Fosi Audio BT20A Bluetooth Stereo Amplifier
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Fosi Audio BT20A Bluetooth Stereo Amplifier
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Shipping Information
We offer free worldwide shipping, except for certain regions such as Ukraine and Russia, where our services are currently unavailable.
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Customer Support
WhatsApp: +8613716612254
support@fosiaudio.com
Mon-Fri: 3:00 AM - 3:00 PM PST -
FAQ’s
If you have any questions, please refer here: FAQs
Product details
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100W X 2(4 ohms, 20 Hz - 20 kHz, 0.04% THD), comes with a 24V power supply. If your usage scenario is smaller, it can also drive larger speakers, such as those rated at 280 watts (8 ohms) and 320 watts (4 ohms). Please note that this is applicable only for passive speakers.
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Advanced circuitry design, built-in speakers protection circuit, best for bookshelf/computer/desktop/speakers in your home
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Small simple compact design but practical and powerful, Hi-Fi Bluetooth amplifier exclusively designed for the customers who pursue HiFi sound;
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Bluetooth 5.0 core, up to 33ft connection range guarantees low signal delay. No pop, no audible noise when Bluetooth connection is established;
Specifications
| Specifications | Details |
|---|---|
| Power supply range | 12v-24v |
| THD | ≤ 0.5% |
| Frequency Range | 20Hz - 20kHz (±1 dB) |
| SNR | ≥ 98dB |
| Input sensitivity | ≤ 280mV |
| Bluetooth transmission distance | 28ft |
| Terminating impedance | 2Ohm - 8Ohm |
| Output power | 100W + 100W |
| Input mode | Bluetooth and Analog |
| Bluetooth Name | Fosi Audio |
| Bluetooth chip | ATS2853 |
| Power supply | 24V 4.5A |
What‘s in the box？
| Item | Quantity |
|---|---|
| Amplifier | 1 |
| Power supply | 1 |
| AC power cord | 1 |
| User’s Manual | 1 |
Tips: The plug of the power adapter will match the country of your delivery address.
FAQs
Please read our FAQs page to find out more.
How to: Choose the right banana plug?
- Closed Screw Type. All Fosi amplifiers use standard-sized speaker terminals (4mm pins).
- Easy to wire up and solidly connect to amplifier and passive speaker.
- If they do not fit, use a little force to tighten the plugs.
- Fosi Audio Banana Plugs (Copper, Silver/Gold Plated): http://bit.ly/40Djq0U, https://bit.ly/3MkPL8t
- Please watch tutorial videos: https://youtu.be/6pYhoqDlvNw / https://youtu.be/RGvBgGAwS9k
How to Diagnose Power Supply Failure?
- The following situations may cause this issue
- Case 1: The LED on the power supply does not light up; Case 2: Amp/Preamp does not turn on; Case 3: When plugged into the Amp, both light on the amp & power supply start blinking; Case 4: Amp/Preamp make noise; Case 5: Sound shuts off by itself
- Possible solution
- Check if the power supply is illuminated when plugged into AC by itself.
Plug power supply into a different socket.
Test the adapter with a meter.
Try a different power supply (within a range of DC input).
Test the included power supply on other electrical equipment.
Please watch the tutorial video by clicking on the link provided. https://youtu.be/yCjygS03zTE
What are the differences in power outputs using the 32V and 48V power supplies?
- Using a more powerful power supply can help prevent distortion.
- Enables amplifier to drive larger, more powerful, or higher-impedance speakers.
What is a GaN?
- The GaN supply has a power output of 240W.
- Offers overload and over-temperature protection.
- The 48V 5A GaN power supply is also available on Amazon.
Finally got around to setting up this amp. I paired it with a cheap pair of Dual LE43PB outdoor speakers, a little speaker. Used a good speaker wire, 14g. They are 4-6 ohm speakers and I had to turn up the volume a bit to get the sound level I wanted (indoor listening level 50-60 dB) but the sound I got was remarkable spacious and full of depth. Far better than I expected! Super easy setup and Bluetooth connection, I haven't tried the RCA connectors. This is intended for patio use and for that purpose I think it will be great!
Great amp. Good sound, low noise.. enough volume. Compact, and well crafted. 100% satisfied
Wonderful little power amp. Need something small and simple to run some passive speakers? Look no further. Cheap and effective.
Wanted to replace a bunch of old sound stuff that was taking up too much space. This device is perfect. Pair it with my phone and I’ve got music or ball games while working in the garage
I have a pair of the smaller Advent speakers I purchased in the 1970's and was looking for an amp to drive them that would connect via Bluetooth. The Fosi Audio BT20A fit the bill perfectly. Tiny footprint but with plenty of power to drive the 4 ohm Advents and fill my living room with high quality sound. Simple design and paired easily with my phone. Reasonably priced. Highly recommend if you are in a similar situation.
This is a great amp for the price I paid.
Great performance! Crystal clear sound!
I bought this to use my outdoor speakers and they sound fantastic. Highly recommend as it makes it really nice to play music from my phone with Bluetooth when on my patio.
I plugged in my FOSI, stereo chord from Echo. Got the treble and base set. Driving Yamaha Outdoor speakers sounds great in my large workshop. Turn on my phone to send music via bluetooth snd it switches automatically!
Fosi Audio BT20A Bluetooth Stereo Amplifier
Fosi Audio BT20A Bluetooth Stereo Amplifier
Fosi Audio BT20A Bluetooth Stereo Amplifier
These amps are veey simple and robust to use. I have bought over 30 of these amps and installed in my customer homes and VRBO rental property's. They are great because when someone who is connected gets out of range for a given time, it opens itself up for the next user. There is no need to press a button to clear the last user and open it up for the next user. If you were already paired before, it is still in your settings to reconnect again.
I was able to connect this to my Klipsch KG2s and stream audio with ease. Setup and use are simple and I'm able to use my favorite reference speakers again!
Fosi Audio BT20A Bluetooth Stereo Amplifier
Fosi Audio BT20A Bluetooth Stereo Amplifier
Just wired up my Fosi amplifier on Sunday to two Bose outdoor speakers. Best sounding system I have had so far. The unit came quickly, was easy to connect, easy to pair my phone to and absolutely ROCKS my backyard! GREAT PRODUCT!
A complete surprise. Very powerful for its size. Bluetooth connected immediately. Very Satusfied.
Fosi Audio BT20A Bluetooth Stereo Amplifier
Sounds so clean and love the ease of use and small form factor.
Bought one for bedroom bookshelf speakers, not expecting too much for $80. I was amazed by their performance! I've since installed them all over our Yacht Club - Bar/Dining room/Galley/covered deck/Work Dock where any member can enjoy their own music at any time.
I have a screened porch and ran speakers both on the porch and out to the yard. I wanted something to play audio from the TV and to be able to play music from my phone. This was exactly what I was looking for. Works great and easy to set up. Small footprint as the power adapter is bigger than the unit itself, but this can be hidden. Bluetooth range is decent, maybe 40-50 feet before it starts to have trouble. The switch is great. TV plays on the speakers if it's on, Bluetooth takes priority automatically. And you can leave them switched on and the Bluetooth doesn't automatically connect, which is a positive feature, because you wouldn't want it connecting all the time anyway.
beautiful in its simplicity - amazing in its power
I’ve been using this as a Bluetooth amp for Yamaha 150 W outdoor speakers on my deck for 3 years with no problems whatsoever. Sound is clear and more than enough power to annoy the neighbors. You can’t beat it for the price.
This is written pre approaching Fosi for a replacement because the situation shouldn’t exist. Under 2 months old and already the power switch has failed, it’s a flimsy switch but in under 40 operations failed, So going to try to return it. Everything else about the amp in terms of sound, function has been great at the price point but when it comes to adding $10 to maybe use better pots and hardware I would rather have that than to deal with that than being without music for however long this takes
Shipping was fast and free
Amazing value and works great. It has a real quality feel to it.
Has been a great upgrade for me.
Can you please help the amp was never delivered I’ve already reached out and heard nothing
