These amps are the toughest, meanest amps you've ever seen. They're high-quality, high-wattage and built to withstand the sort of punishment normally reserved for air-raid bunkers. Mackie knows that amps are going to be pushed to the limit, so they built a series of amps that could take it. Top-flight sound, low price, great specs, and as solid as a tank. 1/4 and heavy-duty 5-way binding post outputs.Switchable low-pass subwoofer crossover, 63Hz/125Hz. Sweepable HF horn compensation (2kHz-6kHz) for compression drivers mounted on constant directivity horns. Sweepable L/R low-cut filters, 10Haz-170Hz. Built in limited w/defeat switch. Detented input controls calibrated in dB and volts. OL, signal present, and temperature LEDs. And heavy-duty 5-way binding post outputs.