Reference 2220
Two Channel Amplifier
OWNER’S MANUAL
B & K Components Ltd.
13004 rev 0004
B&K Components, Ltd., 2100 Old Union Road, Buffalo, New York 14227
13004 rev 0004
Table of contents
Safety Precautions Page 2
Purpose and function Page 3
Design and construction Page 3
Features Page 3
Rear panel view Page 4
Rear panel description Page 4 - 5
Control muting Page 5 - 6
Level controls Page 6
Outputs Page 7
Inputs Page 7 - 8
System installation Page 9
Making the connection Page 9 - 10
Troubleshooting Page 11
Care and cleaning Page 11
Specifications Page 12
Warranty page 13
Accessories included: Manual and Power cord
Page 1
13004 rev 0004
SAFETY PRECAUTIONS
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PLEASE READ BEFORE INSTALLING
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 “dan
that may be sufficient ma
nitude to constitute a risk of electric shock to you.
erous voltage” within the product’s enclosure
The exclamation point within an equilateral trian
presence of important operatin
literature accompanyin
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 Reference 2220 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 alter or remove them.
Do not stack anything on top of the amplifier (preamplifier, processor,
source...etc.).
the unit.
and maintenance (servicing) instructions in the
le is intended to alert the user of the
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
13004 rev 0004
The Reference 2220's purpose and function
The Reference 2220 is a compact, very efficient, two channel power amplifier. It is
designed to be used in all types of audio or audio/video systems.
Design and construction
The Reference 2220 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.
The Reference 2220 operates class A predriver and AB high current MOSFET power
output stages. It is capable of reproducing the most demanding audio signals at rated
power levels.
Features
Toroidal Transformers - Efficient high current transformer for improved dynamics.
Discrete Circuitry - More accurate and three dimensional reproduction of source
material.
Class A Predriver - Improves low level detail for smoother, more musical sound.
AB MOSFET Output Stage - For efficient and linear power delivery.
Limited Protection - Provides short term protection from accidental shorting of output
devices and protection from thermal overload.
Gold Plated Connectors - Improve connections for better sound and minimized signal
loss and degradation.
1% Metal Film Resistors - Low noise resistors for better sound and a greater degree of
repeatability.
High Current - Ability to reproduce demanding recordings.
Computer Grade Capacitors - Large capacity computer grade electrolytic capacitors
for extended low frequency control and improved dynamics.
Page 3
13004 rev 0004
Rear Panel View
1. AC fuse holder 5. RCA inputs (unbalanced)
2. AC Input receptacle 6. Level controls **
3. Speaker outputs 7. Amplifier control muting input/output
4. Balanced inputs
** OPTIONS AVAILABLE FOR THE REFERENCE 2220 AMPLIFIER
NOTE: THE CENTER CHANNEL IS NOT AVAILABLE ON THE REFERENCE 2220 AMPLIFIER
Rear panel description
1. AC fuse holder
2. AC Input receptacle
3. Speaker outputs
- Holds the AC Line fuse. This fuse is an 12 Amp / 250 Volt
Slow Blow fuse. Replace with same type and value fuse
only.
- For attaching the supplied AC power cord to the
amplifier.
- For connecting the speakers to the amplifier. Explained
further on page 7.
Page 4
13004 rev 0004
4. Balanced inputs - For connecting balanced signal patch cables (XLR).
Explained further on page 8.
5. RCA inputs - For connecting signal patch cables (interconnects) from the
preamplifier to the amplifier to pass signal.
6. Level controls - Option available for the Reference 2220 amplifier. For
adjusting the input level to the amplifier. Explained further
on page 6.
7. Amplifier control muting input/output To provide remote switching of mute on/off of the amplifier.
Explained further below.
Control muting
A control is provided on each Reference 2220 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 Reference 2220. If more
than one amplifier is being controlled, the control signal can be extended to include
each successive unit by simply running a 3.5mm mini-jack 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.
DO NOT POWER MOTORS WITH THIS CIRCUIT.
Page 5
13004 rev 0004
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 Button position Output status @ CTRL OUT
Signal OUT Sound Signal
Signal IN Sound Signal
No Signal OUT Mute No Signal
No Signal IN Sound Signal
*Note: The control voltage is for muting control only. Each amplifier must be connected
to its own source of AC power in order for it to operate.
Level controls
The level controls are an option that can be added to the amplifier. If your amplifier has
this option, the balanced inputs are not present. You can not have level controls and
balanced inputs on an amplifier.
There are two 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.
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Page 6
13004 rev 0004
Outputs
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Five way binding posts are provided. One pair for each channel. They are designed to
accept a banana-t
for eas
jack. The black (-) post should alwa
Here is a typical amplifier setup:
identification. The red (+) post should always be connected to the speakers (+)
pe plug or spade lug connector (shown below) and are color coded
s be connected to the speakers (-) jack.
Spade connector Banana jack
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Inputs
Unbalanced - RCA type connectors accept line input from the preamplifier’s
unbalanced output connectors. There are two input connectors, one for
each channel, that ma
preamplifier.
RCA cable connector -
Operation - For unbalanced operation, ensure the balanced switch between the
balanced inputs on the rear of the amplifier is in the ‘off’ (out) position. If
the amplifier does not have balanced inputs then it is alwa
unbalanced mode.
be used to connect the amplifier to the
s in
Page 7
13004 rev 0004
Inputs
Balanced - XLR type connectors accept line input from the preamplifier’s balanced
output connectors. There are two input connectors, one for each
channel, that may be used to connect the amplifier to the preamplifier.
Balanced cable connector
Operation
- For balanced
operation, ensure the balanced switch between the balanced inputs on
the rear of the amplifier is in the ‘on’ (in) position.
-
NOTE: If the amplifier is equipped with level controls, the balanced inputs will not
be present.
Here is a typical input setup
Page 8
13004 rev 0004
System installation
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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.
Tip: Take a piece of stout string (longer than the longest cable run) and mark it at each foot of length.
Then do a mock cable run usin
next full foot, and add one foot to allow for some movement of the components. This will provide you with
the ideal cable len
th.
the string, dressing it neatly along the way. Count the divisions to the
Making the connection
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 not 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. Do not connect it to the AC power source
yet!
Connect the audio cables from your preamplifier’s output to the corresponding
input connector on the amplifier.
Page 9
13004 rev 0004
Connect the wires from your speakers to the appropriate output on the amplifier.
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It is absolutely essential that you observe correct polarity in these connections.
Example:
on the amplifier, remember to connect your ri
outputs. Always observe polarity when connectin
to the speakers (+) and amplifiers (-) to speakers (-).
If you connect your right front output of your preamplifier to channel 1 input
ht front speaker wires to channel 1's
speakers, connect amplifiers (+)
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 11.
Note: When turning equipment ‘off’, the amplifier should always be turned off
the preamplifier. When turnin
first
on
, then the amplifier. Before turnin
equipment ‘on’, the preamplifier should always be turned
anything on, ensure the preamplifier is at a
low volume level.
Page 10
13004 rev 0004
first
, then
Troubleshooting
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PROBLEM POSSIBLE CAUSE POSSIBLE SOLUTION
No sound
(‘on’ LED not illuminated)
No sound on some or all
selected channels (‘on’
LED illuminated)
Sound lacks direction,
bass weak
Loud hum or buzz on one
or more channels
Low output from amplifier 1. Balanced switch in
1. Power cord not plugged in.
2. Power off at AC source.
3. AC power inlet fuse blown
or faulty.
4. Control switch in the wron
position.
1. Speaker leads loose or
faulty.
2. Line sta
loose. or faulty.
3. Source to line sta
loose or faulty.
4. Line sta
correctly selected.
1. Speakers connected out of
phase.
1. Poor
interconnect cables.
balanced mode when usin
unbalanced inputs.
e to amp. cables
e or source not
round connection in
e cables
1. Reconnect power cord.
2. Check AC switch or fuse.
3. Check for shorts or
overloadin
4. Place control switch in
proper position. (Pa
1. Ti
2. Ti
3. Ti
4. Check all switch settin
1. Check connections
1. Check all connectors and
1. Put balanced switch in
hten, repair, or
replace cable.
hten, repair or replace
cable.
hten, repair or replace
cable.
makin
are connected (+) to (+)
and (-) to (-).
repair as necessary.
correct position.
.
e 5)
s.
sure that cables
Channel sounds distorted
and low in output
** Note
FUSE!!
:
If unit continues to blow power inlet fuses,
,
have it serviced
1. Blown rail fuse. 1. Replace blown rail fuse
inside amplifier.
DO NOT USE A HEAVIER
.
Care and cleaning
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 11
13004 rev 0004
Reference 2220 SPECIFICATIONS
Power rating: 8 ohms 220 watts @ 1 kHz
4 ohms 350 watts @ 1 kHz
Frequency response 5 Hz - 45 kHz
Input sensitivity 1.4 Volts
THD (S+N) 0.09 % @ 1 kHz
Input impedance 33.2 k ohms
Damping factor 450
Current (peak to peak) 75 Amps
Slew rate 14 V / )sec
Dynamic headroom 1.2 dB
S/N (A-weighted) 95 dB
Voltage gain 28
Line voltage 120/220/240 VAC switchable
Dimensions (O.A.) 17"(w) X 15.5"(d) X 5.75"(h)
Weight 42 lbs
Power consumption 650 watts max
6.9 Amps max current draw
70 watts @ no input
Replacement fuses Line -12 Amp/250 Volt Slow Blow
Rails - 6 Amp/250 Volt Slow Blow
Page 12
13004 rev 0004
Limited Warrant
y
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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 ori
equipment must be returned to B&K, prepaid, accompanied by sufficient payment to cover the cost of
return shippin
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 shippin
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 dama
or workmanship of the unit durin
exclusion or limitation of incidental or consequential dama
to you.
inal purchaser and only to equipment in normal residential use and service. Defective
and handling, and will be repaired or replaced at the discretion of B&K whose decision as
the unit to and from the manufacturer’s service depot.
e arising out of a defect in material
the terms of this warranty or thereafter. Some States do not allow the
es and the foregoing exclusions may not apply
This warranty
State.
ent, representative, dealer or employee of B&K has the authority to increase or alter the obligations
No a
or terms of this warranty.
ives you specific legal rights. Your may also have other rights which vary from State to
B&K Components Ltd.
RETURNING EQUIPMENT
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 bein
number by callin
time.
1. Your name, address, and phone number.
2. The model and serial number of the equipment bein
3. A description of the problem bein
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.
B&K at the numbers below. We ask that you provide the following information at that
experienced.
2100 Old Union Road, Buffalo New York 14227
1-800-543-5252 or 1-716-656-0023
returned. You may request an RA
returned.
Page 13
13004 rev 0004
B&K Components, Ltd.
2100 Old Union Road
Buffalo, New York 14227
716-656-0023
www.bkcomp.com
13004 rev 0004
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