For Sale Parasound A21+ Power Amplifier

Further Information

Sold- pending payment

A magnificent beast that needs no introduction. The Parasound A21+ is the very best in its class. This amp has served me well. Not used too often as I'm quite busy but drives speakers with ease and really let's you hear all the low mids a lot of lesser amplifiers simply cannot reproduce. Smoke free, pet free home, this lives in my custom rack the whole time. I love this amp and am only selling as I was lucky enough to be able to step up to the JC5. I can include the brand new power cord that came with the JC5 as I didn't need it. Also has rack mount accessories. I have the original box but it has been flattened for storage purposes. I will also be selling an Emotiva XPA5 once this goes and putting the funds into a Parasound A51+ for surround duties.

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