The Parasound A21+ stereo power amplifier is a product that can bring your speakers to life. This stylish looking power amp is a wonderful way to upgrade your system to get more out of your speakers, which will no doubt give you a more enjoyable listening experience. 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 driven500 watts x 2, 4 Ω both channels driven Power Output – Bridged Mode (0.1% THD)1000 watts x 1, 8 ΩBridged 4 Ω operation is not recommendedPower measurement are at 120 VAC:0.1% THD, RMS continuous power,full audio band (20 Hz - 20 kHz) Current Capacity60 amps peak, per channel Slew Rate> 130 volts per microsecond Frequency Response5 Hz - 100 kHz, +0/-3 dB20 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 % TIMUnmeasurable Inter-channel Crosstalk> 80 dB at 1 kHz> 70 dB at 20 kHz Input ImpedanceUnbalanced: 33 kΩBalanced: 66 kΩ,(33 kΩ per leg) Total Gain29 dB Input Sensitivity for 28.28 V Output into 8 ΩUnbalanced: 1 VBalanced: 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 Requirements2 mV - 10 mV XLR Pin Identification1 = Ground (Shield)2 = Positive3 = Negative (Return) DimensionsWidth: 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 Weight71 lb. (32.2 kg) Shipping Weight88 lb. (39.9 kg) Power RequirementStandby: 1 WattIdle (no music playing): 160 WattsTypical Listening levels: 300 WattsMaximum: 1400 Watts
