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Table of contents
Safety Precautions page 2
Purpose and function page 3
Design and construction page 3
Features page 3
Back panel view page 4
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Back panel description
Inputs page 6
Outputs
System installation
Making the connection
Specifications page 11
Troubleshooting
Warranty
Accessories included: Manual
Power cord
Page 1
page 5
page 7
page 8
page 9
page 12
page 13
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A
SAFETY PRECAUTIONS
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PLEASE READ BEFORE INSTALLING
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 ‘ofT when plugging in or unplugging input and speaker
cables!!!
When plugging in or unplugging interconnect cables running from
source to preamplifier, always mute the preamplifier and rotate the
preamplifiers volume control to minimum first. It is recommended that
you turn the amplifier ‘off as well for this operation.
The EX4420M 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.).
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.
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The EX4420M's purpose and function
The EX4420M is a compact, very efficient, single channel power amplifier. It is
designed to be used in all types of audio or audio/video systems.
Design and construction
The EX4420M 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 EX4420M 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.
Goid 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.
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Making the connection
Before doing anything, ensure that the power switch on the amplifier’s front
panel is in the ‘off position (rocker side in towards center of amplifier). 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 po\wer
input receptacle in the rear panel. Do not connect it to the AC power source
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Connect the audio cables from your preamplifier’s output to the corresponding
input connector on the amplifier. (Refer to Diagram 1)
Connect the wires from your speakers to the appropriate (R,L,C) output on the
amplifier. It is absolutely essential that you observe correct polarity in these
connections. (Refer to Diagram 1)
Example: If you connect your right front output of your preamplifier to channei 1 input
on the amplifier, remember to connect your right front speaker wires to channei 1 's
outputs. Always observe polarity when connecting speakers, connect amplifiers (+) to
the speakers {+) and amplifiers (-) to speakers (-).
Double check all connections.
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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 12.
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Limited Warranty
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 othenMise 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.
____________________________________________________
RETURNING EQUIPMENT
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No equipment may be returned to B&K Components LtiJ. Without a RETURN AUTHORIZATION. Should
you find if 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. Your name, address, and phone number.
2. The model and serial number of the equipment being returned.
3. Adescription 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.
Customer service hours are 10:00am tol2:00pm and 1:00pm to 4:00pm EST.
B&K Components Ltd. 2100 Old Union Road, Buffalo New York 14227
1-800-543-5252 or 1-716-656-0023
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