What Speaker Impedance Works With the Fosi BT20A Pro?
See all Fosi BT20A Pro compatibility questions
Short answer: Fosi specifies the BT20A Pro for 2–8 ohm speaker loads.
Does that mean every 2-ohm speaker setup is equally easy?
No. Speaker impedance is not perfectly constant across frequency, and lower impedances demand more current from an amplifier. Fosi’s supported range tells you the amp is designed to operate with nominal loads in that range, but volume, power supply, ventilation, and the actual speaker’s impedance curve still affect how hard the amp is working.
What about common 4-ohm and 8-ohm speakers?
Both fall squarely inside Fosi’s published range. The amplifier’s headline maximum power figure is specified at 4 ohms, but that does not mean an 8-ohm speaker is incompatible. It means available power differs with load and power supply.
Can I wire two pairs of speakers?
Be careful. Parallel wiring can lower the combined impedance substantially. Two nominal 8-ohm speakers per channel in parallel present roughly a 4-ohm nominal load; two 4-ohm speakers in parallel present roughly 2 ohms. Real impedance curves complicate that further, so multi-speaker wiring deserves more than just counting terminals.
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