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Electro-Voice Q44-II
Power Amp, 2 x 450W @ 4 ohms


While many people understand there are tremendous differences between professional loudspeakers...
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Our Price: $749.00
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Electro-Voice Q44-II
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While many people understand there are tremendous differences between professional loudspeakers, many also tend to think that amplifiers are only differentiated by the amount of output power they provide. Electro-Voice amplifiers serve to prove that there are also audible differences.

Dynamic Headroom
Amplifier power and distortion figures are typically specified with sine wave signals. However, music signals are far more dynamics than sine waves, comprising a pulsed wideband spectrum.

EV believes that, above all figures, the tonal performance of live music counts most; therefore, all of their amplifiers are designed for dynamic headroom. This means that each and every EV amp has at least 30% more output capability for short-term signals, when compared to a long-term sine wave value. This additional headroom results in an amp that will, for example, allow for short term signal peaks of at least 780W when spec'd 600W.

While dynamic headroom is audible when playing music through a sound system, another specification to observe is the increase in output power from an 8 ohm load to 4 ohms, and then down to 2 ohms. Of course, all Electro-Voice amplifiers are designed to be absolutely stable into loads of 2 ohms.

Transient Response
When processing dynamic signals, other important criteria are signal speed and dynamic distortion. For example, kick drum signals carry pulses of many frequencies as an overlay spectrum. Therefore, and in contrast to many other manufacturers, EV specifies a lot more information on their amplifiers' dynamic behavior than just "slew rate" figures. Important tests referring to the amp's ability regarding multitone signal pulses are expressed by IMD-SMPTE measurements at high power levels. And, while IMD tests show the Intermodulation Distortion behaviour (how much "sound" is added by the ampifier), DIM30 is the real spec for speed in an amplifier. All these tests are carried out in EV labs during an amplifier's design phase, to ensure maximum sonic performance. While these technical explanations appear very complex, they are clearly audible. Take a Q Series amplifier and crank it up - you'll hear the difference immediately.

Protection Package & Dynamic Limiter
There are many good-sounding amplifiers available; however, for an amp to be considered the world's best requires unparalleled reliability in real-world applications.

Q Series amplifiers benefit from decades of professional amplifier design, and all the expertise that has made EV amps the concert/touring standard is built into Q Series. Our complete protection package includes sophisticated circuits against overheating, short circuit, DC output voltage, HF oscillation, back EMF (Electromotive Force), and destructive peak current.

Furthermore, Q Series amps also protect your valuable loudspeakers with built-in dynamic limiters, preventing dangerous output clipping. The limiters immediately reduce amp gain when dynamic headroom is pushed to the limits at maximum output, keeping distortion below 1% in a situation that can otherwise cause a signal to clip, which is often fatal for woofers and drivers.

Q-Series Amplifiers & Connectivity
Whatever application you choose, you can be sure your Q Series amp is prepared:

  • Both inputs have a paralleled loop thru XLR output toroute signal to other amp inputs
  • Besides the usual channel A & B outputs viaSpeakon connectors (on pin 1+/1-), output A carries the signal of channel B aswell (on pin 2+/2-), providing an easy drive option for biamped speakers
  • Parallel & Bridge Mode option switches provideadditional functionality with minimized cabling requirements
  • An additional switchable LPN (Low-Pass Notch) filter provides extra tonalfundament and kick, with protective Low-Cut for using smaller passive 12" or15" cabinets without additional subwoofers

Electro-Voice Q44-II Specifications:

  • Maximum Midband Output Power (THD=1%, 1kHz, dual channel):
    • 650W @ 2ohm
    • 450W @ 4 ohms
    • 270W @ 8 ohms
  • Rated Output Power (THD <0.1%, 20Hz-20kHz):
    • 400W @ 4 ohms
    • 200W @ 8 ohms
  • Maximum Single Channel Output Power, Dynamic-Headroom, IHF-A:
    • 1150W @ 2ohms
    • 660W @ 4 ohms
    • 350W @ 8 ohms
  • Maximum Single Channel Output Power, Continuous, 1kHz:
    • 850W @ 2ohms
    • 540W @ 4 ohms
    • 310W @ 8 ohms
  • Maximum Bridged Output Power, THD=1%, 1kHz:
    • 1300W @ 4 ohms
    • 900W @ 8 ohms
  • Maximum RMS Voltage Swing, THD=1%, 1kHz: 55.3V
  • Power Bandwidth THD=1%, ref. 1kHz, half power @ 4ohms: 10Hz-30kHz
  • Voltage Gain, ref. 1kHz: 32.0 dB
  • Input Sensitivity, rated power @ 8 ohms, 1kHz:+2.2dBu
  • THD at rated output power, MBW = 80kHz, 1kHz:<0.03%
  • IMD-SMPTE, 60Hz, 7kHz: <0.1%
  • DIM30, 3.15kHz, 15kHz: <0.05%
  • Maximum Input Level: +21 dBu (8.69Vrms)
  • Crosstalk, ref. 1kHz, at rated output power:<-80dB
  • Frequency Response, ref. 1kHz: 10Hz-40kHz (+/-1dB)
  • Input Impedance, active balanced: 20kohms
  • Damping Factor, 1kHz: >300
  • Slew Rate: 25V/µs
  • Signal to Noise Ratio Amplifier, A-weighted:>106dB
  • Output Noise, A-weighted: <-71dBu
  • Output Stage Topology: Class AB
  • Power Consumption 1/8 maximum output power @ 4 ohms:550W
  • Power Requirements: 240V, 230V, 120V or 100V;50Hz/60Hz (factory configured)
  • Protection: Audio limiters, high temperature, DC, HF,Back-EMF, Peak current limiters, Inrush current limiters, Turn-on delay
  • Cooling: Front-to-rear, 3-stage-fans
  • Ambient Temperature Limits: 40°-105°F
  • Signal Processing: LPN, switchable
  • Safety Class: I
  • Dimensions (W x H x D): 483 x 88.1 x 421.5 mm
  • Weight: 27.8 lbs

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