B&K EX4420M User Manual
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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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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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