Our sales line is open Saturdays 12pm-7pm ET. Give us a call at 888.653.1184.

QSC SPA4­100

Four-channel Energy Star amplifier delivering 100 watts RMS per channel into 4 or 8 ohms
MFR# SPA4-100
QSC SPA4­100
QSC SPA4­100 QSC SPA4­100 QSC SPA4­100
No interest if paid in full within 12 months Learn more
Special Order
Note: This item may not be returnable or could require a restocking fee. Contact one of our Audio Consultants for more details. Due to the special nature of this item, we order each unit fresh from the factory, exclusively for you! Lead times may vary so please chat, call or email for up-to-date inventory status.

The QSC SPA4­100 is a 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 70 V or 100 V direct drive mode providing up to 350 watts RMS into a 70 V or 100 V output; when in 70 V or 100 V mode the 80Hz high-pass 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 - bridging the outputs of the SPA4-100 will deliver up to 350 watts into 70V or 100V when bridged
  • Auto-Ramp provides quiet start-up 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 amplifiers can be mounted in 1 RU, 1/2 rack space, and their clever joining brackets enable easy under-table and wall-mounting

Additional Information

Condition New
Width 8.7 in
Height 1.7 in
Depth 9.5 in
Unit Weight 4 lb
Channels 4-Channel
Amp Wattage 100 W RMS Class D @ 4 and 8 Ohms
No one has written a review yet. Be the first!

Share Your Opinion

The best gear advice always comes from those who use it the most. That's where you come in! Let the pro audio world hear your voice with a review of the QSC SPA4­100. Once you submit your review, please check your email and verify your address to have it posted.

How do you rate this product?

Blog Posts

Have some questions about this item?

When it comes to getting the best gear, your tastes are probably pretty particular. Vintage King can help answer any and every question to help you make the right decisions for your sound. Fill out the form below and we'll be in contact with you shortly.

Free Shipping in the USA and 50% Off International Shipping! See terms.

* Required Fields