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

Product ID: 553223851

Details

Brand
Fosi Audio
Colour
Black
Connector type
2-Pin
Item weight
0.79 Kilograms
Material
Plastic

⚡48V stable output

🔋5A high current delivery

🛡️Built-in safety protections

Description

🔊 Elevate your audio game with power that never quits!

COMPACT POWERHOUSE - Sleek, lightweight design fits effortlessly into any home or office audio setup without clutter.
SAFETY FIRST ALWAYS - Integrated overcurrent and overvoltage protection keeps your gear safe during marathon listening sessions.
AMP UP WITHOUT LIMITS - Delivers a robust 5A current, perfect for high-power audio setups demanding deep bass and crisp highs.
POWER YOUR SOUND LIKE A PRO - 48V stable voltage ensures your amplifier performs at peak clarity and power.
TRUSTED UPGRADE FOR AUDIOPHILES - Specifically engineered for Fosi Audio amps, transforming your sound experience with zero noise or distortion.

The Fosi Audio 48V 5A Power Adapter is a compact, durable power supply designed to deliver stable 48V output and up to 5 amps of current, ideal for powering Fosi Audio amplifiers like BT20A Pro, TB10D, and V3. Featuring built-in safety protections and a lightweight form factor, it ensures reliable, distortion-free performance for home, office, or industrial audio setups.

Specifications

ASIN	B0C2BQ4P8J
Amperage	5 Amps
Best Sellers Rank	#47,435 in Electronics ( See Top 100 in Electronics ) #414 in Audio & Video Adapters
Brand	Fosi Audio
Built-In Media	Cable
Color	Black
Connector Type Used on Cable	2-Pin
Customer Reviews	4.6 4.6 out of 5 stars (471)
Enclosure Material	Plastic
Form Factor	Compact
Input Voltage	48 Volts
Item Dimensions	19.3 x 9 x 3.8 centimeters
Item Weight	0.79 Kilograms
Manufacturer	Fosi Audio
Maximum Power	240 Watts
Mfr Part Number	48V-EU
Model Number	48V-EU
Number of Items	1
Number of Packs	1
Output Current	5 Amps
Output Voltage	48 Volts
Output Wattage	240 Watts
Specification Met	CE
Unit Count	1.0 Count

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