QSC SPA4-100



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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 ? dynamic, both channels driven 60 W 60 W 200 W 100 W
4 ? dynamic, both channels driven 60 W 60 W 200 W 100 W
Bridged Mode Watts per channel
8 ? & 4 ? 200 W 100 W continuous 400 W 200 W

70 V & 100 V

250 W 125 W 350 W 175 W*

Signal to Noise (A weighted, 20 Hz-20 kHz)

>100 dB >100 dB >100 dB >100 dB

Input Sensitivity

1.23 Vrms (+4 dBu) 1.23 Vrms (+4 dBu) 1.23 Vrms (+4 dBu) 1.23 Vrms (+4 dBu)

Maximum Voltage Gain

25.0 dB 25.0 dB 25.0 dB 25.0 dB

Ouput Circuitry

Class D Class D Class D Class D

Frequency Response (20 Hz - 20 kHz)

Frequency Response (20 Hz - 20 kHz)

Input Impedance

>10 k? (balanced), >10 k? (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


4?/8?/70V Bridge Highpass On/100V Bridged Highpass On per channel pair

Dimensions (HWD) inches

1.7 x 8.7 x 9.5 / 1RU

Dimensions (HWD) mm

43 x 220 x 241 / 1RU

Weight (Net)

3.5 lb / 1.6 kg 3.5 lb / 1.6 kg 4.0 lb / 1.4 kg 4.0 lb / 1.4 kg

Weight (Shipping)

6 lb / 2.3 kg 6 lb / 2.3 kg 6.5 lb / 2.5 kg 6.5 lb / 2.5 kg

Agency Approvals

UL, CE, ENERGY STAR, RoHS/WEEE compliant, FCC Class B (Conducted and Radiated emissions), UL 2043 witd PL-Kit

Carton Contents

Power cable, quick start guide, connector kit, rack mount ears, mounting brackets
*Peak Power 250 W

All specifications are subject to change without notice.

Synchrony Financial

Progressive Leasing

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