Parasound Halo A21+ Stereo Power Amplifier
Parasound Halo A21+ Stereo Power Amplifier
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Parasound Halo A21+ Stereo Power Amplifier
“The A21+ represents a new unparalleled value in amplifier performance. It would be difficult get more amplifier without pursuing a home equity loan, or at least a small automobile loan.”
“The new Parasound was impossible to fault. Anyone in the market for a stereo power amp would be well advised to consider the Parasound A 21+, especially those who believe that they must spend more.”
“A very competent performer that I could easily live with for the rest of my natural days.”
A 300 W, high-bias class A and AB amp designed by John Curl. Can be bridged for 1,000 W mono.
With circuitry designed by the legendary John Curl, the Parasound Halo A21+ is a hugely powerful high-bias class-A with AB operation that delivers 60 A peak current per channel. It will drive even speakers whose loads dip below 1.5 Ohm. It has balanced inputs with discrete circuits, and the direct coupled signal path means no capacitors or inductors get in the way of great sound.
The Upscale View
Parasound is one of the industry's low-key, high-return brands. It's not always the first name on a customer's lips, yet is a hugely respected and loved brand by people who work in high-end audio. This isn't just because of the legendary John Curl who is behind most of its top-flight designs, but also because Parasound uses such expensive and solid engineering, yet is able to price its products so reasonably. Parasound is the brand of choice for someone who really knows good sound, but doesn't have the budget for audio jewellery.
The HALO Effect
The JFET input stage is connected to a MOSFET driver stage, and the amp uses 16 beta-matched 15 ampere, 60 MHz bipolar output transistors. The 71 lb. amp uses a 1.3 kVA shielded toroidal transformer with independent windings for each channel. There are independent power supplies for the input, driver, and output stages. The output stage uses 108,000 µF filter capacitors. Harris hyper-fast soft-recovery bridge diode rectifiers continue the theme of expensive, overspecified design that results in a sound with huge power and headroom. Full power is rated all the way down to 5Hz for unrestricted low-end bass
Features
- DC Servo and relay protection circuits
- AC turn-on inrush surge protection with relay bypass
- Automatic turn-on by 12 V trigger or audio sensing
- 4 rack space chassis with rear carry handles
- Rack mount hardware included
Specifications
Power Output (8, 4, 1 Ohm): 300 W, 500 W, 1,000 W
Inputs: Stereo RCA, stereo XLR, DC trigger
Input Impedance (Bal., SE): 66 kΩ, 33 kΩ
Gain: 29 dB
Dimensions (WHD): 17.63" x 7.13" x 20" (448 x 181 x 508 mm)
Weight: 71 lb. (32.2 kg)