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Parasound

Parasound Halo Series A-21+ Power Amplifier

Regular price $3,499.00 USD
Regular price Sale price $3,499.00 USD
Sale Sold out

 

For all Parasound Product, please contact us on lead time and availability.

A 21+




Changes from the original A 21→A 21+



    • 250 → 300 Watts (8Ω)

    • 400 → 500 Watts (4Ω)

    • 750 → 1000 Watts (bridged)

    • Filter cap: 88,000 uF → 108,000 uF

    • S/N: 112dB → 115 dB

    • THD (at full power): 0.2% → 0.1%

    • Crosstalk (20kHz): 63dB → 70dB

    • Transformer size: 1.2 kVA → 1.3 kVA

    • Weight: 60 LB → 71 LB

    • Refined Halo cosmetic with aluminum end caps & gold highlights

    • Updated rear panel with heavy duty speaker terminals from JC 5

    • Upgraded internal gold on gold audio connections

    • Updated auto turn on circuit


All Features



    • 300 watts x 2 @ 8 Ω RMS, both channels driven

    • 500 watts x 2 @ 4 Ω RMS, both channels driven

    • 1000 watts x 1 @ 8 Ω, in bridged mode

    • Circuitry designed by legendary John Curl

    • High bias Class A/AB operation

    • 60 amperes peak current per channel

    • Stable with speaker impedance dips to 1.5 Ω

    • Balanced inputs with discrete circuits

    • CHK Infinium, custom 5-way speaker binding posts

    • Gold-plated RCA input & loop output jacks

    • Direct-coupled signal path, no capacitors or inductors

    • DC Servo and relay protection circuits

    • AC turn-on inrush surge protection with relay bypass

    • JFET input stage, MOSFET driver stage

    • 16 beta-matched 15 ampere, 60 MHz bipolar output transistors

    • 1.3 kVA shielded toroid transformer w/ independent windings for each channel

    • Independent power supplies for input stage, driver stage and output stage

    • 108,000 µF filter capacitors for output stages

    • Full power is rated all the way down to 5Hz for unrestricted low-end bass

    • Harris hyper-fast soft-recovery bridge diode rectifiers

    • Automatic turn-on by 12 V trigger or audio sensing

    • 4 rack space chassis with rear carry handles

    • Rack mount hardware is included

    • Available in silver or black