The A51 is perfect for any higher end multi-channel application, and will drive the most demanding of loads within a system - so it is perfect not only for very good quality custom installation in-wall systems, but obviously is equally sure footed with large floor-standers as well. The root of this adaptability is primarily it's 2.2 kVA encapsulated toroid power transformer with independent secondary windings for each channel, plus the A51's high bias class A/AB operation working in tandem with it's directly coupled design (there are no capacitors or inductors in signal path).
These elementary features provide the structure on which the amplifier can give the real performance that other manufacturer's put on paper - but rarely deliver, meaning that the Halo A51 is the only choice for those really wanting visceral and dynamic performance. This power and dynamism is quantifiable as the A51 can output between 250watts to 400watts per channel - this is a real world measurement as this is whilst all channels are being driven (20 Hz - 20 kHz - 60 amperes peak per channel). This high power and high current output performance delivers very flexible dynamic 'headroom', which is why the amplifier can be sublimely subtle when required, and unflinchingly severe when raw power is needed.
As you would expect the build quality and components used in the A51 are pretty much second to none. The seriousness of the amplifier can be seen externally with the casework - as the A51's 4u chassis is solidly constructed to the best standards and also has rear mounted carry handles (rack mounting adapter included for custom installation applications) for moving it's impressive footprint to where you need it.
The A51 features both balanced and unbalanced inputs (RCA's are gold plated) with a designated ground lift switch, and these high quality inputs are matched with heavy-duty 24k gold-plated 5-way speaker terminals on the output stage. Befitting of it's high end custom installation pedigree the A51 also features auto turn on and a reliably solid 12v trigger for integration with processors, pre-amps or control systems.
Controlled bass, doesn't add coloration to the sound, plenty of power to spare, quality build.
No
I was surprised to hear a noticeable improvement in the sound on my speakers. Two-channel music sounds close to live, and movies at home feel like they are in a theater. After hearing the amp in hindsight, I would have no problem paying full price for it. Highly recommended!
Founded in 1981, Parasound Products, Inc is a privately owned U.S. company based in San Francisco USA that specializes in making award winning high quality audio and home theatre components for critical listeners.Parasound products are used in many of the worlds foremost movie and recording studios and often out-perform much more expensive brands.Even Lucasfilm has honoured only one company - Parasound - with screen credits in Star Wars Episode I, Episode II and Episode III. Lucasfilm used Parasound amplifiers and surround controllers to revolutionize on-location sound. They've achieved such outstanding results that the need for expensive, time consuming post-production studio time has been nearly eliminated.
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