Bose PowerMatch® PM4250
4-Channel Configurable Power Amplifier with Onboard DSP and USB Connectivity

OUR PART #  PM4250

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The Bose PowerMatch PM4250 configurable professional power amplifier provides concert-quality sound with a high level of scalability and configurability. The PM4250 offers multiple channel and power options, integrated audio DSP, front panel interface and USB connection. An expansion slot supports inputs from optional digital accessory cards. PowerMatch amplifiers utilize numerous Bose technologies to deliver an unprecedented combination of performance, efficiency, and ease of installation — all in a reliable, proprietary design. The PM4250 provides USB connection for single-unit setup and control using Bose ControlSpace® V3.0 or higher software.

QuadBridge Technology
Allows the 4 available channels to be configured as Mono, V-Bridge, I-Share or Quad mode, allowing the total available power of the amplifier to be allocated to one or more output channels. The amplifier is capable of driving both low impedance and 70/100V loudspeaker loads directly.

ControlSpace Designer Software
PowerMatch amplifiers can be fully configured using ControlSpace Designer software via the onboard front panel USB connection. Using ControlSpace Designer software you can access additional features including: Parametric EQ stages, load sweep of each output channel and auto standby. ControlSpace Designer software is also used to integrate network model PowerMatch amplifiers into larger control and monitoring systems comprised of Bose ESP processors and CC control centers.

Auto Standby/Wake Function
When enabled, this function automatically enters/exits Standby Mode, allowing the system to consume less power.

Dual Voltage and Current Feedback Loop
Proprietary design combines Class 'D' efficiency with a unique current and voltage feedback loop circuit that continuously monitors and controls both the current and voltage delivered to the loudspeaker load. Independent of power level and load impedance, the amplifier consistently delivers the widest possible dynamic range, frequency response and lowest possible distortion.

PeakBank Power Supply
Regenerative 4-quadrant power supply enables higher power density while allowing the reuse of energy from reactive loads that is normally wasted in conventional Class 'D' designs. This highly efficient amplifier design delivers sustainable and repeatable low frequency response.

Fast-Tracking Power Factor Correction (PFC)
Efficiently manages the current drawn from the AC mains, allowing the amplifier to drive loudspeakers to maximum output longer without power fluctuation. PFC provides superior transient response and functions at peak burst power much longer than conventional Class 'D' amplifier designs to satisfy the requirements of even the most demanding program material.

Bose PowerMatch PM4250 Specifications:

  • Power Rating:
    • THD for Power Rating, Typical:
      • 2 Ohms:  <0.1%
      • 4 Ohms:  <0.1%
      • 8 Ohms:  <0.1%
      • 70V:  1%
      • 100V:  1%
    • Mono Mode:
      • 2 Ohms:  250 Watts
      • 4 Ohms:  250 Watts
      • 8 Ohms:  250 Watts
      • 70V:  Limited use available. Tap 70V loudspeakers to 2x the desired power
      • 100V:  Limited use available. Tap 100V loudspeakers to 4x the desired power
    • V-Bridge Mode:
      • 2 Ohms:  250 Watts
      • 4 Ohms:  500 Watts
      • 8 Ohms:  500 Watts
      • 70V:  400 Watts
      • 100V:  500 Watts
    • I-Share Mode:
      • 2 Ohms:  500 Watts
      • 4 Ohms:  250 Watts
      • 8 Ohms:  150 Watts
      • 70V:  Not available
      • 100V:  Not available
    • Quad Mode:
      • 2 Ohms:  1000 Watts
      • 4 Ohms:  1000 Watts
      • 8 Ohms:  500 Watts
      • 70V:  800 Watts
      • 100V:  1000 Watts
    • Maximum Rated Power:  1000 Watts (250W x4 channels at 4 Ohms)
    • Peak output Voltage:  71 / 142 V (Mono / V-Bridge, I-Share, and Quad Mode)
    • Voltage Gain:  30 / 33 / 30 / 33dB (Mono / V-Bridge / I-Share / Quad Modes)
  • Audio Performance Specifications:
    • Frequency Response:  20 Hz - 20 kHz (at 1 W and ±0.5dB)
    • Signal-to-Noise Ratio, Analog Input:  >99dB (1dB below rated power, A-weighted)
    • THD:  <0.4% (at 1W, 20 Hz - 20 kHz)
    • Intermod Distortion (SMPTE):  <0.4% (60 Hz, 7 kHz)
    • Channel Separation (Crosstalk):  >65dB (adjacent channels, at 1 kHz)
    • Damping Factor:  >1000 (10-1000 Hz, 4 Ohms, at amplifier output)
  • Integrated DSP:
    • A/D and D/A Converters:  24-bit / 48 kHz
    • Total Latency (Analog In - Amp Out):  <0.95 ms
    • Input to Output Signal Routing:  4 x 4 matrix
    • Loudspeaker Presets:  Bose Professional
    • Input EQ:  5-band PEQ (±20dB), notch, shelving, high pass, low pass
    • Bandpass Filters (Crossover):  Butterworth, Bessel, or Linkwitz-Riley, up to 48dB/octave
    • Loudspeaker EQ:  9-band PEQ (±20dB), shelving, high pass, low pass, 2-band RoomMatch array EQ
    • Maximum Output Delay:  3 s
    • Output Limiter:  Peak and RMS voltage
  • Audio Inputs:
    • Analog:
      • Input Channels:  4 (balanced line level)
      • Input Impedance:  >100 kOhms
      • Sensitivity:  0, +4, +12, +24dBu, selectable
      • Maximum Input Level:  +24dBu (at 24dBu sensitivity setting)
      • Connectors, Input:  3-pin Phoenix Contact (green color; part# 1776168)
    • Digital (Optional Card):
      • Input Channels:  4, selectable range
      • Sensitivity:  0, -12, -20, -24dBFS, selectable
      • Connectors, Input:  Card dependent
  • Audio Outputs:
    • Output Channels:  1 to 4 (configurable)
    • Connectors, Output:  8-pin Phoenix Contact connectors (part# 1778120), supports 10-24 AWG wire
  • Indicators and Controls:
    • LED Status Indicators:  Signal, limit, clip, fault
    • User Interface Controls:  Mute, input sensitivity, output configuration, output attenuation, EQ on/off, preset select. 240x64 LCD. Additional controls available w/ ControlSpace Designer software
  • Electrical Specifications:
    • Mains Voltage:  100-240V (50/60 Hz)
    • Mains Circuit Recommendation:  15A (120V) or 10A (230V)
    • Mains Connector:  IEC 60320-C14 (Inlet)
    • Minimum AC Line Voltage:  80V (reduced output power)
    • Maximum Inrush Current:  15.4A (230 VAC, 50 Hz)
    • Maximum RMS Current Draw:  4 A
    • Efficiency, 1/3 Rated Power:  >66% (pink noise input signal)
    • Output Stage Topology:  Class 'D'
    • Overload Protection:  High temperature, DC, HF, short, voltage limiter, current limiter, inrush current, mains circuit breaker protection
  • Physical:
    • Dimensions (HxWxD):  3.5" x 19" x 20.7" (88 mm x 483 mm x 525 mm) - 2 rack space
    • Net Weight:  24.4 lbs (11.1 kg)
    • Mounting Depth:  21" (533 mm)
    • Operating Temperature:  32°F to 104°F (0°C to 40°C)
    • Cooling System:  Microprocessor-controlled, variable-speed fans, front to rear airflow

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