Which has more real power, the BT20A or the V3?

The V3. Its 300 W is per channel at 4Ω, roughly 600 W total, while the BT20A's 320 W is a combined figure. The V3 also publishes its chip and distortion numbers.

Can I connect a subwoofer to either one?

Only the V3 has a pre-out, and it is volume-controlled, so a powered sub tracks the main volume. The BT20A has no subwoofer output.

Is the BT20A good enough for a turntable or TV?

It has RCA inputs plus Bluetooth, so a phono preamp or TV line-out works. The V3 is the cleaner path for wired sources but needs a separate Bluetooth receiver for wireless.

Which one runs cooler and quieter?

The V3 uses a full-body heatsink and buyers report it runs cool with minimal background noise. The BT20A publishes no noise figures, so the V3 is the safer pick for sensitive speakers.

Is the V3 worth the extra money?

If prices are close, yes: you get more power per channel, a sub out, published low distortion and swappable op-amps. Pay extra for the BT20A only if built-in Bluetooth saves you buying a streamer.

Do either include speaker cables?

The V3 ships with just the amp and power adapter; buyers note no cables are included. Check the BT20A box contents at the store before ordering.

Fosi Audio BT20A Bluetooth Stereo Amplifier vs Fosi Audio V3 Stereo Amplifier

Buy the V3 if you want clean, quiet Class D power for desktop or bookshelf speakers and may add a subwoofer later. Buy the BT20A if Bluetooth streaming from a phone or laptop is your main source. The V3 is the better amplifier on paper; the BT20A wins only on wireless convenience. No current prices were provided for either model, so compare live store prices on Deal.ai before deciding.

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