Fosi Audio HT4S Multi-Channel Amplifier

Name: Fosi Audio HT4S Amplifier
Brand: Dayton Audio
SKU: HT4S
Price: 139.99 EUR
Availability: InStock

Front panel of the Fosi Audio HT4S with volume knob

Rear panel of the HT4S with speaker and subwoofer outputs

Fosi Audio HT4S in 4.1 configuration for bass shakers

Remote control of the Fosi Audio HT4S amplifier

Bluetooth, AUX and optical inputs of the Fosi Audio HT4S

Fosi Audio HT4S amplifier for sim racing

Fosi Audio HT4S connected to several bass shakers

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The Fosi Audio HT4S is a multi-channel power amplifier with Bluetooth 5.0 and two TPA3116 chips that delivers up to 50 W per channel (4 Ω) in a 4.1 or 5.0 configuration, ideal for powering up to 5 bass shakers in your sim racing rig or for building a home cinema system.

It switches between 4.1 mode (30 W × 4 on the main channels + 60 W for the subwoofer) and 5.0 mode (30 W × 5 full range). It accepts Bluetooth 5.0, 3.5 mm AUX and optical inputs, and offers output to passive speakers and a subwoofer plus a 3.5 mm pre-out. It features a remote control, bass and treble adjustment and a multifunction knob with an LED indicator, all in a CNC aluminium body with a built-in power supply (AC 110-240 V) and measuring just 15.5 × 18.3 × 5.1 cm.

Fosi Audio HT4S key features

Bluetooth 5.0 + AUX + optical: connect phone, PC, TV or console with a stable link.
Dual TPA3116 chip: up to 50 W per channel (4 Ω) with clean sound and good separation.
4.1 / 5.0 switchable: 30 W × 4 + 60 W subwoofer, or 30 W × 5 full range.
Up to 5 bass shakers: immersive haptic feedback for your sim racing rig.
Full control: remote control and independent bass and treble adjustment.
CNC aluminium body: built-in power supply and compact design.

Technical specifications

Specification	Value
Channels	4.1 / 5.0 switchable (up to 5 outputs)
Amplifier chip	2 × TPA3116
Rated power	4.1: 30 W × 4 + 60 W (sub) @4 Ω · 5.0: 30 W × 5
Maximum power	50 W per channel (4 Ω)
Impedance	4-8 Ω
Inputs	Bluetooth 5.0 / 3.5 mm AUX / optical
Outputs	Passive speakers + subwoofer / 3.5 mm pre-out
SUB/CEN channel	FLAT (full range) or SUB (20-300 Hz)
SNR / THD	≥88 dB / ≤0.03 %
Power	AC 110-240 V (built-in supply)
Dimensions	15.5 × 18.3 × 5.1 cm
Material	Aluminium
Extras	Remote control, bass/treble adjustment

Compatibility

The HT4S can power up to 5 bass shakers rated 4-8 Ω, such as the Dayton Audio BST-1 or the Dayton Audio TT25-8 PUCK, plus passive speakers and a subwoofer. In 4.1 mode it reserves a boosted 60 W channel for the subwoofer or main shaker; in 5.0 mode it spreads 30 W across the five channels. It's a versatile base for haptic feedback in sim racing as well as for home cinema or multi-room systems.

Fosi Audio HT4S FAQ

How many bass shakers can it drive?

Up to 5 bass shakers rated 4-8 Ω, such as the Dayton Audio BST-1, BST-2 or TT25-8 PUCK, for immersive haptic feedback in your simulator.

How much power does it deliver?

30 W per channel rated power and up to 50 W maximum per channel at 4 Ω. In 4.1 mode, the fifth channel (subwoofer) delivers 60 W.

Which inputs and outputs does it have?

Bluetooth 5.0, 3.5 mm AUX and optical inputs. Outputs to passive speakers and a subwoofer, plus a 3.5 mm pre-out to connect an active subwoofer.

What's the difference between 4.1 and 5.0?

In 4.1 you have 4 main channels plus a boosted subwoofer channel. In 5.0, all five channels run full range at 30 W each.

Does it include a remote control?

Yes. It includes a remote control to adjust volume and set bass and treble, as well as the multifunction knob on the front panel.

Buying your amplifier from Simufy means buying with full guarantees

Official premium sim racing distributor in Spain and Portugal — over 70 brands
The only Official Fanatec out-of-warranty Repair Centre in Europe
Simucube Premium Reseller — one of only four in Europe
Shipping from our own 5,000 m² warehouse and Barcelona showroom
Specialised technical support and official warranty on every product
Tailored financing: leasing and renting available

Frequently Asked Questions

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