B&K Reference 125.2 Series II User Manual

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B

&K Components, Ltd.

User Manual

R

EFERENCE 125.2 S2

Two Channel Amplifier

13746 0604

Table of Contents

Questions and Answers:

D
Daniel HigginsJul 31, 2025
What to do if my B&K Reference 125.2 II Amplifier has no sound on some channels?
- C
  Christopher ReedJul 31, 2025
  If your B&K Amplifier has no sound on some or all selected channels, and the power LED is illuminated, here are a few things you can check: * Ensure speaker leads are tightly connected and in good condition; repair or replace if necessary. * Check the preamp to amp cables, and source to line stage cables, ensuring they are secure and in good working order. Replace or repair if needed. * Verify that the correct line stage or source is selected. * Inspect speaker fuses and replace any that are blown, using the same type and value. * If using RCA cables, make sure the balanced button is in the 'out' position to switch balanced inputs off.
M
Makayla CrossAug 6, 2025
Why does my B&K Reference 125.2 II sound distorted with low output?
- J
  Jamie DyerAug 7, 2025
  A distorted sound and low output from a channel on your B&K Amplifier may indicate a blown rail fuse. Warning: Replacing the rail fuse should be done with caution, as it can indicate a more significant underlying issue. Replace the fuse ONLY with the same type and value. If the fuses continue to blow, it's recommended to consult a qualified service professional because rail fuses require internal service.
C
Christopher BergAug 14, 2025
What causes loud hum or buzz on B&K Amplifier channels?
- T
  Theresa MillerAug 15, 2025
  A loud hum or buzz on one or more channels of your B&K Amplifier may be due to a poor ground connection in the interconnect cables. Inspect all connectors and repair them as needed.
D
David ChapmanAug 22, 2025
Why does my B&K Amplifier sound lack direction and have weak bass?
- E
  Elizabeth Wilson DDSAug 23, 2025
  If your B&K Amplifier's sound lacks direction and has weak bass, the issue might be that the speakers are connected out of phase. Check all connections to ensure that cables are connected (+) to (+) and (-) to (-).

B&K Reference 125.2 Series II Specifications

General

Type	Stereo Power Amplifier
Power Output	125 watts per channel into 8 ohms
Frequency Response	5Hz - 45kHz ±0.5dB
Total Harmonic Distortion	<0.09% at rated power
Signal to Noise Ratio	Greater than 95 dB

Summary

Safety Precautions

Installation Considerations

Guidance on safe installation practices to prevent hazards.

General Safety Warnings

Alerts regarding electrical shock, hearing loss, proper handling, and ventilation.

Servicing Conditions

Back Panel

Back Panel Components

Identifies and describes key ports and connectors on the rear panel.

Inputs

XLR Balanced Inputs

RCA Unbalanced Inputs

Input/Output Connections

RCA/XLR Connection Types

Speaker Output Connections

System Installation

Installation Planning and Cable Runs

Making Audio Connections

Troubleshooting

No Sound and Power Issues

Troubleshooting steps for when the amplifier does not power on or produce sound.

Sound Quality and Noise Issues

Addresses problems like weak bass, distortion, hum, and buzz.

Fuse and Service Issues

Guidance on blown fuses and when to consult a service professional.

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