The Fosi Audio HT4S delivers integrated DAC and multi-channel amplification in a compact form factor, supporting switchable 4.1 or 5.0 channel configurations with up to five speaker outputs. Bluetooth, AUX, and Optical digital inputs accommodate diverse source components, while pre-out connectivity enables system expansion. This amplifier excels in versatile applications—from outdoor patios and commercial venues to home theater and desktop audio setups. The integrated bass boost circuit pairs exceptionally well with bass shakers for immersive sim racing and cinematic experiences, adding tactile dimension to gaming and film content. Intuitive controls include a multifunctional central knob for volume and mode selection, remote-accessible bass and treble adjustment, and LED mode indicators. The precision-engineered aluminum chassis with CNC unibody construction and sandblasted finish reflects meticulous craftsmanship. Built-in power supply and 24-month warranty complete this versatile amplification solution for demanding multi-channel applications.