B&K ST140M Bedienungsanleitung

ST140M

Sin

le Channel Amplifier

OWNER’S MANUAL

B & K Components Ltd.

12999 rev 0005

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

Page 1 12999 rev 0005

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 2 12999 rev 0005

SAFETY PRECAUTIONS

PLEASE READ BEFORE INSTALLING

WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT

TO RAIN OR MOISTURE.

The li

htnin

flash with arrowhead, within an equilateral trian

le, is intended to alert the

user of the presence of uninsulated “dan

erous volta

e” within the product’s enclosure

that may be sufficient ma

nitude to constitute a risk of electric shock to you.

The exclamation point within an equilateral trian

le is intended to alert the user of the

presence of important operatin

and maintenance (servicin

) instructions in the

literature accompanyin

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 ST140M 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 ‘ratin

s’ are, contact your dealer.

Page 3 12999 rev 0005

The The ST140M's purpose and function

The ST140M 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 ST140M 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 ST140M 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 4 12999 rev 0005

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 Input

** OPTIONS AVAILABLE FOR THE ST140M AMPLIFIER

Rear panel description

1. AC fuse holder - Holds the AC Line fuse. This fuse is an 8 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.

5. RCA inputs- For connecting signal patch cables (interconnects) from the

preamplifier to the amplifier to pass signal.

Page 5 12999 rev 0005

6. Level controls - Option available for the ST140M 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 ST140M 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 ST140M. 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 6 12999 rev 0005

)LJXUH&

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 volta

e is for mutin

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.

Page 7 12999 rev 0005

)LJXUH'

Outputs

Five wa

bindin

posts are provided. One pair for each channel. The

are desi

ned to

accept a banana-t

pe plu

or spade lu

connector (shown below) and are color coded

for eas

identification. The red (+) post should alwa

s be connected to the speakers (+)

jack. The black (-) post should alwa

s be connected to the speakers (-) jack.

Spade connector Banana

ack

Here is a t

pical amplifier setup:

The ST140M amplifier has two sets of bindin

posts on it. The

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

ou can use the Channel 1 output to connect to

another speaker in parallel.

Page 8 12999 rev 0005

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 ST140M 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:

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