I wanted this to drive a pair of ceiling speakers that would be connected via bluetooth to my google home mini that was in my kitchen. I have a 7 zone whole house audio system being driving off google home products (speakers, google chromecast audio's, receivers with chromecast built in etc). The amp worked just fine and the BT connection was reliable, but the problem was the BT connection introduced a lag. There's a setting buried in google home to adjust for BT lag, but the lag I got off the amp would change every time I'd change tracks or started a new playlist. I'd get the living room stereo running off a chromecast audio perfectly in sync with this Fosi amp and the google mini in the kitchen using a metronome track on spotify and then as soon as I'd stop and restart the track or play an actual song the two systems would be out of sync and causing an annoying echo. Sometimes they were off so much song lyrics were an entire word ahead. It wouldn't be an issue if you were only playing this one zone, but when it's multiple zones it completely unusable if one is playing out of sync.
In the end I just added another chromecast audio to this amp instead of trying to drive it with the google mini since they have a line out and it's been 100% in sync since. I don't blame the amp, which is why I still gave it a 5 star review, because doing more reading this seems like a common issue with any BT speaker connection and trying to sync it with other speakers. I've got the volume set at about 50% on the amp and it drives the ceiling speakers great, and at 1/2 volume on the amp adjusting the volume on the entire whole house system seems to stay mostly in step across the other zones. Too bad google killed the chromecast audio and no one has a similar product with a 3.5mm speaker out port.
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This Item  Fosi Audio BT10A-S Bluetooth 5.0 Stereo Audio Receiver Amplifier 100W TPA3116 2 Channel Mini Hi-Fi Class D Integrated Amp for Home Passive Speakers with Power Supply |  |  |  |  |  | |
| Price | -20% $39.99 Typical: $49.99 | $79.99 | $79.99 | -11% $79.99 List: $89.99 | -13% $69.99 List: $79.99 | $79.99 |
| Delivery | Get it as soon as Thursday, May 16 | Get it as soon as Thursday, May 16 | Get it as soon as Thursday, May 16 | Get it as soon as Thursday, May 16 | Get it as soon as Thursday, May 16 | Get it as soon as Thursday, May 16 |
| Customer Ratings | ||||||
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| Bluetooth connectivity | ||||||
| Sold By | Hifi Made Fun | Hifi Made Fun | Fosi Audio | Hifi Made Fun | Fosi Audio | Fosi Audio |
| number of channels | 2 | 2 | 2 | 2 | 2 | 2 |
| voltage | 110 volts of alternating current | 110 volts | 230 volts | 230 volts | 220 volts | 220 volts |
| mounting type | Surface Mount | — | — | Tabletop Mount | Surface Mount | — |
Product Description
Our Story
Fosi Audio was founded with a simple goal: Build products that sound great and make people want to listen to music every day. We design, manufacture, and sell many Hi-Fi audio products on the market. We pursue your perfect music journey. Enjoy Hi-Fi music with Fosi Audio audio products NOW!
Bluetooth 5.0 Mini Hi-Fi Amplifier
Product Parameters:
- Power Adapter: 19V/4.74A
- DC Input Range: 15-24V
- Terminating Impedance: 2 Ohm - 8 Ohm
- MAX Power Output: 50W x 2
- THD: ≤ 0.04%;
- Frequency Range: 20Hz - 20kHz (±1 dB)
- SNR: ≥ 98dB
- Input Sensitivity ≤ 280mV
- Input Mode: Bluetooth and 3.5mm AUX
- Bluetooth Transmission Distance: Up to 50ft(15m)
- 2 Channel Power Amp: BT10A, BT20A, TB10A, TB10D, V1.0B, V1.0G, TDA7498E, ZK-1002, ZK-502T.
- 2.1 Channel Power Amp: BT30D, BT30D Pro, BL20A, BL20C, ZK-TB21.
- DAC: Q4, K5 Pro, DS1, DS2. DAC Amplifier: PH04, DA2120A, DA2120C.
- Subwoofer Amp: TP-02, M01-BT, M02, M03, M04.
- Phono Preamp: BOX X1, BOX X2, BOX X3, BOX X4. Tube Preamp: P1.
- Tube Headphone Amplifier: T20, T20X, P2.
- Class AB Amplifier: T3.
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Bluetooth 5.0
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Bass and Treble Control
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2.0CH Class D Amp
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Mini but Powerful
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| BT10A-S | BT20A | BT20A-S | BT30D-S | BL20A | BL20C | |
| Customer Reviews |
789
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8,106
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590
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383
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582
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789
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| Price | $39.99 | $79.99 | $49.99 | $79.99 | $79.99 | $89.99 |
| Type | Bluetooth 2.0 CH Amp | Bluetooth 2.0 CH Amp | Bluetooth 2.0 CH Amp | Bluetooth 2.1 CH Amp | Bluetooth 2.1 CH Amp with Remote Control | Bluetooth 2.1 CH Amp |
| MAX Power Output | 50W x 2 | 100W x 2 | 100W x 2 | 50W x 2+100W | 100W x 2 | 160W x 2 |
| Input | Bluetooth + 3.5mm AUX | Bluetooth + RCA | Bluetooth + RCA | Bluetooth + RCA | Bluetooth + 3.5mm AUX + U-disk | Bluetooth + RCA + U-disk |
| Output | Passive Speakers | Passive Speakers | Passive Speakers | Passive Speakers+Active/Passive Subwoofer | Passive Speakers + Active Speakers/Amplifier/Active Subwoofer | Passive Speakers + Active Subwoofer |
| Treble & Bass Control | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| THD | ≤ 0.04% | ≤ 0.04% | ≤ 0.04% | ≤ 0.04% | ≤ 0.001% | ≤ 0.05% |
| SNR | ≥ 98dB | ≥ 98dB | ≥ 98dB | ≥ 98dB | ≥ 92dB | ≥ 98dB |
| Terminating Impedance | 2-8 Ohm | 2-8 Ohm | 2-8 Ohm | 2-8 Ohm | 2-8 Ohm | 2-8 Ohm |
| Power Adapter | 19V/4.74A | 24V/4.5A | 24V/4.5A | 24V/4.5A | 24V/4.5A | 24V/4.5A |
| Work Voltage | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V |
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| BOX X1 | BOX X4 | Q4 | N2 | PH04 | M03 | |
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1,171
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607
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2,713
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208
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433
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659
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| Price | $39.99 | $89.99 | $69.99 | — | $29.99 | $79.99 |
| Type | Phono Preamp | Phono Preamp with Vacumm Tubes | DAC+Headphone Amp | Portable Headphone Amp | Headphone Amp | Subwoofer Amp/Mono Amp |
| MAX Power Output | Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. | Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. | Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. | 330mW@16 Ohm | 40mW@100 Ohm | 200W |
| Input | RCA | RCA+3.5mm AUX | PC-USB + Optical + Coaxial | 3.5mm AUX | 3.5mm AUX | RCA |
| Output | Active Speakers + Headphone | RCA+3.5mm AUX | RCA + 3.5mm Headphone | 3.5mm AUX | 3.5mm Headphone | Passive Speakers + Active/Passive Subwoofer |
| Treble & Bass Control | x | ✓ | ✓ | x | x | x |
| THD | ≤ 0.08% | ≤0.1% | ≤0.01% | ≤ 0.005% | - | ≤0.03% |
| SNR | ≥ 70dB | ≥ 70dB | ≥105dB | ＞100dB | - | ≥106dB |
| Terminating Impedance | - | - | 16-200 Ohm | 16-600 Ohm | 15-150 Ohm | 4-8 Ohm |
| Power Adapter | 12V/1.5A | 12V/1.5A | - | Battery capacity: 2200mA | - | 32V/5A |
| Work Voltage | AC 110V - 240V | AC 110V - 240V | DC 5V | - | DC 12V | AC 110V - 240V |
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Reviews with images
Good things come in small packages!
Purchased to drive classic Bose Acoustimass AM5 cube speakers with subwoofer. This little amp packs a punch and delivers clean sound at every volume level with no distortion. It has a very nice cast aluminum case with matching Bass, Treble and Volume control knobs - good build quality overall. Primary audio source is iMac with 3.5mm audio jack. Easy to pair with Bluetooth too. Purchased in June 2020 however in Aug, the Left channel would intermittently cut out. Unit comes with 18 month warranty so I contacted Tech support. Note: Tech support is in China but was very responsive via email. After customary troubleshooting, it was determined to be a logic board issue. A new board was shipped out (free shipping, at manufacturer's cost) and received within 2 weeks. Replacement instructions were clear and simple - the unit is modular and easy to disassemble, just 4 screws in the front plate, pull out control knobs and board slides out, replaced board in about 5 mins, issue resolved! Hopefully the new board will last much, much longer and if not, I am confident that Fosi will stand by their products and certainly honor the warranty hence my rating of 5 stars - I believe it's a good product backed by equally good support and service!
Top reviews from the United States
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Reviewed in the United States on February 24, 2021
Reviewed in the United States on March 17, 2024
Reviewed in the United States on August 30, 2020
Purchased to drive classic Bose Acoustimass AM5 cube speakers with subwoofer. This little amp packs a punch and delivers clean sound at every volume level with no distortion. It has a very nice cast aluminum case with matching Bass, Treble and Volume control knobs - good build quality overall. Primary audio source is iMac with 3.5mm audio jack. Easy to pair with Bluetooth too. Purchased in June 2020 however in Aug, the Left channel would intermittently cut out. Unit comes with 18 month warranty so I contacted Tech support. Note: Tech support is in China but was very responsive via email. After customary troubleshooting, it was determined to be a logic board issue. A new board was shipped out (free shipping, at manufacturer's cost) and received within 2 weeks. Replacement instructions were clear and simple - the unit is modular and easy to disassemble, just 4 screws in the front plate, pull out control knobs and board slides out, replaced board in about 5 mins, issue resolved! Hopefully the new board will last much, much longer and if not, I am confident that Fosi will stand by their products and certainly honor the warranty hence my rating of 5 stars - I believe it's a good product backed by equally good support and service!
Images in this review
Reviewed in the United States on March 21, 2022
Top reviews from other countries
Justin Cochrane
Great value, good from environmental perspective
Reviewed in Canada on December 5, 2021
Guido v
Fosi Audio BT10A-S
Reviewed in Belgium on April 8, 2024
Guido v
Reviewed in Belgium on April 8, 2024
Stereo audio en bluetooth werkt heel goed.
Aangesloten aan sony boxen 2x 50 watt 4 ohm.
Images in this review
ma_tyle & kam
Bardzo dobra opcja. Jakość do ceny. Do tego ładnie, skromnie i funkcjonalnie.
Reviewed in Poland on January 5, 2024