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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3-year warranty

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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

A pre-order product is not yet available for immediate delivery, but it is on its way and can be reserved in advance before its official availability. This guarantees you will get the product as soon as it is in stock. We recommend pre-ordering to make sure you don't miss out on a unit and have to wait for the next batch.

Availability dates for pre-order products are shown on the corresponding product page and also in our #pre-orders channel on Discord: https://discord.gg/simufy

When a product is in stock, it is available in our warehouses and can be shipped immediately after you place your order.

Absolutely. The products we offer are carefully selected to meet high quality standards. This ensures that the materials used are durable, safe and suited to their intended purpose.

Check the product page. It usually shows a message indicating availability, such as "Ships immediately" or the number of units available. If the product is not in stock, one of these statuses is usually shown: - Sold out: no units are available and you may have to wait for a restock. - Pre-order: the product can be reserved before it arrives at our warehouse.

No, every order is sent as a single shipment. If an order contains both in-stock and out-of-stock items, it will ship as soon as all of its items are in stock. If you want to receive the in-stock items right away, you will need to place separate orders or ask us to charge an additional shipping fee.

VISA or Mastercard credit cards, PayPal, Aplazame, Klarna or bank transfer.

Simufy gives every customer the option to defer payment for any or all of their orders through the financing providers Aplazame or Klarna.

Klarna offers financing for orders of up to €1,500, in up to 3 interest-free instalments.

Aplazame offers financing for orders of up to €3,000, in up to 24 instalments with interest. The down payment and subsequent instalments are fully flexible and up to you.

Yes, as long as the product is received in the same condition in which it was shipped. The refund will be issued after the returned product has been manually inspected and approved, using the same payment method used for the purchase. For more information, see our Returns Policy.