Fosi Audio HT4S Bluetooth Amplifier for Outdoor Speakers, 4 Channel Power Amp for Home Theater, Outdoor Gathering, 4.1/5.0 Ch Stereo Home Audio Receiver, Supports AUX/Optical Input with Remote Control
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Availability:
20 left in stock
Arrives
Oct 27 – Oct 28
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Features
- All-in-One Amp: A mini amplifier that integrates DAC and power amplification. This stereo amplifier supports up to 5 channels output, switchable between 4.1 and 5.0 channels. It features Bluetooth, AUX, and optical digital inputs, along with pre-out and support for up to 5 speaker outputs. Note: The HT4S is a stereo amplifier and does not support Dolby, DTS, or other multichannel surround sound modes
- Multi-Scenario Solution: Ideal for pairing with outdoor speakers or wall-mounted speakers, perfect for setting up 2 to 5-channel audio systems in environments like patios, cafes, restaurants, bars, etc. It can also serve as a home theater or desktop HiFi system amplifier, meeting your diverse needs from indoor to outdoor settings
- Enhanced Immersion: Take your sim racing and home theater experience to a whole new level! By pairing with bass shakers, its sufficient power output and bass boost help significantly enhance the realism of racing simulator games. When watching movies at home, the vibration feedback can also help you experience your movies in another dimension, making every movie feel more realistic like being in a cinema
- Effortless Operation: Featuring a comprehensive user-friendly design with a built-in power supply, accompanied by remote control, supporting bass and treble tone adjustment, a multifunctional central knob for volume control, powering on/off and mode switching, LED mode indicator ambient light, etc. Enjoying music has never been easier
- Elegant and Durable: Continuing Fosi Audio's tradition of an all-aluminum alloy body design, the CNC unibody construction and fine metal sandblasting process highlight a minimalist aesthetic
Description
The built-in power supply design achieves minimal footprint, and the front panel indicator light adds a sense of atmosphere; whether it is patio parties, or immersive movie watching, simulator racing, The HT4S integrated amplifier is your ideal choice. Providing sufficient power output and ensuring pure sound with great clarity and separation. Long press to power the device on/off, short press to switch input modes and volume adjustment. Adaptable to 5.0 or 4.1 channel audio setups indoors or outdoors. Allowing you to effortlessly restore the original sound when adjusted to the center position. In FLAT mode, the SUB/CEN channel outputs full-range audio signals, while in SUB mode, it outputs low-frequency signals from 20 to 300Hz. Input modes are color-coded for easy use: blue for Bluetooth, orange for AUX, and red for OPT, to enhance the intuitiveness of operation. Provides functions like device power on/off, input mode switching, one-touch mute, etc., offering greater convenience. Constructed with a full metal casing, CNC machined, finely sandblasted for a simple yet durable and rugged design. Guided by our mission of "Redefining HiFi with Unmatched Value", Fosi Audio continues to fuel its passion for the Hifi industry, ramp up R&D efforts, and co-create new HiFi equipment with users. We pledge to bring more amazing Hifi gear with high value for the price, innovative design, cutting-edge technology, and premium quality, to audiophiles worldwide.
Manufacturer: Fosi Audio
Brand: Fosi Audio
Number of Items: 1
Built-In Media: Fosi Audio HT4S; Power Cord; Bluetooth Antenna; 3.5mm Aux Cable; Remote Control
Model Number: HT4S
Mfr Part Number: HT4S
Unit Count: 1 Count
Warranty Description: 24-month manufacturer
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Oct 27 – Oct 28
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
TLDR: If you're looking for a beautifully built, excellent sounding bluetooth amp this is the one. It excels in audio clarity with little to no distortion at high realistic listening volumes, offers multiple audio input modes that you can select between with a convenient remote, and has the most output channels of any bluetooth amp for this price point. An absolute MUST BUY for any one in the market for a small nice amp. Right out of the gate, this new Fosi Audio bluetooth amp is absolutely amazing. The build quality and design are top notch given the price of this amp. Really hard to beat especially when compared to other similarly priced amps on Amazon. Rated at max power of 50watts per channel at 4ohms, this thing has enough power to realistically handle any speakers you throw at it given its use case. I tested these on my Wharfedale Evo 4.2 bookshelf speakers (these are no slouch!) and WOW what a difference in audio quality over my $1k Denon AVR for music. The DAC on this bluetooth amp is shockingly very clear and defined, definitely ideal for music. Added with the tone controls on the front of the amp, this amp is more versatile than ever. I've got 2 other models of Fosi Audio amps, and this is by-far superior to the other older models that I've got. It's got much better clarity and doesn't distort at higher volumes in comparison to the TB10D that I have. One of my favorite improvements over the previous model bluetooth amps from Fosi is that this new HT4S model has the ability to select your audio input mode. I can now swap between bluetooth on my phone for music and optical/aux in from the TV/Apple TV. On my older bluetooth amp from Fosi it was an on/off switch control and that was it. Both bluetooth and aux were active at the same time. So if I was watching something via the TV somebody else could bluetooth freely and play music over my TV audio which was very frustrating. With this new HT4S model that issue is now gone and the beautiful LED light bar on the front panel displays which audio mode you're currently in by changing colors.
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Reviewed in the United States on September 4, 2024 by Kenny Vannavong
Okay. Let me address the power. It is right at the cusp of being underpowered. But for my set up it is not. With my set up it is at the perfect level. Powering 4 Kicker KB6B’s it is just right for my patio pool area. PLENTY OF VOLUME. The speakers sound amazing and absolutely no distortion. I love the sound and the volume level. Could it be louder? Yes but it works perfectly with my set up and it is plenty loud. I have never needed more and been disappointed that it could not produce it. The ease of set up and the sound it produces is excellent. Crystal clear through all ranges. Plenty of power. No distortion. No issue with Bluetooth drop out. Have my outdoor TV connected by optical cable. Nice easy no frills set up. Combine this with an eq app if you need more out of the sound for your speakers but it is perfect with what I have. To my ears. No issues with the remote and my existing TV. Works great. I would highly recommended this amp for outdoor speakers and TV for a patio area. I love it.
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Reviewed in the United States on August 24, 2025 by Christopher
So I've had this unit a year now. On my cover deck and they use it for a TV and Bluetooth for my phone. I have four Polk audio out door speakers set up. The sound is crisp and clean. For the TV I have an optical connection. Sound is also crisp and clean. The only issue I have is the volume is limited. On a normal daily basis it's fine. Occasionally I'll be watching a broadcast of a sporting event that seems to have lower volume for the announcers and I just can't get this unit loud enough. I think that's the fault of the broadcast, not necessarily the unit. I didn't give it a five-star because of limited volume. For a small space such as my deck this is great. For larger spaces I would recommend Fosi but possibly a more powerful unit. Overall, I am very satisfied.
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Reviewed in the United States on August 2, 2026 by Richard S
Yes, it does work, and I only have two book shelf speakers and an active sub powered to it. Does 60 watts per channel meet my expectations? No, not really. There’s just not enough wattage for the book shelf speakers. I’ll probably use it for a year and then find another amp with a little more power.
Reviewed in the United States on February 2, 2026 by Mark M
I bought this to run 4 Bose Freespace 51 speakers on my patio. They are very evenly matched as far as power requirements go, this is 50 watts max power and 35 watts running power x4.( speakers are 50 watt) It sounds clear and clean and plenty loud for most times, though it could use a little more power. It has switchable sub/speaker channel also but not using it at the moment. It can handle either a passive or powered sub. It's a solid built unit and sounds Great! Recently had my speakers rebuilt by Bose and broke them in using this little amp, I think it's the best I've ever heard them sound. I've also found that using an audio cable from my laptop to the amp gets the best (pretty amazing) sound. Very happy with this amp and hope FOSIAUDIO decides to build a little more robust 4 channel amp for outdoor use. I'll be in for one!
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Reviewed in the United States on August 19, 2026 by David M
Great sound but not as loud as prev system. The volume dial does t have a low to loud indicator so it’s difficult to tell why the volume is low.
Reviewed in the United States on September 6, 2026 by Nelson
Just got this Bluetooth amplifier/receiver and I am beyond impressed. Setup was insanely easy — paired to my TV and phone within seconds — and the sound quality is on a totally different level. The clarity, bass response, and overall power this little unit puts out shocked me. It instantly upgraded my detached garage man cave and made movies and music feel immersive and clean. Bluetooth connection is rock solid with no drops, the controls are simple, and the build quality feels premium. I also love that it gives me the flexibility to run speakers without dealing with a huge bulky receiver. If you’re looking for a compact amp that delivers big performance, this is the one. Absolutely worth every penny — can’t believe I waited this long to get one!
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Reviewed in the United States on December 10, 2025 by Joshua
Bluetooth connects quickly and works fine. This amp will be used in my garage, and I have concern that there is no fan in the unit. We'll see how it does during the summer months. For now, I just have a couple of Klipsch SB2 bookshelf speakers. The sound is decent, base and treble are fine, but the volume is pretty "meh". At high volume there is little distortion, but my ears aren't what they used to be. The setup will be fine but I'll likely update the amp at some point. My speakers have a lot more capability than what this amp can provide. All in all, for the money, not a bad unit. Update…. I added a 2nd set of Klipsch SB2 speakers to the garage (now have 4/ SB2s). I also changed the speaker setting on my iPhone (duh). The amp performs quite well and we get great sound outside with the garage door open. Thinking about buying a 2nd unit for a couple of old school Cerwin Vegas we have in the house.
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Reviewed in the United States on February 23, 2025 by Rob&Glo