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.

48v 5a Power Adapter Supply For Home Audio Bluetooth Stereo

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Description

🔌 Power your audio kingdom with Fosi’s 48V 5A adapter — because your sound deserves the best!

SAFETY FIRST ALWAYS - Integrated overcurrent and overvoltage protection keeps your gear safe and sound.
POWER YOUR SOUND LIKE A PRO - 48V stable voltage ensures your amplifier runs at peak performance without dips or drops.
AMP UP WITH 5 AMPS OF PURE POWER - Delivers a robust 5A current, perfect for high-power home audio setups and mini Hi-Fi amps.
SLEEK PORTABLE AND SPACE SAVVY - Lightweight and compact design fits effortlessly into any home, office, or studio environment.
BUILT TO LAST DESIGNED TO IMPRESS - Crafted with premium materials for long-term durability and consistent reliability.

The Fosi Audio 48V 5A Power Adapter is a high-quality, reliable power supply designed specifically for Fosi Audio amplifiers and other high-power audio devices. It delivers a stable 48V output with up to 5 amps of current, ensuring optimal performance for your home or office audio setup. Built with safety features like overcurrent and overvoltage protection, this compact and lightweight adapter guarantees durability and safe operation in various environments.

Specifications

ASIN	B0C2BQ4P8J
Additional Features	Lightweight Design
Amperage	5 Amps
Best Sellers Rank	#315,298 in Electronics ( See Top 100 in Electronics ) #1,134 in Power Supplies (Computers & Accessories)
Box Contents	1 Power Adapter
Brand	Fosi Audio
Brand Name	Fosi Audio
Colour	Black
Compatible Devices	Home Audio
Country of Origin	China
Current Rating	5 Amps
Customer Reviews	4.6 out of 5 stars 413 Reviews
Importer Contact Information	[email protected]
Included Components	1 Power Adapter
Item Weight Unit of Measure	0.79 Kilograms
Main Power Connector Type	2 pin
Manufacturer	fosiaudio
Model Number	48V
Mounting Type	Wall Mount
Output Voltage	48 Volts
Packer Contact Information	[email protected]
Portable	Yes
Power Source	Corded Electric
Special Feature	Lightweight Design
Total USB Ports	1
Unit Count	1 Count
Wattage	36 Watts

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

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