Parasound A31

Product Highlights:

• Power Output:

  • 250 watts x 3 channels at 8 ohms
  • 400 watts x 3 channels at 4 ohms
  • Delivers continuous RMS power from 20 Hz to 20 kHz, ensuring consistent performance across all frequencies

• Gain Control:

  • Adjustable gain allows for up to +6dB over THX Reference level, giving you the flexibility to fine-tune your audio output

• Inputs:

  • Equipped with both unbalanced RCA and balanced XLR inputs for versatile connectivity options

• Circuitry:

  • High bias Class A/AB operation designed by legendary audio engineer John Curl
  • Direct-coupled design eliminates capacitors and inductors in the signal path for the purest sound reproduction

• Precision Engineering:

  • Complementary MOSFET driver stage and JFET input stage for superior audio accuracy
  • 24 beta-matched 15 amp, 60 MHz bipolar output transistors provide reliable and powerful performance

• Power Supply:

  • Features a 1.5 kVA encapsulated toroid power transformer with independent secondary windings for each channel
  • 98,400 µF power supply filter capacitance ensures clean, stable power delivery

• Protection and Indicators:

  • DC Servo and relay protection circuits safeguard your system from faults
  • Includes indicators for AC presence, channel status, and high temperature to keep you informed of the amplifier’s operating condition

• Build Quality:

  • Heavy-duty 24k gold-plated 5-way speaker terminals ensure a secure and corrosion-resistant connection
  • Housed in a robust 4U chassis with carry handles and rack-mounting adapter for easy installation and durability

• Certifications and Compliance:

  • THX Ultra2 certified for theater-quality sound performance
  • Auto turn-on via 12V trigger or audio signal for convenience and energy efficiency

• Warranty:

  • Backed by Parasound’s 5-year parts and labor warranty (USA purchases only)

Technical Specifications:

• Current Capacity: 60 amperes peak per channel
• Slew Rate: Greater than 130 volts per microsecond
• Frequency Response: 5 Hz - 100 kHz, +0/-3 dB at 1 watt
• Total Harmonic Distortion (THD): Less than 0.2% at full power, less than 0.03% at typical listening levels
• IM Distortion: Less than 0.04%
• Transient Intermodulation Distortion (TIM): Unmeasurable
• Dynamic Headroom: Greater than 1.5 dB
• Interchannel Crosstalk: Greater than 78 dB at 1 kHz; greater than 63 dB at 20 kHz
• Input Impedance:
  • Unbalanced: 47k ohms
  • Balanced: 94k ohms
• Input Sensitivity for 28.28V Output into 8 ohms:
  • Unbalanced: 1V
  • Balanced: 1V per leg
• Signal-to-Noise Ratio (S/N):
  • Greater than 112 dB (IHF A-weighted, input shorted)
  • Greater than 102 dB (unweighted, input shorted)
• Damping Factor: Greater than 1100 at 20 Hz

Trigger Requirements:

• DC Trigger: +9 VDC to +12 VDC, 2 mA
• Audio Trigger: 50 mV AC - 250 mV AC

Dimensions:

• Width: 17-1/2" (445 mm)
• Panel Height: 7" (178 mm)
• Height with Feet: 7-5/8" (194 mm)
• Depth: 19-1/8" (485 mm)

Power Requirements:

• Standby: 1 watt
• Full Power into 4 ohms: 1800 watts