The Fosi Audio HT4S is a compact integrated power amplifier with 5 channels capable of delivering 30W each thanks to two TPA3116 amplifier chips.

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For even more flexibility, the HT4S can alternate between 5.0 and 4.1 modes, allowing you to use it in a full-range 5-speaker configuration or reserve one of the channels for a passive subwoofer. In addition, the HT4S has a pre-out so you can connect an active subwoofer and enjoy a 5.1 surround configuration.

Finally, for even more versatility, the HT4S offers a Bluetooth input in addition to a Toslink optical input and a 3.5mm auxiliary input. As an aesthetic touch, the light strip on the front of the unit changes color depending on the input in use: blue for Bluetooth, orange for the auxiliary input, and red for the optical input.

Fosi Audio HT4S Specifications:
- Product Type: 5-Channel Integrated Amplifier
- Amplification type: Class D
- Gain ICs: 2x TPA3116
- Number of channels: 5.0/4.1
- Inputs: 1x Aux Jack 3.5mm/1x Optical Toslink/Bluetooth
- Outputs: 1x pre-out/5x speaker terminals
- Output power: 5.0: 5x30W 4 Ohm/4.1: 4x30W + 1x60W 4 Ohm
- Output impedance: 4-8 Ohm
- Crosstalk: 79 dB
- Total Harmonic Distortion (THD): 0.03%
- Signal to Noise Ratio (SNR): 88 dB
- Dynamic range: 89 dB
- Noise floor: 350 µV
- Frequency response: 20 Hz – 20 kHz (±0.5 dB)
- Power voltage: 110 – 240 VAC
- Dimensions: 284 x 178 x 100 mm
- Weight: 1.8 kg
- Black color
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