Bose PM4250
4-Channel 1000-Watt Power Amplifier

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 for fixed installation sound reinforcement systems.PowerMatch amplifiers utilize numerous Bose technologies to deliver an unprecedented combination of performance, efficiency and ease of installation - all in a reliable, proprietary design.

Features:

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. V-Bridge and Quad modes can drive either low impedance or 70/100V loads.

Bose® ControlSpace® Designer™ software – PowerMatch amplifiers can be fully configured using ControlSpace Designer software via the onboard front panel USB connection, or the rear panel Ethernet connection (network models only - The PM4250 does NOT have ethernet). Using ControlSpace Designer software you can access additional features including: Parametric EQ stages, load sweep of each output channel and auto standby.

Auto-Standby/Auto-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 re-use 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.

Applications:

  • Houses of worship
  • Retail stores
  • Atriums and malls
  • Restaurants
  • Auxiliary zones
  • Conference centers
  • Hospitality venues

Specifications:

  • THD for Power Rating, Typical
    2 Ohms: <0.1%
    4 Ohms: <0.1%
    8Ohms: <0.1%
    70V: 1%
    100V: 1%
  • Mono Mode
    2/4/8/ Ohms: 250 Watts
  • V-Bridge Mode
    4 Ohms: 500 Watts
    8 Ohms: 500 Watts
    70V: 400Watts
    100V: 500 Watts
  • I-Share Mode
    2 Ohms: 500 Watts
  • Quad Mode
    4 Ohms: 1000 Watts
    70V: 800 Watts
    100V: 1000 Watts
  • Maximum Rated Power
    1000 Watts (250 Watts x 4 channels at 4 Ohms)
  • Maximum Rated Power  1000 W (250 W x 4 channels at 4 ohms)
  • Peak Output Voltage  71 / 142 V (Mono / V-Bridge, I-Share, and Quad modes)
  • Voltage Gain  30 / 33 / 30 / 33 dB (Mono / V-Bridge / I-Share / Quadmodes)

Audio Performance Specifications

  • Frequency Response:  20 Hz - 20 kHz (at 1 W and +/- 0.5 dB)
  • Signal-to-Noise Ratio, Analog Input:  > 99 dBA (1 dB below rated power, A-weighted)
  • THD:  < 0.4 % (at 1 W, 20 Hz to 20 kHz)
  • Intermod Distortion - SMPTE:  < 0.4 % (60 Hz, 7 kHz)
  • Channel Separation (Crosstalk):  > 65 dB (adjacent channels, at 1 kHz)
  • Damping Factor:  > 1000 (10-1000 Hz, 4 ohms, at amplifieroutput)

Integrated DSP

  • A/D and D/A Converters:  48 kHz / 24-bit
  • 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 (+/- 20 dB), notch, shelving, high pass, low pass
  • Bandpass Filters (Crossover):  Butterworth, Bessel, or Linkwitz-Riley, up to 48 dB/octave
  • Loudspeaker EQ:  9-band PEQ (+/- 20 dB), shelving, high pass, low pass
  • Array EQ Filters:  2-band RoomMatch® array EQ
  • Maximum Output Delay:  3 s
  • Output Limiter:  Peak and RMS voltage

Audio Inputs

  • Input Channels: 4 (balanced line level)
  • Input Impedance: > 100 k?  N/A
  • Sensitivity: 0, +4, +12, +24 dBu, selectable
  • Maximum Input Level: +24 dBu (at 24 dBu sensitivity setting)
  • Connectors, Input: 3-pin Phoenix Contact® (green color; part #1776168)

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, outputconfiguration, output attenuation, EQ on/off, preset select. 240 x 64 LCD.Additional controls available w/ ControlSpace® Designer™ software

Electrical Specifications

  • Mains Voltage  100-240 V (50/60 Hz)
  • Mains Connector  IEC 60320-C14 (Inlet)
  • Minimum AC Line Voltage  80 V (reduced output power)
  • Maximum Inrush Current  15.4 A (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, voltagelimiter, current limiter, inrush current, mains circuit breaker protection

Physical

  • Dimensions: 3.5" H x 19" W x 20.7" D (88 mm x 483 mm x 525 mm) - 2 rack space
  • Net Weight: 24.4 lb (11.1 kg)
  • Mounting Depth:  21" (533 mm)
  • Operating Temperature:  32 °F - 104 °F (0 °C - 40 °C)
  • Cooling System:  Microprocessor-controlled, variable-speed fans,front to rear airflow

General

  • Setup and Configuration Software:  ControlSpace® Designer™ software V3.2 or greater
  • PC Interface Connection:  USB
  • Fault Notification Output:  NC/NO Relay Contact (1 A, 30 VDC), 3-pinPhoenix Contact® connector (orange color; part # 1976010)

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