B&K 220M User Manual

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Reference 220M

Single Channel Amplifier

OWNER’S MANUAL

B & K Components Ltd.

13005 rev 0004

B&K Components, Ltd., 2100 Old Union Road, Buffalo, New York 14227

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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 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

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SAFETY PRECAUTIONS

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 “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-checkconnections 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 220M 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 2-3inches 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 Reference 220M's purpose and function

The Reference 220M 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 Reference 220M 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-artsolid state devices, 1% metal film resistors, computer grade electrolytic power supply capacitors, and a high capacity toroidal transformer.

The Reference 220M 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.

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Rear Panel View

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

AC fuse holder

5.

RCA input (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 220M AMPLIFIER

Rear panel description

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.

4. Balanced inputs - For connecting Balanced signal patch cables (XLR). Explained further on page 8.

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DO NOT POWER MOTORS WITH THIS CIRCUIT.

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 220M 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 220M 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 220M. 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-jackcable 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, 5-24volts 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.

13005 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 is one level control on the back of the amplifier.

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.

)LJXUH &

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Outputs

Five way binding posts are provided. One pair for each channel. They are designed to accept a banana-typeplug 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

)LJXUH '

The Reference 220M amplifier has two sets of binding posts on it. They are paralleled inside the amplifier. The Channel 3 output is used for normal operation.

The amplifier comes standard with a Channel 1 and Channel 3 output. The Channel 3 output is used for normal operation, but you can use the Channel 1 output to connect to another speaker in parallel.

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Inputs

Unbalanced - RCA type connectors accept line input from the preamplifier’s unbalanced output connectors. There are two input connectors, that may be used to connect the amplifier to the preamplifier.The Channel

3 input is used for normal operation.

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.

Balanced - XLR type connectors accept line input from the preamplifier’s balanced output connectors. The Reference 220M has balanced line inputs.

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.

The Channel 3 input is used for normal operation. If the amplifier is equipped with level controls, the balanced inputs will not be present.

Here is a typical input setup:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 8

 

 

 

 

 

 

 

 

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System installation

There will most likely be a number of cables involved in the installation of your home entertainment system. Pre-planningis 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 using the string, dressing it neatly along the way. Count the divisions to the next full foot, and add one foot to allow for some movement of the components. This will provide you with the ideal cable length.

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.

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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.

Example: If you connect your right front output of your preamplifier to channel 1 input on the amplifier, remember to connect your right front speaker wires to channel 1's outputs. Always observe polarity when connecting speakers, connect amplifiers (+) to the speakers (+) and amplifiers(-)to speakers(-).

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 first, then the preamplifier. When turning equipment ‘on’, the preamplifier should always be turned onfirst, then the amplifier.Before turning anything on, ensure the preamplifier is at a low volume level.

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Troubleshooting

PROBLEM

 

POSSIBLE CAUSE

POSSIBLE SOLUTION

 

 

 

 

 

No sound

1.

Power cord not plugged in.

1.

Reconnect power cord.

(‘on’ LED not illuminated)

2.

Power off at AC source.

2.

Check AC switch or fuse.

 

3.

AC power inlet fuse blown

3.

Check for shorts or

 

 

or faulty.

 

overloading.

 

4.

Control switch in the wrong

4.

Place control switch in

 

 

position.

 

proper position. (Page 5)

 

 

 

 

 

No sound on some or all

1.

Speaker leads loose or

1.

Tighten, repair, or

selected channels (‘on’

 

faulty.

 

replace cable.

LED illuminated)

2.

Line stage to amp. cables

2.

Tighten, repair or replace

 

 

loose. or faulty.

 

cable.

 

3.

Source to line stage cables

3.

Tighten, repair or replace

 

 

loose or faulty.

 

cable.

 

4.

Line stage or source not

4.

Check all switch settings.

 

 

correctly selected.

 

 

 

 

 

 

 

Sound lacks direction,

1.

Speakers connected out of

1.

Check connections

bass weak

 

phase.

 

making sure that cables

 

 

 

 

are connected (+) to (+)

 

 

 

 

and (-)to(-).

 

 

 

 

 

Loud hum or buzz on one

1.

Poor ground connection in

1.

Check all connectors and

or more channels

 

interconnect cables.

 

repair as necessary.

 

 

 

 

 

Low output from amplifier

1.

Balanced switch in

1.

Put balanced switch in

 

 

balanced mode when using

 

correct position.

 

 

unbalanced inputs.

 

 

 

 

 

 

 

Channel sounds distorted

1.

Blown rail fuse.

1.

Replace blown rail fuse

and low in output

 

 

 

inside amplifier.

 

 

 

 

 

** Note: If unit continues to blow power inlet fuses,DO NOT USE A HEAVIER FUSE!!, have it serviced.

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.

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Reference 220M SPECIFICATIONS

Power rating: 8 ohms

250 watts @ 1 kHz

4 ohms

400 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

750

Current (peak to peak)

150 Amps

Slew rate

14 V / )sec

Dynamic headroom

1.4 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

350 watts max

 

4 Amps max current draw

 

85 watts @ no input

Replacement fuses

Line -12Amp/250 Volt Slow Blow

 

Rails - 6 Amp/250 Volt Slow Blow

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13005 rev 0004

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 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.

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 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.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 142271-800-543-5252or1-716-656-0023

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B&K Components, Ltd. 2100 Old Union Road Buffalo, New York 14227 716-656-0023www.bkcomp.com

13005 rev 0004