Separate fuse boards inside to protect input and output supplies from damage.
Tunnel state design to cool heat sinks confirms which force cooling inside with a special audio cutout feature in each channel which shuts down the audio in case of wrong wiring or short-circuit and handle the same for thirty minutes and automatic operations once all OK in real-time without resting the settings.
Separate volumes for all 4 channels with input, clip and protect led on front panel and output power mode switch on back panel.