8

CONTROL TRIGGERS

A control (trigger) system is provided on the Reference 125.5 S2 or Reference 125.7 S2 amplifiers to allow remote switching of the amplifier's standby on/off feature. The control input is designed to operate with a source (trigger) of 5-24 volts DC. All B&K A/V processors and preamplifiers utilize control output triggers to easily integrate an amplifier into an audio system.

In addition, your amplifier has a control output circuit to allow control of an external device such as another power amplifier, projection screen, power strip, etc. The control output has the capability to source 10-12VDC @ 200 mA (on) or 0 VDC (off).

If more than one amplifier is being controlled, the control output may be extended to include each successive unit by simply connecting a 3.5mm (1/8”) mini-jack cable from the CTRL OUT connector of the first amplifier to the CTRL IN connector of next amp (commonly referred to as 'daisy chaining'). An example of how to con- nect two amplifiers is illustrated in the diagram below.

Daisy Chained Control I/O

C O N T R O L I / O

C O N T R O L I / O

Connects to

preamp control output

CONTROL IN ALLOWS AMPLIFIER OPERATION WHEN A 5-24V SIGNAL IS APPLIED WITH A 3.5mm MINI JACK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WER

 

 

 

 

 

 

 

BLE

 

 

 

 

NUOD

C T R L

 

 

 

WLOPO

LRTENA

I N

 

 

R

V

C

 

 

 

 

G

 

+12

 

12V

C T R L

 

 

E

 

 

 

EV

 

 

 

 

+

O U T

 

 

 

G

 

1 2 V D C

 

 

EL

 

NI

 

PI

2 0 0 m A

 

 

S

 

R

 

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTROL IN ALLOWS AMPLIFIER OPERATION WHEN A 5-24V SIGNAL IS APPLIED WITH A 3.5mm MINI JACK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WER

 

 

 

 

 

 

 

 

 

BLE

 

 

 

 

 

 

NUOD

C T R L

 

 

 

 

WLOPO

LRTENA

I N

 

 

 

R

V

C

 

 

 

 

 

 

G

 

+12

 

12V

C T R L

 

 

 

E

 

 

 

 

EV

 

 

 

 

+

O U T

 

 

 

 

G

 

1 2 V D C

 

 

 

EL

 

NI

 

PI

2 0 0 m A

 

 

 

S

 

R

 

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Daisy chain to other amplifiers

Rear view of first amplifier

with control I/O

Rear view of second

amplifier with control I/O

DO NOT POWER MOTORS WITH THE CONTROL OUT CIRCUIT!!!

If the control function is desired, each unit in the system must remain connected. The control is enabled when the 3.5mm jack is inserted into the CTRL IN. For more information on the amplifier's output status under vari- ous control conditions, refer to the table below.

*Note: The control input voltage is intended for standby on/off control only. For best amplifier operation, each amplifier is recommended to have its own source of AC power.

 

Operational Outline

 

 

 

 

 

Hardware (3.5mm)

@ CTRL IN

Output Status

@ CTRL OUT

 

 

 

 

Not Connected

No Voltage

Sound

+12V

 

 

 

 

Connected

No Voltage

No Sound

0V

 

 

 

 

Connected

Voltage

Sound

+12V

 

 

 

 

Page 10
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B&K 125.5 S2, 125.7 S2 user manual Control Triggers, Connects to Preamp control output

125.7 S2, 125.5 S2 specifications

The B&K 125.7 S2 and B&K 125.5 S2 are part of the renowned Bowers & Wilkins speaker series, celebrated for their exceptional audio quality and innovative technologies. These speaker models are designed for both audiophiles and casual listeners who crave an immersive sound experience in their home environments.

The B&K 125.7 S2 features a 3-way design, incorporating a 1-inch aluminum dome tweeter, a 5-inch Kevlar midrange driver, and two 7-inch paper bass drivers. This configuration ensures rich, detailed highs, a clear midrange, and powerful low frequencies, delivering a balanced sound signature that excels across various musical genres and listening scenarios. The speaker's frequency response ranges from 45 Hz to 20 kHz, providing a wide soundstage that captures both subtle nuances and dynamic peaks in audio playback.

Equipped with the latest Bowers & Wilkins technologies, the B&K 125.7 S2 utilizes the advanced Flowport technology, which minimizes turbulence and enhances bass output. This innovation allows for cleaner, more precise low-frequency reproduction, making it ideal for both music and movie soundtracks. Additionally, the tweeter's decoupled design reduces distortion, ensuring that high-frequency details are reproduced accurately.

On the other hand, the B&K 125.5 S2 is similarly built but features a slightly compact design, making it an excellent choice for smaller spaces or more discreet setups. It encompasses a 2-way configuration that includes a 1-inch aluminum dome tweeter paired with a 5-inch Kevlar midrange driver. While it lacks the additional bass drivers found in the 125.7 S2, the 125.5 S2 compensates with an impressive frequency response of 50 Hz to 20 kHz, delivering a punchy and engaging audio experience.

Both models are crafted with premium materials, including an elegantly finished cabinet that not only enhances their aesthetic appeal but also contributes to acoustic performance by minimizing resonance. Their versatility allows for easy integration into various audio systems, making them suitable for listening at home or setup in a dedicated home theater environment.

In conclusion, the B&K 125.7 S2 and B&K 125.5 S2 are exemplary audio solutions that reflect Bowers & Wilkins' commitment to quality and innovation. With their respective designs and advanced technologies, they provide audio enthusiasts with the clarity, depth, and precision needed for an exceptional listening experience.