Fosi BT20A Pro 32V vs 48V Power Supply: What Changes?
The BT20A Pro accepts 24–48V DC, and Fosi sells it with 32V 5A or 48V 5A supplies. The larger supply mainly increases available power headroom.
What Speaker Impedance Works With the Fosi BT20A Pro?
Fosi specifies the BT20A Pro for 2–8 ohm terminating impedance. Here is what that does and does not mean for real speakers.
Can You Connect a Turntable to the Fosi BT20A Pro?
Yes, but a turntable needs a phono preamp somewhere in the chain unless the turntable already has one built in.
Can You Connect a TV to the Fosi BT20A Pro With Optical Audio?
The BT20A Pro does not have an optical input. A TV with optical-only audio needs a DAC or other converter before the amp.
Can the Fosi BT20A Pro Power a Passive Subwoofer?
The BT20A Pro has a 3.5 mm pre-out for an active/powered subwoofer, not a dedicated amplified passive-subwoofer output.