QSC Audio makes dozens of amplifiers and loud speakers for a variety of volume-boosting needs. Though the company's EX4000 is no longer in its current lineup, this amplifier is made to last as a professional-grade power amp, providing high power and efficiency despite requiring 50 percent less cooling and voltage than many standard models.
Generally
The QSC EX4000 amplifier provides 1,600 watts of output power a channel at 2 ohms and 800 watts a channel at 8 ohms. Distortion is less than 0.5 percent. A variable-speed fan keeps operations quiet and a built-in limiter lessens distortion. Also, the EX4000's thermal management system changes its fan speed to suit different heat exchanges, even reducing the gain to prevent overheating.
The unit weighs 69 lbs. and measures (W/H/D) 19-by-5.25-by-17.9 inches. Under normal operations, it requires less than 12 amps of power at 4 ohms per channel. At 2 ohms per channel, it requires 58 amps. It requires 100-, 120- or 240-volt power.
Specifically
The EX4000 protects itself from short-circuit, open circuit, ultrasonic and RF interruptions with its variable speed fan. Its has input ports for a barrier strip and XLR, as well as binding posts and Neutrik connectors for speakers. Different-colored LED lights (green, yellow and red) allow you to monitor power and temperature levels. It has an AC switch, two channels of gain knobs in the front, and a parallel/stereo/bridge switch in back.
More Features
The EX4000 has a damping factor of more than 200 and dynamic headroom of 3 decibels at 4 ohms. Noise level is 100 decibels below the standard output range of 20 Hz to 20 kHz. Input impedance is 10,000 balanced, 20,000 unbalanced. The system comes with a three-step output circuit for further heat control and less power consumption. It also has a parallel switch that also bridges with mono sound. Older-model signal processors are compatible with the rear panel architecture, as well as newer, computer-based sound applications.
Tags: channel ohms, less than, ohms channel