BK Stereo Amplifier AV2500 Series II User Manual

B & K Components Ltd.  
P/N 12695  
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Safety Precautions  
Purpose and function  
Design and construction  
Features  
Page 2  
Page 3  
Page 3  
Page 4  
Rear panel view  
Rear panel description  
Control muting  
Level controls  
Page 4  
Page 5  
Page 5 - 6  
Page 6  
Inputs  
Page 7  
Outputs  
Page 8  
Internal bus  
Page 9  
Jumper description  
Mono application  
Bridged application  
System installation  
Making the connection  
Troubleshooting  
Care and cleaning  
Specifications  
Page 9 - 10  
Page 11  
Page 12  
Page 13  
Page 13 - 14  
Page 15  
Page 15  
Page 16  
Page 17  
Warranty  
Manual and Power cord  
Page 1  
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WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT  
TO RAIN OR MOISTURE.  
The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the  
user of the presence of uninsulated “dangerous voltage” within the product’s enclosure  
that may be sufficient magnitude to constitute a risk of electric shock to you.  
The exclamation point within an equilateral triangle is intended to alert the user of the  
presence of important operating and maintenance (servicing) instructions in the  
literature accompanying the unit.  
Observance of polarity is essential. Double-check connections before turning  
the amplifier on. The amplifier can be damaged if polarities are incorrect.  
Damage can occur to your speakers if the power rating* of each individual driver  
is exceeded by the amplifier. Ensure that all the drivers in your speaker system  
are capable of handling not only the power being delivered by the amplifier, but  
the energy that is likely to be generated during strong passages.  
Turn amplifier ‘off’ when plugging in or unplugging input and speaker cables!!!  
The AV2500 series II is equipped with raised feet so that continuous ventilation  
can be maintained. They help to maintain acoustic feedback into the amplifier at  
a minimum. They also provide a measure of protection against scratching any  
surface the unit might be resting on.  
Do not stack anything on top of the amplifier (preamplifier, processor,  
source...etc.).  
Leave at least 2-3 inches clearance from the top of the amplifier to the next shelf,  
component, etc., to ensure proper ventilation.  
* If you are at all unsure of what the speaker ‘ratings’ are, contact your dealer.  
Page 2  
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The AV2500 series II is a compact, very efficient, five channel power amplifier. It is  
designed to be used in all types of audio or audio/video systems. The term versatile is  
almost adequate to describe the variance of operational modes the AV2500 series II is  
capable of providing. This is all accomplished through the simple placement of internal  
jumpers and the paralleling or bridging of it’s outputs and/or linking multiple AV2500  
series II’s.  
Here is a listing for some of the many tasks it can be set up to perform:  
&
The most obvious function for the AV2500 series II is to take five separate  
audio inputs and provide five separate amplified outputs. Your AV2500  
series II has arrived set up in this configuration.  
&
&
&
With the inputs buffered, a line output (OUT BUS) may be taken from  
either the L BUS, R BUS, or L+R BUS and sent on to another amplifier.  
This allows for linking of multiple amplifiers.  
Continuing its versatility, the AV2500 series II may be used mono to  
provide one, high current channel in order to drive a speaker requiring  
more power.  
As a result of the AV2500 series II’s unique bus system, the input to  
channels 4 and 5 may be inverted thereby allowing the possibility of  
creating a single high voltage (bridged) channel from one source, through  
the left bus.  
The AV2500 series II utilizes high quality electronic circuitry to achieve an environment  
wherein a detailed, transparent, and highly musical sound can be realized. The high  
quality parts complement include state-of-the-art solid state devices, 1% metal film  
resistors, computer grade electrolytic power supply capacitors, and a high capacity  
toroidal transformer.  
Page 3  
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- Efficient high current transformer for improved dynamics.  
- More accurate and three dimensional reproduction of source  
material.  
- Provides short term protection from accidental shorting of output  
devices and protection from thermal overload.  
- Improve connections for better sound and minimized signal  
loss and degradation.  
of repeatability.  
- Low noise resistors for better sound and a greater degree  
- Ability to reproduce demanding recordings.  
- Large capacity computer grade electrolytic capacitors  
for extended low frequency control and improved dynamics.  
1. AC fuse holder  
2. AC Input receptacle  
3. Speaker outputs  
5. Line Level outputs  
6. RCA inputs  
7. Level controls  
4. Amplifier control muting input/output  
Page 4  
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1. AC fuse holder -  
Holds the AC Line fuse. This fuse is an 8 Amp / 250 Volt  
Slow Blow fuse. Replace with same type and value fuse  
only.  
2. AC Input receptacle - For attaching the supplied AC power cord to the  
amplifier.  
3. Speaker outputs -  
For connecting the speakers to the amplifier. Explained  
further on page 8.  
4. Amplifier control muting input/output -  
To provide remote switching of mute on/off of the amplifier.  
Explained further on page 5.  
5. Line level outputs -  
For connecting signal to another amplifier (daisy chaining).  
6. RCA inputs -  
For connecting signal patch cables (interconnects) from the  
preamplifier to the amplifier to pass signal.  
7.Level controls -  
For adjusting the input level to the amplifier. Explained  
further on page 6.  
A control is provided on each AV2500 series II amplifier to allow remote switching of  
mute on/off. The preamplifier’s control output, such as is provided with B&K series  
preamplifiers, can be utilized to provide a control signal to the AV2500 series II. If more  
than one amplifier is being controlled, the control signal can be extended to include  
each successive unit by simply running an RCA type audio cable from the CTRL OUT  
connector of the first amplifier to the CTRL IN connector of the next unit (commonly  
referred to as ‘daisy chaining’). An example of how to connect two amplifiers is  
illustrated in figure B.  
If a source other than a B&K series preamplifier is used to control multiple amplifiers,  
only the control output voltage from the source is critical. It must be within the range, as  
indicated on the rear panel, 5-24 volts DC is required. The amplifier will provide each  
successive amplifier with a control voltage of 12 volts DC for reliable operation. The  
amplifiers control output may be used as a source of 12 VDC @ 125 mA for other user  
applications as well.  
Page 5  
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If the control function is desired, each unit in the system must remain connected at all  
times and the control must be enabled. To enable the control function, the CTRL  
ENABLE button must be out for each controllable amplifier in the system. For more  
information on the amplifiers output status under various control conditions, refer to the  
table below.  
@ CTRL IN  
Signal  
Button position  
Output status  
Sound  
@ CTRL OUT  
Signal  
OUT  
IN  
Signal  
Sound  
Signal  
No Signal  
No Signal  
OUT  
IN  
Mute  
No Signal  
Signal  
Sound  
There are five level controls on the back of the amplifier. One level control for each  
channel.  
When using the level controls, first start with them turned all the way up (clockwise).  
Then adjust them according to your system requirements to match the sound level  
coming from each speaker. This is a rough adjustment for matching different driver  
impedances. Any fine tuning should be done by the preamplifier.  
Page 6  
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Example: When using 4 ohm and 8 ohm speakers together, the 4 ohm may sound  
louder then 8 ohm at a given volume level. The level controls on the amplifier are used  
to match the speakers volume level. Clockwise will increase the output. Counter  
clockwise will decrease the output.  
RCA type connectors accept line input from the preamplifier’s unbalanced output  
connectors. There are two input connectors, one for each channel, that may be used to  
connect the amplifier to the preamplifier.  
RCA cable connector -  
Here is a typical input setup:  
You will notice the OUT BUS connections shown above. You may use these to connect  
to another amplifier. The L BUS OUT carries the same signal as channel 1  
(L INPUT). The R BUS OUT carries the same signal as channel 2 (R INPUT). The  
L+R BUS OUT carries the combined signal from channels 1 and 2 (the left and right  
inputs).  
Page 7  
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Five way binding posts are provided. One pair for each channel. They are designed to  
accept a banana-type plug or spade lug connector (shown below) and are color coded  
for easy identification. The red (+) post should always be connected to the speakers (+)  
jack. The black (-) post should always be connected to the speakers (-) jack.  
Spade connector Banana jack  
Here is a typical amplifier setup:  
Page 8  
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In order to gain access to the internal bus structure, you must first remove the top  
cover. Turn the amplifier so the rear panel is facing your. The jumper modules may be  
seen on the circuit board just behind the level controls.  
Below is the default setup for the AV2500 series II amplifier. By arranging the jumpers  
allows you to configure the amplifier for different applications. If you wish to use the  
amplifier as a five channel amplifier, you need not change any of the settings.  
In order to reconfigure the AV2500 series II’s channels, remove the source control  
group jumper from its present position (if necessary) and install it on the terminal you  
wish to select as the source for that channel. Make sure it has been inserted on both  
terminal pins of the jumper modules.  
To complete the configuration, the volume group jumper should be placed at either the  
‘USE VOL’ or ‘NO VOL’ terminal depending on you configuration.  
Figure G illustrates the jumper modules used in  
configuring each channel. Each jumper terminal  
location is conveniently labeled as to the source it  
can be configured to provide. Explained further on  
the following page.  
Page 9  
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With the jumper plug set to this location on a channels jumper module will  
only let the signal present at that channel’s input to appear at it output.  
Along with being channel 2's input, it is used as the input to the right bus  
and the right source for the ‘L+R BUS’. Because it is a BUS input, any  
signal input here will appear at the ‘R BUS’ jumper terminal for both of the  
AV2500 series II’s jumper modules.  
Installing a jumper plug at this terminal on any of the five internal jumper  
modules selects the combined signal being carried by both the left and right  
inputs. If the left bus and right bus are being used to carry stereo right and  
left channels, a jumper plug installed at the ‘L+R BUS’ location will provide  
a true L+R mono output.  
Along with being channel 1's input, it is used as the input to the left bus and  
the left source for the ‘L+R BUS’. Because it is a BUS input, any signal  
input here will appear at the ‘L BUS’ jumper terminal for both of the AV2500  
series II’s jumper modules.  
If volume control is desired only from the source, or if outputs are being  
combined to obtain higher power, the jumper plug should be installed at the  
‘NO VOL’ location.  
If volume control is desired at the amplifier, beyond that provided at the  
source, a shorting plug is installed at the ‘USE VOL’ location. The ‘USE  
VOL’ setting  
combined.  
be used when channels are bridged or  
This is a single jumper module that is set apart, up and to the right from the  
channel jumper modules on the circuit board. It provides a special function,  
when the jumper is set on the ‘-L’ pins, the left bus signal feeding the left  
channel will be inverted.  
Page 10  
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The AV2500 series II’s five output channels may be paralleled (mono) to combine the  
output current for all channels. This feature allows the amplifier to increase its  
apparent output current. To use, place the source group jumper for all channels on the  
‘L BUS’ jumper terminal. Place the volume group jumper for all channels on the ‘NO  
VOL’ jumper terminal.  
The speaker output terminals on the AV2500 series II’s rear panel must be paralleled in  
order to complete the setup. Simply connect the (+) terminals for all channels together  
using jumper wires (not supplied with the amplifier). Finally, connect the speaker  
cables from channel 1's (+) and (-) terminals to the speakers. Input your source signal  
into the left channel input. The instructions show the use of the left channel. You may  
also use the right channel if you desire, just follow the above instructions using the right  
channel. You may also use the L+R BUS to send a mono signal out of the amplifier  
derived from the left and right channels. See below:  
Page 11  
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The AV2500 series II may operate with 2 channels bridged to drive a high impedance  
speaker. To use, place the source group jumper for both channels on the ‘L BUS’  
jumper terminal. Place the volume group jumper for both channels on the ‘NO VOL’  
jumper terminal. Place the invert jumper module on the ‘-L’ terminal. One of the  
bridged channels  
be either channel 4 OR 5.  
Finally, connect the speakers (+) to channel 3's (+) terminal and the speakers (-) to  
channel 4's (+) terminal. Input your source signal into the left channel input (  
).  
Page 12  
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There will most likely be a number of cables involved in the installation of your home  
entertainment system. Pre-planning is essential in order to maximize system efficiency.  
We recommend the following as a means of helping you reach that goal:  
Make a diagram of your proposed system by laying out the relative location of  
each component in the system. Then lay out the proposed cable runs between  
them. Number each cable and record its length on the diagram for future  
reference.  
Cable runs are critical in that they must be kept away from sources of power  
radiation (amplifiers, power cords, heaters, etc...). For the sake of safety, they  
should also be kept out of traffic areas.  
The process of optimizing the system will include the type of cable, the length of  
the run, and the obstructions it must deal with along its run. Your dealer can  
advise you on the products available and their relative merits. If building custom  
length audio cables is not your strength, your dealer should be able to help you  
with that as well.  
When possible, use a separate AC power line for the amplifier, one that is not  
shared by any other component in the system of any other house hold  
component.  
Before doing anything, ensure that the power switch on the amplifier’s front panel  
is in the ‘off’ position. Again, it is recommended that you locate a separate AC  
power outlet for the amplifier, one that is  
shared by any other audio  
component in the system or any other house hold component. This will eliminate  
the possibility of the amplifier ‘modulating’ the power being supplied to the  
component and compromising the signal originating from that component.  
Locate the AC power cord provided with the amplifier and plug it into the power  
input receptacle in the rear panel.  
Connect the audio cables from your preamplifier’s output to the corresponding  
input connector on the amplifier.  
Page 13  
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Connect the wires from your speakers to the appropriate output on the amplifier.  
It is absolutely essential that you observe correct polarity in these connections.  
Double check all connections.  
Plug the amplifier’s power cord into the AC power source. Turn the amplifier’s  
power switch ‘on’. The panel light should be illuminated. Leave the preamplifier  
turned off. Before proceeding to the next step turn the amplifier off and wait 30  
seconds for the amplifier to discharge. Both the preamplifier and amplifier  
should be off.  
Connect a playback unit (CD, VLD, Tuner, etc...) to the preamplifier. Turn the  
volume on the preamplifier to minimum. Turn on the preamplifier, then the  
amplifier (in that order). Set source on the preamplifier to the playback unit  
you’ve just connected. Turn volume up slowly and music should be heard from  
all channels. If this is not the case, double check your installation.  
Should you encounter any problems that cannot be traced to the source or the  
material being played, consult the “TROUBLESHOOTING” section on page 15.  
Page 14  
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PROBLEM  
POSSIBLE CAUSE  
POSSIBLE SOLUTION  
No sound  
(‘on’ LED not illuminated)  
1.  
2.  
3.  
Power cord not plugged in. 1.  
Reconnect power cord.  
Power off at AC source.  
AC power inlet fuse blown  
or faulty.  
2.  
3.  
Check AC switch or fuse.  
Check for shorts or  
overloading.  
4.  
Control switch in the wrong 4.  
position.  
Place control switch in  
proper position. (Page 5)  
No sound on some or all  
selected channels (‘on’  
LED illuminated)  
1.  
2.  
3.  
4.  
Speaker leads loose or  
faulty.  
Line stage to amp. cables  
loose. or faulty.  
Source to line stage cables 3.  
loose or faulty.  
Line stage or source not  
correctly selected.  
1.  
2.  
Tighten, repair, or  
replace cable.  
Tighten, repair or replace  
cable.  
Tighten, repair or replace  
cable.  
Check all switch settings.  
4.  
Sound lacks direction,  
bass weak  
1.  
Speakers connected out of 1.  
phase.  
Check connections  
making sure that cables  
are connected (+) to (+)  
and (-) to (-).  
Loud hum or buzz on one  
or more channels  
1.  
1.  
Poor ground connection in  
interconnect cables.  
1.  
1.  
Check all connectors and  
repair as necessary.  
Low output from amplifier  
Balanced switch in  
balanced mode when  
using unbalanced inputs.  
Put balanced switch in  
correct position.  
Channel sounds distorted  
and low in output  
1.  
Blown rail fuse.  
1.  
Replace blown rail fuse  
inside amplifier.  
** Note: If unit continues to blow power inlet fuses,  
have it serviced.  
Under normal use, the amplifier will not require any special care. Over time you may  
wish to clean the exterior of the unit by wiping it with a damp cloth to remove any dirt or  
dust that accumulates on it. Do not let any liquid enter the amplifier thru the vents in  
the top cover. You may clean the connectors on the rear panel with isopropyl alcohol  
annually.  
Page 15  
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Power rating: 8 ohms  
4 ohms  
60 watts @ 1 kHz  
Not recommended  
Frequency response  
Input sensitivity  
THD (S+N)  
5 Hz - 45 kHz  
0.77 Volts  
0.09 % @ 1 kHz  
Input impedance  
Damping factor  
Current (peak to peak)  
Slew rate  
33.2 k ohms  
80  
16 Amps  
14 V / )sec  
Dynamic headroom  
S/N (A-weighted)  
Voltage gain  
1.0 dB  
95 dB  
28  
Line voltage  
120/220/240 VAC switchable  
17"(w) X 12"(d) X 3.75"(h)  
23 lbs  
Dimensions (O.A.)  
Weight  
Power consumption  
450 watts max  
4.6 Amps max current draw  
30 watts @ no input  
Replacement fuses  
Line - 8 Amp/250 Volt Slow Blow  
Rails - 4 Amp/250 Volt Slow Blow  
Page 16  
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B&K Components Ltd., referred to herein as B&K, warrants your B&K equipment against all defects in  
material and workmanship for a period of five years from the date of purchase. This warranty applies  
only to the original purchaser and only to equipment in normal residential use and service. Defective  
equipment must be returned to B&K, prepaid, accompanied by sufficient payment to cover the cost of  
return shipping and handling, and will be repaired or replaced at the discretion of B&K whose decision  
as to the method of reparation will be final.  
This warranty shall not apply to any equipment which is found to have been improperly installed,  
incorrectly fused, misused, abused, or subjected to harmful elements, used in any way not in  
accordance with instructions supplied with the unit, or to have been modified, repaired or altered in any  
way without the expressed, written consent of B&K. This warranty does not apply to the cabinet, the  
remote controller, or appearance items such as the faceplate, control buttons, or display lenses, nor  
does it cover any expenses incurred in shipping the unit to and from the manufacturer’s service depot.  
No warranty, implied or otherwise created by State law shall extend beyond the terms of this warranty  
and B&K shall not be liable for any incidental or consequential damage arising out of a defect in material  
or workmanship of the unit during the terms of this warranty or thereafter. Some States do not allow the  
exclusion or limitation of incidental or consequential damages and the foregoing exclusions may not  
apply to you.  
This warranty gives you specific legal rights. Your may also have other rights which vary from State to  
State.  
No agent, representative, dealer or employee of B&K has the authority to increase or alter the  
obligations or terms of this warranty.  
B&K Components Ltd.  
No equipment may be returned to B&K Components Ltd. Without a RETURN AUTHORIZATION.  
Should you find it necessary to return equipment to B&K, for any reason, a RETURN AUTHORIZATION  
(RA) number must be issued by B&K in respect of the equipment being returned. You may request an  
RA number by calling B&K at the numbers below. We ask that you provide the following information at  
that time.  
1.  
2.  
3.  
Your name, address, and phone number.  
The model and serial number of the equipment being returned.  
A description of the problem being experienced.  
Your call will be referred to a Technical Service Representative who will work with you to resolve the  
problem. If it is determined that the unit must be returned for repair, an RA number will be issued.  
B&K Components Ltd.  
2100 Old Union Road, Buffalo New York 14227  
1-800-543-5252 or 1-716-656-0023  
Page 17  
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B&K Components, Ltd.  
2100 Old Union Road  
Buffalo, New York 14227  
716-656-0023  
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