TROUBLESHOOTING

 

9

 

 

 

 

 

 

PROBLEM

 

POSSIBLE CAUSE

 

POSSIBLE SOLUTION

 

 

 

 

 

 

 

No sound

1.

Power cord not plugged in.

1.

Reconnect power cord.

 

(power 'on' LED not illu-

2.

Power off at AC source.

2.

Check AC switch or fuse.

 

minated).

3. AC power inlet fuse blown or

3. Check for shorts or overloading.

 

 

faulty.

4. Supply Control IN with a 5-24 Volt

 

 

4.

Control voltage not activated.

DC supply (Page 8).

 

 

5.

Power switch in off position

5.

Push in power switch.

 

 

(out).

 

 

 

 

 

 

 

 

 

 

 

 

 

No sound on some or all

1.

Speaker leads loose or faulty.

1. Tighten, repair or replace cable.

 

selected channels

2.

Preamp to amp cables loose

2. Tighten, repair or replace cable.

 

(power 'on' LED illuminat-

or faulty.

3. Tighten, repair or replace cable.

 

ed).

3.

Source to line stage cables

4. Check all source settings.

 

 

loose or faulty.

5. Check all speaker fuses and replace

 

 

4.

Line stage or source not cor-

if blown. Replace fuse with same type

 

 

rectly selected.

and value.

 

 

5. Speaker fuse blown.

6.

Press balanced button to switch bal-

 

 

6.

Balanced button “in” when

anced inputs off (out position).

 

 

using RCA’s.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sound lacks direction

1.

Speakers connected out of

1.

Check all connections making sure

 

weak bass.

phase.

that cables are connected (+) to (+) and

 

 

 

 

(-) to (-).

 

 

 

 

 

 

 

 

 

 

 

 

 

Loud hum or buzz on

1.

Poor ground connection in

1.

Check all connectors and repair as

 

one or more channels.

inter-connect cables.

necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

Channel sounds

1.

Blown rail fuse.

1.

WARNING: Blown rail fuses can be

 

distorted and low output.

 

 

an indication of a larger problem.

 

 

 

 

Replace ONLY with same type and

 

 

 

 

value. If fuses continue to blow, con-

 

 

 

 

sult a service professional.

 

 

 

 

Rail fuses require internal service.

 

 

 

 

 

 

 

***Note: If unit continues to blow power fuses, DO NOT USE A HIGHER RATED FUSE, please con- tact customer service to have the unit serviced. When servicing fuses always disconnect AC power before replacing.

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 cloth to remove any dirt or dust that accumulates on it. Unplug the amplifier and be sure that it has completely powered down before cleaning. Do not let any liquid enter the amplifier through the vents in the top cover. LIQUIDS CONDUCT ELECTRICI- TY!!! You may clean the connectors on the back panel with isopropyl alcohol annually.

Page 10 Page 12
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B&K 125.7 S2, 125.5 S2 user manual Care and Cleaning, Troubleshooting
Page 10 Page 12

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.
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