B&K ST1200 Manuel utilisateur

B & K Components Ltd.

P/N 12687

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 4

Rear panel view Page 4

Rear panel description Page 5

Control muting Page 5 - 6

Level controls Page 6

Inputs Page 7

Outputs Page 8

Internal Bus Page 9

Jumper description Page 9 - 10

Mono application Page 11

Bridged application Page 12

System installation Page 13

Making the connection Page 13 - 14

Troubleshooting Page 15

Care and cleaning Page 15

Specifications Page 16

Warranty Page 17

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 ST1200 series II 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 ST1200 series II 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 term versatile is

almost adequate to describe the variance of operational modes the ST1200 series II is

capable of providing. This is all accomplished through the simple placement of internal

jumpers and the paralleling or bridging of it’s outputs and/or linking multiple ST1200

series II’s.

Here is a listing for some of the many tasks it can be set up to perform:

&The most obvious function for the ST1200 series II is to take 2 separate

audio inputs, such as a stereo pair, and provide 2 separate amplified

outputs. Your ST1200 series II has arrived set up in this configuration.

&With the inputs buffered, a line output (OUT BUS) may be taken from

either the L BUS, R BUS, or L+R BUS and sent on to another amplifier.

This allows for linking of multiple amplifiers.

&Continuing its versatility, the ST1200 series II may be used mono to

provide one, medium current channel in order to drive a speaker requiring

more power.

&As a result of the ST1200 series II’s unique bus system, the input to the

left channel may be inverted thereby allowing the possibility of creating a

single high voltage (bridged) channel from one source, through the left

bus.

The ST1200 series II 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.

Page 4

- Efficient high current transformer for improved dynamics.

- More accurate and three dimensional reproduction of source

material.

- 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.

1. AC fuse holder 5. Line Level outputs

2. AC Input receptacle 6. RCA inputs

3. Speaker outputs 7. Level controls

4. Amplifier control muting input/output

Page 5

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 8.

4. Amplifier control muting input/output -

To provide remote switching of mute on/off of the amplifier.

Explained further on page 5.

5. Line level outputs - For connecting signal to another amplifier (daisy chaining).

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

preamplifier to the amplifier to pass signal.

7.Level controls - For adjusting the input level to the amplifier. Explained

further on page 6.

A control is provided on each ST1200 series II 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 ST1200 seriesII. 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

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. This is a rough adjustment for matching different driver

impedances. Any fine tuning should be done by the preamplifier.

Page 7

Example: When using 4 ohm and 8 ohm speakers together, the 4 ohm may sound

louder then 8 ohm at a given volume level. The level controls on the amplifier are used

to match the speakers volume level. Clockwise will increase the output. Counter

clockwise will decrease the output.

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 -

Here is a typical input setup:

You will notice the OUT BUS connections shown above. You may use these to connect

to another amplifier. The L BUS OUT carries the same signal as the L INPUT. The R

BUS OUT carries the same signal as the R INPUT. The L+R BUS OUT carries the

combined signal from the left and right inputs.

Page 8

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:

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