B&K Reference 4420 Manual de usuario
B & K Components Ltd.
P/N 12692
B&K Components, Ltd., 2100 Old Union Road, Buffalo, New York 14227
Page 1
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
Manual and Power cord
Page 2
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 Reference 4420 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 3
The Reference 4420 is a compact, very efficient, two channel power amplifier. It is
designed to be used in all types of audio or audio/video systems.
The Reference 4420 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 4420 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.
- Efficient high current transformer for improved dynamics.
- More accurate and three dimensional reproduction of source
material.
- Improves low level detail for smoother, more musical sound.
- For efficient and linear power delivery.
- 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.
- Low noise resistors for better sound and a greater degree
of repeatability.
- Ability to reproduce demanding recordings.
- Large capacity computer grade electrolytic capacitors
for extended low frequency control and improved dynamics.
Page 4
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
1. AC fuse holder - Holds the AC Line fuse. This fuse is an 12 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 7.
Page 5
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 - 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.
A control is provided on each Reference 4420 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 4420. 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 6
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
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.
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.
Page 7
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:
Unbalanced - 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 -
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 always in
unbalanced mode.
Page 8
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.
Here is a typical input setup:
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