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Fosi Audio BT20A Bluetooth 5.0 Stereo Audio 2 Channel Amplifier Receiver Mini Hi-Res Class D Integrated Amp 2.0CH for Passive Speakers 100W x 2 with Bass and Treble Control TPA3116 (with Power Supply)

4.5 out of 5 stars 3,748 ratings
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Amazon's Choice for "amplifier"

-9% $105.99
RRP: $116.00

Recommended Retail Price (RRP)

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Enhance your purchase

  • Small simple compact design but practical and powerful, little Hi-Fi Bluetooth wireless amplifier exclusively designed for the customers who pursue Hi-Fi sound.
  • CSR Bluetooth 5.0 core, up to 50ft connection range guarantees low signal delay. No pop, no audible noise when Bluetooth connection is established.
  • 100W RMS X 2(4 ohms, 20 Hz - 20 kHz, 0.04% THD), comes with 24V power supply, can drive 280watts(8 ohm), 320watts(4 ohm) speakers. (For passive speakers only, not the powered speakers.)
  • Advanced circuitry design, built-in speakers protection circuit, best for bookshelf/computer/desktop/speakers in your home.
  • Home integrated digital amplifier, 18-month warranty, you can return the item if you have any problems.
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Special offers and product promotions

  •  10% coupon applied at checkout. Terms  
  • Save 5% on ♥ Banana Plugs ♥ when you purchase 1 or more ♥ Fosi Audio Amplifier ♥ offered by Fosi Audio AU. Select "Add both to Cart" to automatically apply promo code 3C225UD4. Here's how (terms and conditions apply)
  • Save 10% on ♥ M02 Subwoofer Amplifier ♥ when you purchase 1 or more ♥ BT20A Bluetooth Amplifier ♥ offered by Fosi Audio AU. Select "Add both to Cart" to automatically apply promo code 276SPLHN. Here's how (terms and conditions apply)

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Package Dimensions ‏ : ‎ 26 x 18.7 x 6.2 cm; 870 Grams
  • Date First Available ‏ : ‎ 26 March 2018
  • Manufacturer ‏ : ‎ Fosi Audio
  • ASIN ‏ : ‎ B07BQC7GNL
  • Item Model Number ‏ : ‎ BT20A
  • Customer Reviews:
    4.5 out of 5 stars 3,748 ratings

Product guides and documents

Buy it with

  • Fosi Audio BT20A Bluetooth 5.0 Stereo Audio 2 Channel Amplifier Receiver Mini Hi-Res Class D Integrated Amp 2.0CH for Passive
  • +
  • Monoprice 109436 Gold Plated Speaker Banana Plugs – 5 Pairs – Closed Screw Type, for Speaker Wire, Home Theater, Wall Plates
  • +
  • Fosi Audio BT30D Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Res Class D Integrated Amp 50 Watt x2+100
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Product Description

BT20A
Fosi Audio BT20A
BT20A BT20A-S BT10A BL20C TB10A BT30D
BT20A BT20A-S BT10A BL20C TB10A BT30D
Type Bluetooth 2.0 CH Amp Bluetooth 2.0 CH Amp Bluetooth 2.0 CH Amp Bluetooth 2.1 CH Amp 2.0 CH Amp Bluetooth 2.1 CH Amp
Input Bluetooth + RCA Bluetooth + RCA Bluetooth + 3.5mm AUX Bluetooth + RCA + U-disk RCA Bluetooth + RCA
Output Passive Speakers Passive Speakers Passive Speakers Passive Speakers + Active Subwoofer Passive Speakers Passive Speakers+Active/Passive Subwoofer
Treble & Bass Control
THD ≤ 0.04% ≤ 0.04% ≤ 0.04% ≤ 0.05% ≤ 0.04% ≤ 0.04%
SNR ≥ 98dB ≥ 98dB ≥ 98dB ≥ 98dB ≥ 98dB ≥ 98dB
Terminating Impedance 2-8 Ohm 2-8 Ohm 2-8 Ohm 2-8 Ohm 2-8 Ohm 2-8 Ohm
Power Adapter 24V/4.5A 24V/4.5A 19V/4.74A 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
MAX Power Output 100W x 2 100W x 2 50W x 2 160W x 2 100W x 2 50W x 2+100W
BOX X2 Q4 M02 M03 BOX X1 ZK-TB21
BOX X2 Q4 M02 M03 BOX X1 ZK-TB21
Type Phono Preamp with Vacumm Tubes DAC+Headphone Amp Subwoofer Amp/Mono Amp Subwoofer Amp/Mono Amp Phono Preamp Bluetooth 2.1 CH Amp Board
Input RCA+3.5mm AUX USB + Optical + Coaxial RCA RCA RCA Bluetooth + 3.5mm AUX
Output Active Speakers RCA + 3.5mm Headphone Passive (Speakers + Subwoofer) Passive Speakers + Active/Passive Subwoofer Active Speakers + Headphone Passive Speakers + Passive Subwoofer
Treble & Bass Control
THD ≤ 0.1% 0.01% ≤0.03% ≤0.03% ≤ 0.08% -
SNR ≥ 98dB ≥105dB ≥106dB ≥106dB ≥ 70dB -
Terminating Impedance - 16-200 Ohm 2-8 Ohm 4-8 Ohm - 4-8 Ohm
Power Adapter 12V/1.5A - 19V/4.74A 32V/5A 12V/1.5A -
Work Voltage AC 110V - 240V DC 5V AC 110V - 240V AC 110V - 240V AC 110V - 240V DC 5V-24V
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. 100W 200W Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. 50W x 2+100W

Important information

Safety Information:

Please plug the power cord into the amp THEN the wall.


Customer Questions & Answers

Customer reviews

4.5 out of 5 stars
4.5 out of 5
3,748 global ratings

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Top reviews from Australia

Reviewed in Australia on 3 May 2021
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3 people found this helpful
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Reviewed in Australia on 16 September 2021
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2 people found this helpful
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Reviewed in Australia on 9 February 2021
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3 people found this helpful
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Reviewed in Australia on 13 September 2021
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One person found this helpful
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Reviewed in Australia on 28 June 2021
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2 people found this helpful
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Reviewed in Australia on 30 March 2021
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5.0 out of 5 stars Great little amp that exceeds expectations considering it’s price.
By Mark Leon on 30 March 2021
Great little class D amplifier for the price. I e got it driving two old bookshelf speakers and I’m really happy with the results.

It’s lively and has a little punch but I wouldn’t believe the quoted 100rms personally... still, if that’s the kind of power you need to drive your speakers, you wouldn’t buy this amp anyway.

The bass and treble dials do what you’d expect them to and Bluetooth seems pretty consistent.
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2 people found this helpful
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Reviewed in Australia on 6 July 2021
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5.0 out of 5 stars Bring your old speakers back to life
By digifish on 6 July 2021
I had a pair of unused B&W speakers sitting in the cupboard and I was looking for a way to bring them back to life. So I saw the Fosi got good reviews and it was cheap so worth the gamble.

Its amazing how small this Amp is. It's so small the Power Supply is about the same size. Crazy!

The Bluetooth connectivity is excellent, quick and easy. Really impressed with how well it works, since I have had some BT devices in the past that were a bit cranky about connecting.

The Bass and Treble controls are nice to haves, although need to be used with moderation.

I normally use NAD and Rotel amps with my audio gear and next to those, this sounds pretty good. Definitely a great first amp for someone who wants to power some moderately sized bookshelf speakers.
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One person found this helpful
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Reviewed in Australia on 1 May 2021
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Top reviews from other countries

Benny
5.0 out of 5 stars Top 2x100W Verstärker zu einem sehr fairen Preis
Reviewed in Germany on 7 September 2020
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54 people found this helpful
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Shiv
5.0 out of 5 stars Stop wasting time and just buy!!!!
Reviewed in the United Kingdom on 31 January 2020
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5.0 out of 5 stars Stop wasting time and just buy!!!!
Reviewed in the United Kingdom on 30 January 2020
I wanted to power my Wharfedale Diamond 9.1s, but my AV receiver was too large so I took the plunge and bought this mini class D amp. OMG wow this amp makes my speakers sound better then my Onkyo amp!!! As an audiophile, I am quite fussy about sound, but wow this is the best thing I did! I Bi-wired my speakers and they sound great... I recommend using banana plugs for superior sound.

The only thing missing from this wonderful amp is a remote, so Fosi Audio if you are reading this, please produce a remote for your amps it would make the experience absolutely perfect!

Anyway so far so good! Definitely will recommend to anyone, its a god send!
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22 people found this helpful
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Sone Stone
4.0 out of 5 stars Quite decent but not enough volume...get better for £12 more.
Reviewed in the United Kingdom on 19 June 2020
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18 people found this helpful
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darkmatter74
5.0 out of 5 stars Hifi sound at low-fi prices
Reviewed in the United Kingdom on 29 November 2020
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5.0 out of 5 stars Hifi sound at low-fi prices
Reviewed in the United Kingdom on 28 November 2020
Considering the price and size of this amp, you will not believe the hifi quality sound it produces - crystal high frequencies, tight low end with strong mids. The bluetooth connectivity is great.

I originally bought some expensive PC speakers to play my hi-res music from my MAC while I'm working. They were pants!! So I thought I'd look for a hi-fi solution. Worried about what I would get on a budget, I luckily found this amp along with a pair of entry level Wharfedale speakers. Reviews for this amp were extremely favourable so I bit the bullet. I am so glad I did.

This is a PERFECT solution for what I needed. Hi-res hi-fi sound from my MAC. I think anyone who buys real hifi products would be extremely surprised at the performance from this little unit. It wouldn't replace my full hi-fi amp but it is not far off.

If you are on a budget and need sound from your MAC or PC, forget the range of 'computer speakers'. Most of them are poor. Get this amp and some decent hi-fi speakers. You won't regret it. I am stunned and over the moon with it!
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12 people found this helpful
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C.R
5.0 out of 5 stars Bluetooth stopped working after 30 days - I now have a replacement though
Reviewed in the United Kingdom on 18 April 2020
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13 people found this helpful
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