Name: Fosi Audio HT4S 4.1/5.0 Channel 5x50W Max Amplifier
Brand: Fosi
SKU: HT4S
Price: 140.84 EUR
Availability: InStock

4.1 / 5.0 channel amplifier for tactile rigs

One compact amp for up to five bass shakers.

The Fosi Audio HT4S is a compact multi-channel amplifier that makes a lot of sense for sim racing tactile builds. Instead of stacking several small stereo amps, you get up to five passive speaker outputs in one clean unit. Rated output is 30W x4 + 60W x1 in 4.1 mode or 30W x5 in 5.0 mode, with max output up to 50W x5 @4 Ohm – a practical match for a five-channel Dayton BST-1 style shaker setup when tuned sensibly.

up to 5 shaker channels 50W x5 max @4 Ohm 30W x5 rated in 5.0 mode Bluetooth / AUX / Optical

Fosi Audio HT4S 5-channel amplifier - OCRacing

Fosi Audio HT4S rear speaker outputs - OCRacing

Why it matters for sim racing

Five shaker outputs without five separate amplifiers.

A good tactile setup is easier to tune when each effect zone has its own channel. The HT4S gives you a compact way to run front-left, front-right, rear-left, rear-right and a center/sub-style tactile channel from one amplifier. For rigs based around 4 Ohm 50W bass shakers such as Dayton BST-1, the 50W x5 max rating is exactly the kind of headroom that makes this unit attractive.

01Five independent zones

Use separate channels for pedals, seat left/right, backrest or chassis points instead of mixing everything into one vibration.

02BST-1 friendly power class

Dayton BST-1 is a 4 Ohm 50W shaker, so the HT4S sits in a useful power range for a five-shaker rig.

03Cleaner rig wiring

One amplifier, one mains cable and one front volume control is tidier than a stack of small amps.

04Useful for SimHub

Route PC audio/tactile output into the amp and tune each channel in software for road, kerbs, gear shifts and ABS.

Fosi Audio HT4S sim racing bass shaker amplifier use - OCRacing

Rated vs max output

Use the numbers correctly.

The HT4S is not magic, and it should not be sold as five channels of continuous 50W RMS. The useful specification is this: 4.1 mode is rated at 30W x4 + 60W x1, 5.0 mode is rated at 30W x5, and max output is 50W x5 @4 Ohm. For tactile use, that gives sensible headroom for 50W-class shakers while still keeping the setup compact.

30W x4 + 60W x1 rated

Rated output in 4.1 mode for speaker + sub style layouts.

30W x5 rated

Rated output in 5.0 channel mode for normal specification comparison.

50W x5 max @4 Ohm

The headline number for peak output and shaker headroom.

4-8 Ohm terminals

Match your shaker impedance and wiring before powering the rig.

Rear panel and routing

Enough outputs for a proper tactile map.

The rear panel gives you multiple passive speaker outputs, AUX input, optical input, Bluetooth antenna connection and pre-out. For sim racing, the important part is the channel layout: you can build a tactile map around several shaker positions instead of forcing one large shaker to do every effect.

speaker outputs 3.5 mm AUX Optical input 3.5 mm pre-out

Fosi Audio HT4S rear speaker outputs for multiple channels - OCRacing

Fosi Audio HT4S controls and remote overview - OCRacing

Front controls

Quick level control without digging through software.

The front panel gives you a large main knob plus tone controls. For tactile rigs, that physical master control is genuinely useful: you can turn the whole shaker system down for a quiet session, then bring it back up without changing every SimHub effect profile.

Should I run the SUB/CEN channel in SUB or FLAT mode?

For tactile use, choose the mode that matches your routing. SUB mode outputs a low-frequency signal for the SUB/CEN channel, while FLAT mode keeps that output full-range. In SimHub-style setups, keep the software effects controlled and avoid sending unnecessary high-frequency content to shakers.

Is this only for bass shakers?

No. It is also a normal compact 4.1 / 5.0 speaker amplifier with Bluetooth, AUX and optical inputs. The sim racing use is simply one of the strongest reasons to pick it.

Tactile setup workflow

Build the rig around channels, not chaos.

The HT4S is a neat starting point for a multi-shaker cockpit, but the final feel still depends on mounting, wiring and tuning. Keep each shaker mounted firmly, label every channel and start with conservative gain before increasing the effect strength.

1Plan five zones

Front left, front right, rear left, rear right and center/sub is a clean starting layout.

2Match impedance

Use suitable 4-8 Ohm shakers and avoid wiring that drops the load below the amplifier’s safe range.

3Mount rigidly

Seat plates, pedal plates and profile mounts transfer feedback much better than soft surfaces.

4Tune gradually

Start with lower gain, then separate road, kerb, shift and ABS effects until the rig feels detailed, not messy.

What’s in the box

Everything needed for the amplifier side.

The package includes the HT4S amplifier, power cord, Bluetooth antenna, 3.5 mm AUX cable, remote control and user manual. Bass shakers, speaker wire and shaker mounting hardware are selected separately based on your rig layout.

Fosi Audio HT4S package contents - OCRacing

Technical overview

Fosi Audio HT4S specifications.

Product	Fosi Audio HT4S 4.1 / 5.0 Channel Amplifier
SKU	HT4S
EAN	6976136960478
Amplifier modes	4.1 channel / 5.0 channel
Rated output, 4.1 mode	30W x4 + 60W x1 @4 Ohm
Rated output, 5.0 mode	30W x5
Max output	50W x5 @4 Ohm
Supported impedance	4-8 Ohm
Inputs	Bluetooth, 3.5 mm AUX, optical
Outputs	Passive speaker outputs, 3.5 mm pre-out
SNR	>= 88 dB
THD	<= 0.03%
SUB/CEN mode	FLAT full-range or SUB 20-300 Hz
Work voltage	AC 110V – 240V
Dimensions	approx. 155 x 183 x 51 mm
Included	Amplifier, power cord, Bluetooth antenna, 3.5 mm AUX cable, remote control, user manual
Not included	Bass shakers, speaker wire and shaker mounting hardware

One compact amp for up to five bass shakers.

Five shaker outputs without five separate amplifiers.

Use the numbers correctly.

Enough outputs for a proper tactile map.

Quick level control without digging through software.

Should I run the SUB/CEN channel in SUB or FLAT mode?

Is this only for bass shakers?

Build the rig around channels, not chaos.

Everything needed for the amplifier side.

Fosi Audio HT4S specifications.

Related products

Dayton Audio BST-1 Universal Mount for simracing rig

Cable management clips bolt-on

PremiumCord HQ 3.5mm Stereo Jack Extension Cable (3m)

Dayton TT25 mount

Fanatec CSL Pedals Dayton TT25 mount

Information

Account

Information

Terms & Policies