MIC input with front- and rear-panel connectors. Rear-panel AUX1 and AUX 2 inputs. Rear panel line-level output allows connection to another amplifier. 100V and 70V constant-voltage speaker outputs and 4-16 ohm constant-resistance speaker output. Commercial-grade toroidal transformers produce high performance audio on a wide range of frequencies with minimal noise and high fidelity, even at high volume. Intelligent limiter can reduce excess signal. Reliable protection against overload, short circuit, and power fluctuation for optimum reliability. Oversized heat sinks protect against overheating, protecting the amplifier’s working lif. Interrupt feature mutes AUX inputs when signal is detected on the MIC input -speed of restoration of AUX inputs may be adjusted from sharp to gradual. Phantom power available on mic input for condenser-type microphones.