs  
The KAV–280p is equipped with a pair of balanced preamplifier  
outputs.  
17 12 VDC Out  
BACK PANEL REMOTE  
CONNECTIONS  
The KAV–280p is equipped with an output that sends 12 VDC  
(12 V trigger) power on/off signals to other Krell components and  
other devices that incorporate a 12 V trigger. This allows you to  
turn other components on or off, or to and from stand-by, from the  
KAV–280p. When the KAV–280p is switched between stand-by  
and operate, it sends a signal from the 12 VDC Out that will switch  
other components, allowing whole systems or parts of systems to  
be easily coordinated.  
Krell KAV–280p  
9
 
Back Panel Description, continued  
BACK PANEL REMOTE  
17 12 VDC In  
CONNECTIONS, continued  
The KAV–280p is equipped with an input that receives 12 VDC  
(12 V trigger) power on/off signals from other Krell components  
and other devices that incorporate a 12 V trigger. This allows you  
to turn the KAV–280p on or off, or to and from stand-by, from other  
components.  
The 12 VDC output current is limited to 30 ma.  
Notes  
Consult the owner’s reference of the components used in a custom  
installation to take full advantage of the remote capability of the  
KAV–280p.  
18 RC-5 In  
The KAV–280p is equipped with an RC-5 input that makes custom  
installation easy and secure by accepting baseband RC-5 input  
commands from hardwired remote controllers.  
POWER  
19 Line Fuse and Fuseholder  
The 50/60 Hz line fuse protects the KAV–280p in the event of a  
component failure.  
The fuseholder drawer houses two line fuses: one is functional  
and one is a spare.  
When the line fuse needs to be replaced, use the spare fuse provided.  
Unplug the component before replacing the fuse. Use a 0.5A, slow-blow,  
5 x 20 mm fuse for 100-120 VAC, or a 0.25A, slow-blow, 5 x 20 mm fuse  
for 220-240 VAC.  
Note  
20 IEC Connector  
The connector is for use with the provided IEC standard 15 amp  
power cord.  
10  
Krell KAV–280p  
 
Figure 3 The KAV–280p Remote Control  
Power  
22 Power Key  
23 Pre Key  
22  
23  
25  
Analog Functions  
24 Analog Input Keys  
25 Tape Key  
26  
Output Control  
Functions  
26 Mute Key  
24  
27  
27 Vol (Volume) Keys  
28 Bal (Balance) Keys  
28  
Note  
The remote control keys listed above function with the KAV–280p. Other  
keys on this remote control may activate other Krell components, for exam-  
ple, other compact disc players. Consult the Krell owner’s reference manual  
for each component to review the remote control capabilities for each Krell  
component.  
Krell KAV–280p  
11  
 
Remote Control Description  
See Figure 3 on page 11  
The KAV–280p remote control uses one CR2025 lithium battery,  
which is included with the shipment.  
Battery  
Installation  
and  
To open the battery compartment on the back of the remote  
control:  
Removal  
1. Place the remote face down on the table.  
2. Use your thumbnail or a small jeweler’s or eyeglass screw-  
driver to move the small switch toward the center of the  
remote, while using your index fingernail or screwdriver to pull  
down gently on the slot to the right of the switch. The battery  
compartment will slide out.  
Do not use a knife or other sharp objects to open the battery compart-  
ment; they will scratch the remote control finish.  
Note  
3. Place the battery, positive side up, in the battery tray.  
4. Slide battery compartment back into the remote until you hear  
a click.  
The remote control is ready for operation.  
Replace battery when remote control function becomes intermittent.  
Notes  
Remove battery if the remote control is not used for a long period of time.  
Battery leakage can damage the remote control.  
The KAV–280p remote control accesses all preamplifier functions.  
A description of the remote control keys that activate the  
KAV–280p follows.  
Remote Control  
Functions  
Note  
When you press a function key on the remote, the blue power LED (2) will  
flash. (The LED will flash repeatedly if a key is held down.)  
POWER  
22 Pwr (Power) Key  
Use this key to switch the KAV–280p between the stand-by and  
the operational modes.  
12  
Krell KAV–280p  
 
Remote Control Functions continued  
POWER, continued  
23 Pre Key  
Use this key to activate the KAV–280p remote and access other pre-  
amplifier commands. You can then access preamplifier commands  
until you press a different activation key, for example the CD key to  
access commands for a Krell compact disc player. To return to the  
preamplifier commands, press the pre key again. You only need to  
press an activation key once. The remote “remembers” whether the  
pre key or the CD key has been pressed most recently.  
ANALOG FUNCTIONS  
24 Analog Input Keys  
Use these keys to select a balanced input (B-1) or single-ended  
input (S-1, S-2, or S-3). The selected input LED on the front panel  
illuminates.  
25 Tape Key  
Use this key to monitor the output signal of a three-head analog  
tape recorder, compared to the output signal from an audio  
source, when making a recording. See Tape Input and Output,  
on page 18. The red tape monitor LED on the front panel illumi-  
nates when the tape monitor is activated.  
OUTPUT CONTROL  
FUNCTIONS  
26 Mute Key  
Use this key to interrupt the signal from the active source you  
have selected. When the red mute LED (9) on the KAV–280p is  
illuminated, there is no signal output.  
To unmute the signal from the active source, press the mute key  
again. The red mute LED extinguishes.  
27 Vol (Volume) Keys  
Press these keys to adjust the amplifier output level, which is indi-  
cated numerically on the front panel display (11); range is 0-151.  
28 Bal (Balance) Keys  
Use these keys to shift the balance to the left or the right channel,  
in 1 dB increments. Balance level is indicated in the front panel  
display (11).  
Krell KAV–280p  
13  
 
Remote Control Functions continued  
Analog Functions,  
To access and display balance, push either the “L” or the “R” bal-  
continued  
ance key on the remote. The front panel display indicates the bal-  
ance setting. After 3 seconds of inactivity or after a volume adjust-  
ment, the front panel display reverts to the volume setting.  
The front panel display indicates:  
C –  
when the balance is centered. If the balance is not centered, the  
front panel display indicates balance right or left of center, and  
how much the balance is off center, on a scale of 1 (slightly off  
center) to 5 (completely on one side).  
Example: A display of:  
– – 3  
means that the balance is moderately right of center. A display of:  
5 – –  
means the balance is severely left of center.  
Note  
The remote control keys listed above function with the KAV–280p. Other  
keys on this remote control may activate other Krell components, for  
example, compact disc players. Consult the Krell owner’s reference man-  
ual for each component to review the remote control capabilities for each  
Krell component.  
14  
Krell KAV–280p  
 
Connecting the KAV–280p  
to Your System  
USING BALANCED  
CONNECTIONS  
Krell recommends using balanced interconnect cables. Balanced  
interconnect cables not only can minimize sonic loss but are also  
immune to induced noise, especially with installations using long  
cables. Balanced connections have 6 dB more gain than single-  
ended connections. When level matching is critical, keep this gain  
value in mind.  
Follow these steps to connect the KAV–280p to your system.  
Connection  
Steps  
1. Make sure all power sources and components are off before  
connecting inputs and outputs.  
2. Neatly organize the wiring between the KAV–280p and all sys-  
tem components. Separate AC wires from audio cables to  
prevent hum or other unwanted noises from being introduced  
into the system.  
3. Connect the outputs of your source components to the inputs  
on the KAV–280p.  
The KAV–280p has one pair of balanced outputs via XLR con-  
nectors and one pair of single-ended outputs via RCA connec-  
tors. Both balanced and single-ended outputs are active at all  
times, allowing simultaneous connections to separate ampli-  
fiers or separate systems.  
Do not connect both outputs to a single stereo amplifier at one time.  
Note  
4. Connect the outputs of the KAV–280p to the inputs of your power  
amplifier.  
The KAV–280p is equipped with one balanced input via XLR  
connectors (B-1), three single-ended inputs via RCA connectors  
(S-1, S-2, and S-3), and one tape input via RCA connectors.  
The B-1, S-1, S-2, and S-3 inputs can be configured for Theater  
Throughput. See Configuring the KAV–280p for Theater  
Throughput, on page 19.  
5. Plug the AC cord into the IEC connector (21) on the back  
panel of the KAV–280p. Plug the remaining end into the AC  
wall receptacle. The red stand-by LED (3) illuminates, and the  
front panel display will flash – – ” for 10 seconds. When the  
display stops flashing, the preamplifier is ready to use.  
Krell KAV–280p  
15  
 
Connecting the KAV–280p to Your System continued  
Pin 1 Shield (ground)  
Pin assignments for the  
XLR connectors  
Pin 2 Non-inverting (hot) (0°)  
Pin 3 Inverting (cold) (180°)  
RC-5 IN  
Additional  
This input accepts baseband RC-5 input commands. It facilitates  
custom installations by allowing the KAV–280p to be controlled via  
hard-wired signals from various remote devices.  
Connections  
12 VDC REMOTE POWER IN / OUT  
The input accepts 12 Volt power on/off signals from other Krell  
components and the output sends 12 volt power on/off signals to  
other Krell components, as well as to other devices that incorpo-  
rate a 12-Volt power on/off trigger input.  
This feature allows enables the remote turn on/off of other compo-  
nents when the KAV–280p is powered on/off.  
Consult the owner’s reference of any device used in a custom installation  
to take full advantage of the remote capability of the KAV–280p.  
Note  
16  
Krell KAV–280p  
 
Operating Your KAV–280p  
This section provides information about operating the KAV–280p.  
The KAV–280p provides basic input selection and volume control  
operation from the front panel. The remote control includes addi-  
tional preamplifier functions as well as CD transport and amplifier  
controls. See Remote Control, on page 12, for more information.  
The KAV–280p Remote Control Premplifier is easy to operate.  
Preamplifier  
Operation  
1. When the preamplifier is in stand-by mode, with the red stand-  
by LED (3) illuminated, turn the preamplifier on by pressing the  
power button (1), or pressing the power key (22) on the remote  
control. The blue power LED (2) illuminates, and the red stand-  
by LED (3) turns off. The preamplifier is now ready for opera-  
tion.  
2. To access preamplifier functions via the remote control, press  
the pre key (23) on the remote control.  
When you press a function key on the remote, the blue power LED (2)  
will flash.  
Note  
3. Choose a listening source and select the source input.  
4. Start playing the source. Set the volume to a comfortable lis-  
tening level using the level knob(10) or volume keys (28).  
5. When changing sources, lower the volume to the off position or  
mute the output (see Mute, on page 13). This insures that the  
next source played will not damage your system with a high  
output transient.  
6. To turn the preamplifier off, press the power button (1) or  
power key (22). The red stand-by LED (3) illuminates.  
When powering up any system, always turn amplifiers on last. When  
powering down, always turn amplifiers off first.  
Note  
Krell KAV–280p  
17  
 
Operating Your KAV–280p, continued  
The KAV–280cd has a discrete tape input and output. The tape  
Tape Input and  
Output  
output is used to send an input signal from S-1, S-2, S-3, or B-1 to  
a recording device or processor. You can use the tape feature in  
three ways:  
1. Use this button to playback pre-recorded tapes.  
2. Use the tape input to compare the output signal of a three-  
head analog tape recorder to the output signal of an audio  
source, when making a recording. To activate this function,  
select an audio source for recording using either the S-1, S-2,  
S-3 (13), or B-1 (12) analog input buttons (5) or keys (24).  
Press the tape button (6) or tape key (25) on the remote con-  
trol to switch between the tape recorder output (red tape moni-  
tor LED [7] illuminated) and the input source (red tape monitor  
LED [7] not illuminated).  
3. Use the tape output to create a processor loop, when the  
KAV–280p is connected to a graphic equalizer or other ancil-  
lary equipment. To activate this function, connect the equip-  
ment to the KAV–280p tape outputs (15) as described in the  
equipment manufacturer’s manual. Press the tape button (6) or  
tape key (25) on the remote control to switch between the  
processor output (red tape monitor LED [7] illuminated) and  
the input source (red tape monitor LED [7] not illuminated).  
Note  
When changing sources, lower the volume to off or mute the output. This  
ensures that the next source played does not damage your system with  
a high output transient.  
18  
Krell KAV–280p  
 
Configuring the KAV–280p for Theater Throughput  
To simplify the integration of an audio/video surround sound  
processor into your system, set any input on the KAV–280p (S-1,  
S-2, S-3, or B-1) to operate as a unity gain stage. Krell calls this  
configuration Theater Throughput.  
When you configure a KAV–280p input for Theater Throughput,  
the KAV–280p volume and balance controls are transferred to the  
audio/video surround sound processor, for integrated volume and  
balance management as well as ease of operation. As long as the  
KAV–280p input is configured for Theater Throughput and con-  
nected to the audio/video surround sound processor’s input config-  
ured for Theater Throughput, all KAV–280p volume and balance  
adjustments are made through the surround sound processor.  
When you disengage the KAV–280p input from Theater  
Throughput, the volume and balance controls revert to the  
KAV–280p.  
1. Turn on the KAV–280p power.  
How to Activate  
an Input for  
Theater  
2. Press and release the button (5) for the device you wish to  
configure for Theater Throughput. The LED illuminates.  
Throughput  
3. Press the button again and hold it for four seconds. The word  
thr appears on the front panel display (11).  
Make sure the level on the source component is set to zero when  
configuring the KAV–280p input set for Theater Throughput. Source  
components without level controls should not be connected to an  
input configured for Theater Throughput. Doing so can result in  
excessive and possibly damaging volume levels when the source is  
played. Always turn off the source component before you configure  
any input on the KAV–280p for Theater Throughput.  
IMPORTANT  
1. Turn on the KAV–280p power.  
How to Disengage  
an Input for  
Theater  
2. Press and release the button (5) for the device you wish to dis-  
engage from Theater Throughput. The LED illuminates.  
Throughput  
3. Press the button again and hold it for four seconds. The word  
thr disappears from the front panel display (11), indicating that  
Theater Throughput is disengaged.  
Krell KAV–280p  
19  
 
How to Troubleshoot System Noise  
AC grounding becomes critical when connecting high performance  
audio components. When you mix and match audio components,  
each with its own ground potential, a low frequency hum may  
occur in one or both loudspeakers. This sometimes occurs when  
introducing a new component into a system.  
If a low frequency hum emanates from the loudspeakers when you  
place the KAV–280p preamplifier into the system, follow these sim-  
ple troubleshooting steps:  
1. Check all cable terminations, making sure they have solid sol-  
der joints and are of sound construction.  
2. With the system amplifier off, remove the interconnect cables,  
from all the analog source components to the KAV–280p.  
(Leave the interconnect cables from the KAV–280p to the sys-  
tem amplifier.) Turn the amplifier back on.  
3. If the hum disappears, turn the amplifier off and reinsert the  
interconnect cables from one of the analog source compo-  
nents. Turn the amplifier back on and select, on the  
KAV–280p, the source component you have just connected.  
Carefully increase the volume on the KAV–280p. If the hum  
reappears in one or both channels, those interconnect cables  
may be defective. Have the interconnect cables checked  
before proceeding.  
4. Repeat Step 3 for each analog source component. Connect  
only one new component at a time. There is no need to dis-  
connect source components you have already connected.  
5. If the interconnect cables are sound, you may be experiencing  
a ground loop. Please contact your authorized Krell dealer, dis-  
tributor, or Krell for suggestions on how to solve this problem.  
20  
Krell KAV–280p  
 
Questions and Answers  
Q. Should I leave my KAV–280p on all the time?  
A. Krell recommends leaving the amplifier in the stand-by mode,  
ready to play music. If you are not going to play music for a  
long time, you may disconnect the amplifier from AC power  
supply.  
Q. When I turn on the amplifier there is a loud hum through the  
loudspeakers. What should I do?  
A. When a new component is introduced into a system, a low  
frequency hum may occur in one or both loudspeakers. Check  
all input and output connections, making sure they are of  
sound construction. See How to Troubleshoot System  
Noise, on page 20. If the interconnects and cables are sound,  
you may be experiencing a ground loop. This can often be  
easily eliminated. Please contact your authorized Krell dealer,  
distributor, or Krell for suggestions on how to solve this  
problem.  
Q. When I use the KAV–280p’s Theater Throughput capability  
with my surround sound processor, where should I set the  
volume on the KAV–280p?  
A. You do not need to set the volume on the KAV–280p because  
the preamplifier’s volume and balance controls are not active  
in the Theater Throughput mode. When using the KAV–280p’s  
Theater Throughput capability, the surround sound processor  
controls the system volume. See Configuring the KAV–280p  
for Theater Throughput, on page 19.  
Krell KAV–280p  
21  
 
Warranty  
This Krell product has a limited warranty of five years for parts and labor on circuitry. Should  
this product fail to perform at any time during the warranty, Krell will repair it at no cost to the  
owner, except as set forth in this warranty.  
To register your product  
for warranty benefits,  
please complete and return  
the Warranty Registration  
Card enclosed in the ship-  
ping box within 15 days of  
purchase. Thank you.  
The warranty does not apply to damage caused by acts of God or nature.  
The warranty on this page shall be in lieu of any other warranty, expressed or implied, includ-  
ing, but not limited to, any implied warranty of merchantability or fitness for a particular purpose.  
There are no warranties which exceed beyond those described in this document. If this product  
does not perform as warranted herein, the owner’s sole remedy shall be repair. In no event will  
Krell be liable for incidental or consequential damages arising from purchase, use, or inability to  
use this product, even if Krell has been advised of the possibility of such damages.  
Proof of purchase in the form of a bill of sale or receipted invoice substantiating that the unit is  
within the warranty period must be presented to obtain warranty service. The warranty begins  
on the date of the original retail purchase, as noted on the bill of sale or receipted invoice from  
an authorized Krell dealer or distributor. Previously owned equipment, when re-purchased from  
an authorized Krell dealer or distributor, has the balance of the original warranty, based on the  
original date of manufacture.  
The warranty for Krell products is valid only in the country to which they were originally shipped,  
through the authorized Krell distributor for that country, and at the factory. There may be restric-  
tions on or changes to Krell’s warranty because of regulations within a specific country. Please  
check with your distributor for a complete understanding of the warranty in your country.  
If a unit is serviced by a distributor who did not import the unit, there may be a charge for serv-  
ice, even if the product is within the warranty period.  
Freight to the factory is your responsibility. Return freight within the United States (U.S.A.) is  
included in the warranty. If you have purchased your Krell product outside the U.S.A. and wish  
to have it serviced at the factory, all freight and associated charges to the factory are your  
responsibility.  
Krell will pay return freight to the U.S.A.-based freight forwarder of your choice. Freight and  
other charges to ship the unit from the freight forwarder to you are also your responsibility.  
Krell is not responsible for any damage incurred in transit. Krell will file claims for damages as  
necessary for units damaged in transit to the factory. You are responsible for filing claims for  
shipping damages during the return shipment.  
Krell does not supply replacement parts and/or products to the owner of the unit. Replacement  
parts and/or products will be furnished only to the distributor performing service on this unit on  
an exchange basis only; any parts and/or products returned to Krell for exchange become the  
property of Krell.  
No expressed or implied warranty is made for any Krell product damaged by accident, abuse,  
misuse, natural or personal disaster, or unauthorized modification.  
Any unauthorized voltage conversion, disassembly, component replacement, perfora-  
tion of chassis, updates, or modifications performed to the unit will void the warranty.  
The operating voltage of this unit is determined by the factory and can only be changed by an  
authorized Krell distributor or at the factory. The voltage for this product in the U.S.A. cannot be  
changed until six months from the original purchase date.  
In the event that Krell receives a product for warranty service that has been modified in any  
way without Krell authorization, all warranties on that product will be void. The product will be  
returned to original factory layout specifications at the owner’s expense before it is repaired. All  
repairs required after the product has been returned to original factory specifications will be  
charged to the customer, at current parts and labor rates.  
All operational features, functions, and specifications and policies are subject to change without  
notification.  
22  
Krell KAV–280p  
 
Return Authorization  
Procedure  
If you believe there is a problem with your component, please con-  
HOW TO EXPEDITE  
SERVICE  
tact your dealer, distributor, or the Krell factory to discuss the  
problem before you return the component for repair. To expedite  
service, you may wish to complete and e-mail the Service Request  
Form in the Service section of our website at:  
To contact the Krell Service Department:  
TEL  
203-799-9954  
Monday-Friday, 9:00 am to 5:00 pm EST  
203-799-9796  
FAX  
E-MAIL  
HOW TO RETURN  
A PRODUCT  
To return a product to Krell, please follow this procedure so that  
we may serve you better:  
1. Obtain a Return Authorization Number (R/A number) and ship-  
ping address from the Krell Service Department.  
2. Insure and accept all liability for loss or damage to the product  
during shipment to the Krell factory and ensure all freight (ship-  
ping) charges are prepaid.  
The product may also be hand delivered if arrangements with the  
Service Department have been made in advance. Proof of pur-  
chase will be required for warranty validation at the time of hand  
delivery.  
IMPORTANT  
Use the original packaging to ensure the safe transit of the product  
to the factory, dealer, or distributor. Krell may, at its discretion,  
return a product in new packaging and bill the owner for such pack-  
aging if the product received by Krell was boxed in nonstandard  
packaging or if the original packaging was so damaged that it was  
unusable. If Krell determines that new packaging is required, the  
owner will be notified before the product is returned.  
HOW TO PURCHASE  
ADDITIONAL PACKING  
To purchase additional packaging, please contact your authorized  
Krell dealer, distributor, or the Krell Service Department for assis-  
tance.  
SERIAL NUMBER  
Your KAV–280p product serial number is:  
Krell KAV–280p  
23  
 
Krell Industries, Inc.  
KAV–280p  
Remote Control  
Preamplifier  
v 02.0  
45 Connair Road  
Orange, CT 06477-3650 USA  
TEL 203-799-9954, FAX 203-891-2028  
Specifications  
All operational features, functions,  
specifications, and policies are  
subject to change without  
notification.  
FREQUENCY RESPONSE  
20 Hz-20 kHz +0 dB, -0.04 dB  
0.2 Hz-300 kHz +0, -3 dB  
INPUTS  
(ALL INPUTS MAY BE SET UP FOR  
THEATER THROUGHPUT)  
1 pair balanced via XLR connectors  
SIGNAL TO NOISE RATIO  
>98 dB “A” weighted  
>90 dB wideband  
3 pair single-ended via RCA  
connectors  
OUTPUTS  
TOTAL HARMONIC DISTORTION  
(THD)  
1 pair balanced via XLR connectors  
1 pair single-ended via RCA  
connectors  
20 Hz-20 kHz <0.004%  
GAIN  
TAPE INPUT AND OUTPUT  
6.2 dB  
single-ended output  
balanced output  
1 pair single-ended via RCA  
connectors  
12.3 dB  
REMOTE CONTROL  
OUTPUT  
9 Vrms  
1 handheld wireless remote  
1 12 VDC Out/In (12 V trigger)  
single-ended output  
balanced output  
18 Vrms  
1 RC-5 input via a DC power  
connector  
INPUT IMPEDANCE  
43 kOhms single-ended input  
86 KOhms balanced input  
DIMENSIONS  
17.3w x 3.5h x 17.3d in.  
43.8w x 8.9h x 43.8d cm  
OUTPUT IMPEDANCE  
120 Ohms single-ended output  
240 Ohms balanced output  
WEIGHT  
Shipping 22.0 lb., 10.0 kg  
Unit only 16.0 lb., 7.3 kg  
POWER CONSUMPTION  
22 W stand-by  
25W  
on  
 

KTI Networks Switch KGS 800L User Manual
La Crosse Technology Weather Radio 308 1451H User Manual
Lantronix Switch SLSLP400PS201 User Manual
Life Fitness Home Gym X5 101 User Manual
Lopi Indoor Fireplace Gas Stove And Fireplace User Manual
Lux Products Thermostat PSD010BC User Manual
Marantz VCR MV8300 User Manual
Melissa Coffeemaker 745 95 User Manual
Metra Electronics Automobile Accessories 99 8903B User Manual
Midland Radio Weather Radio 75 822 User Manual