QSC offers a wide range of power amps -- from the affordable GX series, to the DSP-packed PLD series. Follow our buying guide to pick the perfect amp to power your passive PA system.
When you're choosing a power amp, the most important spec is its power output, measured in watts. To get the most of of your PA system, look at your loudspeakers' continuous/RMS power ratings (watts) and impedance ratings (ohms). Pick an amplifier that can deliver about twice the continuous/RMS wattage of your speakers. For example, the QSC E110 loudspeaker
has an impedance of 8 ohms, and is rated for 300 watts continuous power. To power a pair
of E110 speakers, you'd want an amp that can deliver 600 watts of amplifier power into 8 ohms on both channels, and the QSC PLX3102 power amp
would be a great choice.
To compare wattages/ohm resistance ratings, click the amp you're interested in and check out the "Specs" tab on the product's page.
PLX2 Series: Clean Audio for Pro Applications
The second generation of QSC's hit PLX series, PLX2 amplifiers provide an abundance of clean, undistorted output. To reduce crossover distortion, these amplifiers make precise modifications in response to temperature changes. In plain English, that means cleaner, more consistent sound -- no matter how hard you drive these amps. Compared to large, heavy AC transformers that provide 60 pulses per second, QSC's efficient, lightweight PowerLight supply delivers 100,000 pulses per second. These additional pulses assure your power supply doesn't drop -- so bass frequencies stay full while the highs remain crisp and clean.
QSC's PLX "02" models can drive up to four loudspeakers from each of two channels, with rear-panel switches for top, subwoofer, or full-range output. These amps are also ideal for extremely high-power bridge mono applications, with front-panel lights to indicate bridged mode operation. The higher-output models use QSC-exclusive Class H circuitry to increase power without affecting audio quality.
GX and GXD Series: Easy to Use, Great Value
Easy to use and reliable, QSC GX series amplifiers provide a straightforward solution for clean and portable power on a budget. These amps add the PowerLight supply to a Class H output section, giving them an excellent power-to-weight ratio. The GX series includes GuardRail limiting, which reduces gain during continuous clipping or overheating, protecting your speakers and preventing high distortion or shutdowns. GX series amps are available in lower wattages -- so they're a great fit for smaller PA systems that need reliable QSC power.
QSC's GXD power amps add higher wattage and powerful, easy-to-use built-in DSP, so you can set up and tune your PA system without an outboard loudspeaker processor. You have high-pass and low-pass filters, 4-band parametric EQ, delay up to 50 ms, and peak limiting -- all controllable from the front LCD screen. GXD amps let you customize, store and recall 20 presets for just about any application.
RMXa Series: An Update on a Live Sound Staple
Following in the footsteps of QSC's long-running RMX series, RMXa amplifiers offer rugged construction and clean, consistent power thanks to their high-current toroidal transformers and huge filter capacitance. QSC RMXa series amps keep your signal consistent by removing high-level transients, delivering low distortion and a flat frequency response. They're also available in a variety of wattages, so there's an RMXa amp for every size venue.
The outputs on each RMXa amp are directly mounted to the heat sink for improved thermal coupling and cooling. A full complementary output circuit using the highest-grade linear output devices delivers ultra-low distortion.
PLD Series: Powerful DSP Tools to Streamline Your Rig
QSC's PLD series amps do more than just power your speakers -- they provide cutting-edge DSP tools to tune your PA system, eliminating the need for outboard loudspeaker processors. Each PLD series amp can drive up to four channels, powering most any speaker configuration. Call up one of 20 factory presets from the Preset Wizard, then tweak and save your own settings for parametric EQ, alignment delay, crossover, and limiting with the amp's user-friendly interface and LCD screen.
There's a benefit to having all your PA system processing on board the power amplifier: the DSP can monitor and respond to the amplifier's behavior, making dynamics processing more accurate and effective on both RMS and peak limiting. The result is an exceptionally powerful, flexible, and efficient amplifier that's still light in weight.