QSC SPA4-100

  • $960.00

The SPA4-100 four channel amplifier delivers 100 watts rms per channel into 4 or 8 ohms; the four channels can also be bridged in pairs, each pair providing up to 200 watts rms into 4 or 8 ohms. The SPA4-100 bridged pair channels can be switched into 70V or 100V direct drive mode providing up to 350 watts rms into a 70V or 100V output; when in 70V or 100V mode the 80Hz highpass filter is automatically engaged.


  • Up to 200 watts per channel into 4 and 8 ohms — the outputs of the SPA4-100 model are designed to provide up to 100 watts per channel into Low-Z loads.
  • ENERGY STAR® qualified amplifier - The ENERGY STAR qualified SPA amplifiers employ an efficient class-D design to conserve energy and reduce operational cost.
  • Bridgeable outputs for higher power — Bridgeable outputs for higher power - Bridging the outputs of the SPA4-100 will deliver up to 350 watts into 70V or 100V when bridged.
  • Auto-Ramp provides quiet startup and power-down — The ENERGY STAR auto-ramp circuitry ensures quiet and fast power up from standby and seamless power-down following 25 minutes of inactivity, dramatically reducing power consumption.
  • Rack-mountable 1U, half rack width enclosure — The SPA amplifers can be mounted in 1 RU, 1/2 rack space, and their clever joining brackets enable easy under-table and wall-mounting


  • Stereo Mode Watts Per Channel:
  • 8 Ohms Dynamic, Both Channels Driven: 100 W
  • 4 Ohms Dynamic, Both channels Driven: 100 W
  • Bridged Mode, Watts per Channel:
  • 8 Ohms & 4 Ohms: 200 W
  • 70V & 100V: 350 W
  • Signal to Noise (A-weighted, 20 Hz-20 kHz): >100 dB
  • Input Sensitivity: 1.23 Vrms (+4 dBu)
  • Maximum Voltage Gain: 25 dB
  • Output Circuitry: Class D
  • Input Impedance: >10 kO (balanced), >10 kO (unbalanced)
  • Maximum Input Level: 12.3V (+24 dBu)
  • Highpass FIlter: Switchable 80 Hz when Bridged in 70V & 100V
  • Front Panel Indicators: Power, per channel Signal, per channel Protect/Limit
  • Controls: 4 Ohms/8 Ohms/70V Bridge Highpass On/100V Bridged Highpass On per channel pair


(1) QSC SPA4-100 Power Amplifier
(1) Power Cable
(1) Quick Start Guide
(1) Connector Kit
(1) Rack Mount Ears
(1) Mounting Brackets

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