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A21+ Stereo Power Amplifier
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Parasound

A21+ Stereo Power Amplifier

"A 21+´Â ¾ÚÇÁ ¼º´É¿¡¼­ ºñ±³ÇÒ ¼ö¾ø´Â »õ·Î¿î °¡Ä¡¸¦ ³ªÅ¸³À´Ï´Ù.

»ç¿îµå ½ºÅ×ÀÌÁö ±íÀÌ, ÃÊÁ¡ ¹× Áú°¨°ú °°Àº ¼¼ºÎ »çÇ×Àº A 21+°¡ A 21°ú ½ÇÁ¦ °Å¸®¸¦ µÎ´Â ºÎºÐÀÔ´Ï´Ù. A 21+´Â ¿¹¿ÜÀûÀÌ¸ç °æÀÌ·Î¿î ´À³¦À» Á¦°øÇÕ´Ï´Ù. . "

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

[SPECS]

  • Power Output – Stereo Mode (0.1% THD)
    300 watts x 2, 8 Ω both channels driven
    500 watts x 2, 4 Ω both channels driven
  • Power Output – Bridged Mode (0.1% THD)
    1000 watts x 1, 8 Ω
    Bridged 4 Ω operation is not recommended

    Power measurement are at 120 VAC:
    0.1% THD, RMS continuous power,
    full audio band (20 Hz - 20 kHz)
  • Current Capacity
    60 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)
    < 0.1 % at full power
    < 0.03 % at typical listening levels
  • IM Distortion
    < 0.04 %
  • TIM
    Unmeasurable
  • Inter-channel Crosstalk
    > 80 dB at 1 kHz
    > 70 dB at 20 kHz
  • Input Impedance
    Unbalanced: 33 kΩ 
    Balanced: 66 kΩ,(33 kΩ per leg)
  • Total Gain
    29 dB
  • Input Sensitivity for 28.28 V Output into 8 Ω
    Unbalanced: 1 V
    Balanced: 1 V per leg
  • S/N Ratio
    > 115 dB, input shorted, IHF A-weighted
    > 110 dB, input shorted, unweighted
  • Damping Factor
    > 1100 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: 17-5/8" (448 mm)
    Height without feet: 7-1/8" (181 mm)
    Height with feet: 7-3/4" " (197 mm)
    Depth: 20" (508 mm)
    Depth with cables: 21-1/2" (546 mm)
  • Net Weight
    71 lb. (32.2 kg)
  • Shipping Weight
    88 lb. (39.9 kg)
  • Power Requirement
    Standby: 1 Watt
    Idle (no music playing): 160 Watts 
    Typical Listening levels: 300 Watts
    Maximum: 1400 Watts
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