Bose PM4250 EU (CONFIGURABLE PRO AMP)

Description

Key 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. The amplifier
is capable of driving both low impedance and 70/100V
loudspeaker loads directly.
• 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). 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/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

Designed for a wide range of applications, including:
• Houses of worship
• Retail stores
• Atriums and malls
• Restaurants
• Auxiliary zones
• Conference centers
• Hospitality venues

Technical Specifications

Power Rating
THD for Power Rating, Typical
2 Ω 4 Ω 8 Ω 70 V 100 V
< 0.1 % < 0.1 % < 0.1 % 1 % 1 %
Mono Mode 250 W 250 W 250 W See footnote 3 See footnote 3
V-Bridge Mode 250 W2 500 W 500 W 400 W 500 W
I-Share Mode 500 W 250 W2 150 W2 Not available Not available
Quad Mode 1000 W2 1000 W 500 W2 800 W 1000 W
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 / Quad modes)
Audio Performance Specifications
Frequency Response 20 Hz – 20 kHz (at 1 W and +/- 0.5 dB)
Signal-to-Noise Ratio, Analog Input > 99 dB (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 amplifier output)
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, 2-band RoomMatch® array EQ
Maximum Output Delay 3 s
Output Limiter Peak and RMS voltage
Audio Inputs
Input Channels
Analog Digital (Optional Card)
4 (balanced line level) 4, selectable range
Input Impedance > 100 kΩ N/A
Sensitivity 0, +4, +12, +24 dBu, selectable Digital: 0, -12, -20, -24 dBFS, selectable
Maximum Input Level +24 dBu (at 24 dBu sensitivity setting) N/A
Connectors, Input 3-pin Phoenix Contact® (green color; part # 1776168) 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. 240 x 64 LCD. Additional controls available
w/ ControlSpace® Designer™ software
Electrical Specifications
Mains Voltage 100-240 V (50/60 Hz)
Mains Circuit Recommendation 15A (120 V) or 10A (230 V)
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, voltage limiter, 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) Shipping Weight: 30.0 lb (13.6 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 (Network version adds Ethernet RJ45)
Fault Notification Output NC/NO Relay Contact (1 A, 30 VDC), 3-pin Phoenix Contact® connector (orange color; part # 1976010)