Halo A21+
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
Accessories