4ch, 100w Compact Amplifier


Sale price$1,155.00
Only 3 units left


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


  • Power cable
  • Quick start guide
  • Connector kit
  • Rack mount ears
  • Mounting brackets


  • Up to 200W per channel into 4 and 8 Ω - the outputs of the SPA4-100 model are designed to provide up to 100W 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 - Bridging the outputs of the SPA4-100 will deliver up to 350W into 70V or 100V
  • 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 bemounted in 1U, 1/2 rack space, and their clever joining brackets enable easy under-table and wall-mounting


  • Signal to Noise (A weighted, 20 Hz - 20 kHz): > 100 dB
  • Input Sensitivity: 1.23 V rms (+4 dBu)
  • Maximum Voltage Gain: 25.0 dB
  • Ouput Circuitry: Class D
  • Frequency Response: 20 Hz - 20 kHz
  • Input Impedance: >10 kΩ (balanced), >10 kΩ (unbalanced)
  • Maximum Input Level: 12.3 V (+24 dBu)
  • Highpass Filter: Switchable 80 Hz when Bridged in 70 V and 100 V
  • Front Panel Indicators: Power, per channel Signal, per channel Protect / Limit
  • Dimensions (H x W x D): 1.7" x 8.7" x 9.5" (43 x 220 x 241 mm)
  • Weight: 4 lbs. (1.4 kg)
 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

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