Bose PM4250 User Manual

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PowerMatch

®

Conﬁgurable Professional Power Ampliﬁers

Installation and Operating Guide

PM8500 / PM8500N

PM8250 / PM8250N

PM4500 / PM4500N

PM4250 / PM4250N

Table of Contents

Questions and Answers:

J
Jacqueline PierceAug 3, 2025
How to troubleshoot a Bose Amplifier with no power?
- W
  Wendy ByrdAug 3, 2025
  To resolve a no power issue with your Bose Amplifier, first, turn on the power switch. The Clip, Limit, and Signal LEDs should light up for about 15 seconds, after which the amplifier should be ready. The LCD screen will display the firmware version for approximately 10 seconds, then switch to the operating screen. Also, check the power cable and ensure the retaining clip is secure, and verify the mains circuit.
A
Alexandra GonzalezAug 8, 2025
What to do if my Bose Amplifier has power but no sound?
- S
  Stephanie WolfAug 8, 2025
  If your Bose Amplifier has power but no sound, start by checking the LCD screen for output meter activity. If there's no signal, check the Input Meter screen for a signal. If there's still no signal, troubleshoot the source or cabling. Also, ensure that input and output signals are not muted, the Input Routing is configured properly, the Input Source is set to the correct signal type (analog or digital), the Output Attenuate is not set too low, the loudspeakers are correctly wired, the Output Configuration is correctly set, and Standby Mode is not active.
P
Paul GibsonAug 12, 2025
Why is the sound so low on my Bose PM4250 Amplifier?
- R
  rossjessicaAug 12, 2025
  If your Bose Amplifier has power, but the sound is low, verify the source level by monitoring the Input Meter. Also, ensure that Input Routing and Input Sensitivity are set for optimal gain. Then, check that Output Attenuate is not set too low, the loudspeakers are wired correctly, the Output Configuration is correct, and Limiting parameters are set properly.

Bose PM4250 Specifications

General

Channels	4
Power Output per Channel @ 4 Ohms	250 W
Input Channels	4
Output Channels	4
Weight	22 lb (10 kg)
Signal Processing	Yes, via ControlSpace Designer software
Network Control	Yes
Width	483 mm (19.0 in)
Signal to Noise Ratio	100 dB (below rated power, A-weighted)
Input Impedance	20k Ohms

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