Bose PM4250

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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.
W
William RayAug 16, 2025
What to do if USB is connected to PC but Bose ControlSpace Designer software doesn't find the Amplifier?
- B
  Brian WilliamsAug 16, 2025
  If the ControlSpace Designer software isn't detecting your Bose Amplifier when connected via USB, try these steps: 1. Unplug and replug the USB connector. 2. Uninstall the ControlSpace Designer software, download the latest version, and reinstall it. 3. Restart your PC and try again. 4. Try a different USB port on your computer. 5. Try a different USB cable.
M
Matthew SpenceAug 20, 2025
Why isn't my Bose Amplifier found by ControlSpace Designer software over Ethernet?
- K
  Kevin WhiteheadAug 20, 2025
  If your PowerMatch Bose Amplifier isn't being found by the ControlSpace Designer software over the network, check the amplifier's IP address. Ensure no other device on the network has the same address and that ControlSpace Designer is connected to the same subnet as the amplifier. Try a different CAT5/6 cable. You can also launch a Windows Command prompt and "ping" the amplifier's IP address to check for successful replies.
N
Nicholas KruegerAug 25, 2025
Why does my Bose Amplifier sound unnatural?
- T
  tyler32Aug 26, 2025
  If the sound from your Bose Amplifier is unnatural, check that all DSP functions (EQs, Limiter, Band Pass, Delay) are set appropriately.
A
Anne Martinez MDAug 29, 2025
How to unlock the front panel of a Bose Amplifier if the combination is lost?
- S
  Stacy BrownAug 29, 2025
  To unlock the front panel of your Bose Amplifier when the combination is lost, use ControlSpace® Designer™ software to connect to the amplifier.

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

Summary

Introduction

Product Features

PowerMatch Amplifier Line Overview

Accessory Cards

Details on optional plug-in cards for expanded I/O flexibility.

Ideal for use with RoomMatch array module loudspeakers

Explains suitability for RoomMatch loudspeakers due to built-in EQs and power.

Interfacing with ControlSpace engineered sound processors

Describes advantages of using PowerMatch with Bose ControlSpace ESP processors.

Controls, Display, and Connectors

Hardware Installation

Unpacking

Lists items included in the product box for initial setup.

Rack Mounting

Provides guidelines for mounting the amplifier in a standard 19-inch rack.

Ventilation

Explains airflow requirements and fan operation for proper cooling.

AC Mains Outlet Requirements

Details AC power requirements and guidelines for optimal performance.

Making Connections

Connection and Configuration Steps

Outlines the procedure for setting up a PowerMatch amplifier for the first time.

Power (Mains) Connection

Describes how to connect the amplifier to the AC power source using the IEC cord.

Standby Mode

Explains how to enter and use Standby Mode for reduced power consumption.

Wiring Input Connectors

Wiring Output Connectors

Fault Notification Output

Serial over Ethernet

Setup and Configuration

Configuration Methods

Compares methods for configuring the amplifier: front panel, USB, and network.

Control Panel Description

Front Panel Control Menu Structure

Control Menu Descriptions

Setting the Limiting Function for use with 3 rd Party Loudspeakers

Sample Output Configurations for Different Loudspeaker Loads

Configuration of a RoomMatch Two-Module Array (Example 1)

Demonstrates connecting two RoomMatch array modules to a PowerMatch amplifier.

Configuration of a RoomMatch RMS215 Subwoofer Module (Example 2)

Shows connecting a subwoofer module to a PowerMatch amplifier.

Maintenance Operations

Updating Firmware and Speaker EQ Presets

Explains how to update amplifier firmware and loudspeaker EQ files.

Saving and Recalling Amplifier Settings (USB-only version amplifiers)

Saving and Recalling Amplifier Settings (network version amplifiers)

About the Alarm Log and Fault Indicator

Troubleshooting

Appendix

Interface Comparison Table

Compares functionality available on the front panel versus ControlSpace Designer software.

Technical Specifications - Common to all PowerMatch models

Technical Specifications - PM8500 PM8500 N

Technical Specifications - PM8250 PM8250 N

Technical Specifications - PM4500 PM4500 N

Technical Specifications - PM4250 PM4250 N

AC Current Draw and Thermal Dissipation Information

PM8500 PM8500 N, AC Current Draw and Thermal Dissipation

Provides data on current draw and heat output for PM8500/PM8500N models.

PM8250 PM8250 N, AC Current Draw and Thermal Dissipation

Provides data on current draw and heat output for PM8250/PM8250N models.

PM4250 PM4250 N, AC Current Draw and Thermal Dissipation

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