Parasound - A 23+ Stereo Power Amplifier

A 23+ Stereo Power Amplifier

Parasound A23
Halo Collection

Quick Specs

Type: Amplifier
Width: 17 1/4"
Height: 4 1/8"
Depth: 13 1/4"
Energy Star Rated: No

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by Parasound

Halo by Parasound, our premier product line, marks a new standard for sound and style. Every Halo model has earned an unprecedented number of rave reviews from the top critics in the audio / video industry.

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Changes from the original A 23 A 23+

125 160 Watts (8 )
225 240 Watts (4 )
400 500 Watts (bridged)
Filter cap: 40,000 uF 54,400 uF
Crosstalk (20kHz): 63dB 70dB
Transformer size: 1.0 kVA 1.1 kVA
Refined Halo cosmetic with aluminum end caps & gold highlights
Updated rear panel with heavy duty speaker terminals from HINT 6
Upgraded internal gold on gold audio connections
Updated auto turn on circuit

All Features

160 watts x 2 @ 8 RMS, both channels driven
240 watts x 2 @ 4 RMS, both channels driven
500 watts x 1 @ 8 , in bridged mode
Circuitry designed by legendary John Curl
High bias Class A/AB operation
45 amperes peak current per channel
Stable with speaker impedance dips below 2
Balanced inputs with discrete circuits
Heavy-duty 24k gold-plated 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
12 beta-matched 15 ampere, 60 MHz bipolar output transistors
1.1 kVA shielded toroid transformer w/ independent windings for each channel
Independent power supplies for input stage, driver stage and output stage
54,400 F 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
2 rack space chassis with rear carry handles
Rack mount hardware available separately
Available in silver or black

Power Output - Stereo Mode (0.06% THD)	160 watts x 2, 8 both channels driven 240 watts x 2, 4 both channels driven
Power Output - Stereo Mode (0.9% THD)	210 watts x 2, 8 both channels driven 300 watts x 2, 4 both channels driven
Power Output - Bridged Mode (0.06% THD)	500 watts x 1, 8 Bridged 4 operation is not recommended
Power Output - Bridged Mode (0.9% THD)	600 watts x 1, 8 Bridged 4 operation is not recommended *All Power measurement are at 120 VAC, RMS continuous power, full audio band (20 Hz - 20 kHz)
Current Capacity	45 amps peak, per channel
Slew Rate	> 130 volts per microsecond
Frequency Response	5 Hz - 100 kHz, +0/-3 dB 20 Hz - 20 kHz, +0/-0.25 dB
Total Harmonic Distortion (THD)	< 0.06 % at full power < 0.03 % at typical listening levels
IM Distortion	< 0.04 %
TIM	Unmeasurable
Inter-channel Crosstalk	> 85 dB at 1 kHz > 70 dB at 20 kHz
Input Impedance	Unbalanced: 33 k Balanced: 66 k ,(33 k per leg)
Total Gain	29 dB
Input Sensitivity for 28.28 V Out (8 Load)	Unbalanced: 1 V Balanced: 1 V per leg
S/N Ratio	> 112 dB, input shorted, IHF A-weighted > 107 dB, input shorted, unweighted
Damping Factor	> 800 at 20 Hz
DC Trigger Requirements	+9 Vdc to +12 Vdc, 5 mA
Audio Trigger Requirements	2 mV - 10 mV
XLR Pin Identification	1 = Ground (Shield) 2 = Positive 3 = Negative (Return)
Dimensions	Width: 17-1/4" (437 mm) Depth: 15"-1/4" (388 mm) Depth, with cables 17" (432 mm) Height, with feet: 4-1/8" (105 mm) Height, without feet: 3-1/2" (89 mm), 2U
Net Weight	27 lb. (12.2 kg)
Shipping Weight	34 lb. (14.4 kg)
Power Requirement	Standby: <1 Watt Idle (no music playing): 75 Watts Typical Listening levels: 125 Watts Maximum: 800 Watts 110-125 VAC 60 Hz or 220-250 VAC 50 Hz AC mains voltage is set on rear panel

Quick Specs

Appearance
Type: Amplifier
Dimensions
Width: 17 1/4"
Height: 4 1/8"
Depth: 13 1/4"
Features
Energy Star Rated: No

A 23+ Owner s Guide

Parasound Amp BTU Ratings

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