FEATURES: Heavy Duty 10 Gauge power and speaker wire Inputs. Built-in crossover filters for easy tuning! Choose between a fixed HPF at 90Hz or LPF at 90Hz + 45Hz Bass Boost or just turn it FLAT and use your external crossover or DSP settings. It also includes Variable Gain Control. Level controls are not for adjusting volume. They adjust the amount of signal that is coming into the amplifier from your signal source. TECHNOLOGY: A smart electronic 2-way protection circuit protects the amp if it gets too hot or if speakers fail causing a short! Focusing in sound quality, a full range response of 10 to 24,000Hz was used to give the best sound reproduction on this tiny amplifier. BRIDGEABLE: Double the power output to your speakers by bridging two channels. Minimum impedance of 4 Ohms per bridged channel at output power of 2 x 225 Watts RMS. POWER: This amplifier is designed to run your stereo system with the power it needs to perform! 500 Watts maximum dynamic RMS power output of 4x 125 Watts at 2 Ohms per channel. Its high efficiency rate of 87% provides more power with less battery consumption. COMPACT DESIGN: Digital class D Brazilian technology allows this amplifier to have a small footprint by integrating a high-speed mosfet power supply with top of line transistors to ensure performance in a small heat sink without compromising performance. Dimensions: 3.93 depth x 5.02" width x 2" height.