Mostly used in car audio systems, class D amps were once looked down upon in the home audio world. Class D used to mean small form factor, yet high distortion. These days Class D amps are much more refined, and it is not uncommon to see these, not only in powered subwoofers but also used as amplification for main power channels in a home theater or music system.

Parasound's Zamp Quattro is one such amp. This ultra compact two-zone amp measures just 9-1/2" wide and packs 4x50 watts at 8 ohms or 4x90 watts into 4 ohms, with all channels driven.

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Here is the press release:

The compact Parasound Zamp Quattro is just 9-1/2 inches wide and one rack space tall making it ideal for many varied custom installation solutions.

San Francisco (6/5/13) — Parasound has expanded its popular Z-Custom line of half-rack-width components with the introduction of the Zamp Quattro, a four-channel/two-zone power amplifier. The Zamp Quattro expands Parasound's "Zamp" amplifier concept with more channels, more power and more versatility.

"Parasound Zamps have been spec'd by custom installers for nearly 20 years" said Richard Schram, the president and founder of Parasound, "for their high quality sound and compact size. We expect installers will find creative uses for the Zamp Quattro. For example, four Zamp Quattros provides 16 channels of Parasound quality amplification in two rack spaces."

The Zamp Quattro retains rugged Parasound build quality and use of premium parts throughout as well as versatile turn-on, signal routing and hookup options. Unlike most Class D amplifiers for CI that are based on inexpensive car audio chips, the Zamp Quattro's Swedish Class D uses only high-grade parts. With additional output filtering the result is a great sounding amp that produces very little heat, is stable with low impedance loads and is protected from short-circuited speaker wires.

In addition to RCA line input jacks, it includes speaker-level inputs to integrate with receivers lacking pre-amp outputs. Channels 3 and 4 can be connected with RCA jacks or to a bus from Zone 1. Level controls are rear-mounted to avoid client tampering. Automatic turn on options include a 12-volt and an ultra-sensitive audio trigger. Speaker outputs are 10 amp terminal blocks for convenience when connecting speaker wires.

The Parasound Zamp Quattro is available in a black half-rack width rack-mount capability. Optional accessories are a matching blank panel to rack mount a single set, a panel coupler to rack mount any two Z-Custom models and the half-rack width Zrack to mount up to five Z-Custom components.

The Parasound Zamp Quattro Parasound four-channel power amplifier begins shipping to dealers this week. Its manufacturer's suggested retail price is $650.
If anyone can do Class D right, Parasound can. Anyone use a Class D amp in their home theater or music system?