Parasound Model Halo A 21 Power Amplifier

Why Buy New is pleased to offer for sale, this superb Parasound Model Halo A 21 Power Amplifier.

It includes a power cable and it has been repackaged and will be shipped on a pallet  to ensure safe delivery.

This has been tested and is in full working order. It is sold with a 3 month warranty.

The cosmetic condition is excellent. There is a minor mark at the top of the unit. There are a couple of marks on the fascia. This has been highlighted in the last images

FREE national courier delivery.

Why Buy... from us?
Because all of our items go through a full inspection, get serviced (if required), PAT tested for electrical safety, deep cleaned and all come with a warranty. We are 100% committed to customer care and are always on hand pre or post-delivery for technical help and advice.

A 21 Amplifier

Halo

Introducing the A21, a powerhouse crafted with precision by the legendary John Curl. This marvel boasts THX Ultra2 certification and operates in high-bias Class A/AB mode. Its features include balanced inputs with discrete circuits and XLR connectors, ensuring pristine signal transmission. With a direct-coupled design free from capacitors or inductors in the signal path, the A21 delivers unparalleled clarity.

Equipped with a complementary MOSFET driver stage and JFET input stage, alongside 16 beta-matched 15 amp, 60 MHz bipolar output transistors, this amplifier ensures dynamic sound reproduction. Its 1.2 kVA encapsulated toroid power transformer, with independent secondary windings for each channel, guarantees stable power delivery.

With 88,000 µF power supply filter capacitance, DC servo, and relay protection circuits, the A21 prioritises performance and longevity. Indicators for AC presence, channel status, and high temperature provide peace of mind during operation. Its heavy-duty 24k gold-plated 5-way speaker terminals and RCA input jacks, along with a ground lift switch, demonstrate meticulous attention to detail.

Convenience is key with features like auto turn-on via 12v trigger or audio signal, and a 12v trigger out. Housed in a robust 4U chassis with carry handles and a rack mounting adapter included, the A21 combines power, precision, and convenience for the discerning audiophile.

Specifications:

• Continuous Power Output:
  250 watts RMS x 2, 20 Hz - 20 kHz, 8 Ω, all channels driven
  400 watts RMS x 2, 20 Hz - 20 kHz, 4 Ω, all channels driven
  750 watts RMS x 1, 20 Hz - 20 kHz, 8 Ω
• Current Capacity: 60 amperes peak per channel
• Power Bandwidth: 5 Hz - 100 kHz, +0/-3 dB at 1 watt
• Total Harmonic Distortion: < 0.2% at full power
• IM Distortion: Balanced 16 V rms: < 0.04%
• Slew Rate: 130 V/µsecond
• Dynamic Headroom: 1.5 dB
• Interchannel Crosstalk
  80 dB at 1 kH
  63 dB at 20 kHz
• Input Sensitivity: 1 V for 28.28 V, THX Reference Level
• Input Impedance:
  33 kΩ unbalanced
  66 kΩ balanced
• Signal-to-Noise Ratio (S/N Ratio): 112 dB, input shorted, IHF A-weighted
• Damping Factor: 1100 at 20 Hz
• Voltage: 110V - 120V
• Dimensions:
  44.45 cm w x 19.37 cm h x 50.8 cm d
  17.78 cm h without feet
• Net Weight: 27.22 kg