Will this work with Fosi Audio BL20A ? Will it improve sound quality?

Max voltage for the BL20A is 24V. This is the limit for the two TPA3116D2 chips, so I would not recommend a 32V power supply. Fosi Audio sells a 24V supply that might "improve" sound with respect to the amount headroom (large swings in volume) you can get without distortion but I doubt you could tell the difference at reasonable volumes.

Bt30dpro is only rated to 36v5a does this supply really work for it? is there a 36/48v 10a version?

I bought this power supply for the for the Fosi BT10D it will take up to a 48 volt power supply. My two other Fosi amps will only use a 32 volt power supply. So you must be careful to use the correct unit. Sadly I am not familiar with the BT30Dpro. If you go to the Fosi website they might have additional information. I am sorry I could not be more help.

did it improve bt20a pro quality? if yes which speaker type and watt do you use that make a difference?

48 V power supply improved sound with more clarity and wider soundstage. Speaker type is best at 8ohms.

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Fosi Audio 48V 5A Power Adapter Supply for Home Audio Bluetooth Stereo Receiver Amplifier Mini Hi-Fi Class D Integrated Amp

Fosi Audio 48V 5A Power Adapter Supply for Home Audio Bluetooth Stereo Receiver Amplifier Mini Hi-Fi Class D Integrated Amp

Product ID: 549695750

Details

Amperage
5 Amps
Brand
Fosi Audio
Colour
Black
Compatible Devices
Home Audio
Included Components
1 Power
Output Voltage
48 Volts

⚡48V stable output

🔋5A high current delivery

🛡️Built-in safety protections

49296 som

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Description

🔌 Plug into power that keeps your sound sharp and your setup sleek!

BUILT TO LAST - Crafted with premium materials ensuring durability for long-term, reliable use.
COMPACT POWERHOUSE - Sleek, lightweight design fits perfectly in any home or office audio setup.
SAFETY FIRST ALWAYS - Equipped with overcurrent and overvoltage protection to safeguard your gear.
AMP UP WITHOUT LIMITS - Supports up to 5A current for high-power audio setups that demand more.
POWER YOUR SOUND LIKE A PRO - Delivers a consistent 48V output to keep your amplifier running flawlessly.

The Fosi Audio 48V 5A Power Adapter is engineered to provide stable, high-current power specifically for Fosi Audio amplifiers and similar high-power audio devices. With robust safety features and a compact design, it ensures reliable, long-lasting performance in home, office, or industrial audio environments.

Specifications

ASIN	B0C2BQ4P8J
Amperage	5 Amps
Best Sellers Rank	#76,942 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #1,313 in Power Supplies (Computers & Accessories)
Box Contents	1 Power Adapter
Brand	Fosi Audio
Brand Name	Fosi Audio
Colour	Black
Customer Reviews	4.6 out of 5 stars 451 Reviews
Importer Contact Information	[email protected]
Item Dimensions	19.3 x 9 x 3.8 Centimeters
Item Weight	0.79 Kilograms
Item Weight Unit of Measure	0.79 Kilograms
Item dimensions L x W x H	19.3 x 9 x 3.8 Centimeters
Manufacturer	fosiaudio
Manufacturer Part Number	48V電源
Maximum Power	240 Watts
Model Number	48V
Output Voltage	48 Volts
Output Wattage	240 Watts
Packer Contact Information	[email protected]
Unit Count	1 Count

Reviews

P**R

Definitely improvement over 32V oem adapter comes alongwith......reading reviews i was bit confused but again changing mind i ordered & results were great.....yes fosi audio heat lil bit but that's ok but adapter being cool even after 4-5 hours use. Using QA 3020i with fosi audio....amazing no need to add subwoofer now.

3.10.2025

A**R

Product is good but no improvement

Only volume became louder but No improvement in sound by switching to this expensive power supply.the tone of the sound actuallyy feels dull now. Am using it with fosi 20d bt pro. Unlike posted on web,this power supply is not the right match. It's better to buy more efficient speakers.

25.12.2024

G**Y

48V 5amp not working

48v /5 amp And 32v /5 amp no deference

10.10.2024

M**U

Adaptor costs more than compatible Class-D amplifier

If I want to upgrade my existing Amplifier to have additional power, the adapter costs ~70% of the compatible Class-D amplifiers from Fosi Audio.

29.02.2024

G**R

Super upgrade voor Fosi versterker

Wat een verbetering t.o.v. de meegeleverde voedingsadapter. Klank stukken beter, meer vermogen van de versterker. Geen ruis of vervorming, kan ganse dag spelen zonder oververhit te raken. Had dit gelezen op een forum over Fosi versterkers en vergelijkbare toestellen. Klinkt even goed als mijn Denon en Yamaha nu. Echt een super aanrader, een upgrade om U tegen te zeggen en dit voor een prijsje. Top.

10.12.2025

N**N

Good

Recommended to use for fosi v3, no problems at all for 1 year.

30.09.2025

G**R

Fosi Audio V3 sahipleri sahip olması gerekli..

sipariş ettikten 11 gün sonra teslim edildi, kesinlikle V3 sınıf atladı. Odyofil değilim ancak ses kalitesi konusunda bariz netlik ve vurgulu solo seslerde ise hafif boyut kazandı. güç konusuna ben girmiyorum amacım güç almak değildi ama doğal olarak güçte geldi, tavsiye ederim

9.01.2024

T**O

excelente opción de alimentación de corriente directa a 48 V a 5 amp

Muy buena calidad de adaptador: Fosi Audio - Adaptador de corriente de 48 V 5 A para audio en el hogar, amplificador estéreo Bluetooth, mini Hi-Fi clase D, amplificador integrado. Entrega en tiempo y sin maltratos en sus características cajas de Productos fosi Merece hasta este momento por buen desempeño ( tres meses de funcionamiento) 5 estrellas

19.05.2025

M**H

Excellent upgrade

Significantly improved the performance of my DAC. Well worth it.

10.03.2026

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49296 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Kyrgyzstan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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