AIYIMA A07 TPA3255 Power Amplifier vs Fosi Audio BT20A Bluetooth Stereo Amplifier
Both are small Class D desktop amps with Bluetooth, and neither has a DAC worth paying extra for. The AIYIMA A07 is the stronger pick for raw power and a subwoofer output; the Fosi BT20A is the simpler, cheaper choice for a small room. Compare current prices at each store before you buy, since both sell well under $100 most of the time.
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AIYIMA A07 TPA3255 Power Amplifier
Choose the AIYIMA A07 if you want more clean headroom, a subwoofer output, and a 3.5mm pre-out for a powered sub or second zone.
Pros
- TPA3255 delivers far more power per dollar than most amps this size
- Subwoofer output makes it easy to add a powered sub
- 3.5 mm pre-out lets you feed a second amp or powered speakers
- Bluetooth 5.0 for phone and tablet streaming
- Runs cool and stays quiet at idle
Cons
- RCA input only, no optical or USB
- No tone controls or remote
- Full 300 W per channel needs the 48V supply, not the 32V one
What separates them
| AIYIMA A07 TPA3255 Power Amplifier | Fosi Audio BT20A Bluetooth Stereo Amplifier | |
|---|---|---|
| Rated power | 600 W total (300 W + 300 W) on the TPA3255 chip | 320 W total |
| Amplifier chip | TPA3255 Class D | Class D, chip not stated |
| Bluetooth | Bluetooth 5.0 | Bluetooth, version not stated |
| Inputs | RCA only, one input | RCA plus Bluetooth, built-in DAC |
| Subwoofer output | Yes, active subwoofer out | No |
| Pre-out | 3.5 mm AUX pre-out | None listed |
| Size and weight | 151 mm wide, 33 mm tall, 1.05 kg | Smaller desktop chassis |
| Power supply |
Price history
- AIYIMA A07 TPA3255 Power Amplifier: lowest $60.99 on Nov 1.
- Fosi Audio BT20A Bluetooth Stereo Amplifier: lowest $79.99 on Nov 1 at Fosi Audio.
Prices at every store
Fosi Audio BT20A Bluetooth Stereo Amplifier
- AmazonCheck price at Amazon
- Fosi AudioCheck price at Fosi Audio
Specs compared
| Spec | AIYIMA A07 TPA3255 Power Amplifier | Fosi Audio BT20A Bluetooth Stereo Amplifier |
|---|---|---|
| Number Of Channels | 2.0 | 2 channel |
| Total Wattage | 600 W (300W+300W) | — |
| Amplifier Class | Class D | — |
| Bluetooth | 5.0 | — |
| Connection Type | Wired | — |
| Depth | 10 cm | — |
| Height | 33 MM | — |
| Width | 151 MM | — |
| Weight | 1.05 kg | — |
| Audio Outputs | 3.5 mm AUX Pre-out | — |
| HDMI Outputs | 0 |
Questions and answers
- Which is better for a turntable?
- Neither has a phono stage. You need a separate phono preamp into the RCA input on either amp. The A07's extra power helps with inefficient speakers.
- Which one drives harder speakers?
- The AIYIMA A07. Its TPA3255 chip is rated for 300 W per channel with a 48V supply, while the Fosi BT20A tops out around 320 W total. For 8-ohm bookshelf speakers both are fine; for low-sensitivity floorstanders the A07 has more headroom.
- Do I need a subwoofer output?
- If you plan to add a powered sub, yes, and only the A07 has one. The Fosi BT20A has no sub out, so a sub would have to take speaker-level input.
- Is the Fosi worth it over the A07?
- Only if the price gap is large and you do not need a sub out or pre-out. The A07 gives more power and more connections for a modest premium.
- Which is smaller?
- The Fosi BT20A. The A07 is 151 mm wide and 1.05 kg, which is still small enough for a desk but takes more shelf space.
- Can either run two pairs of speakers?
- No. Both are single-zone 2-channel amps with one pair of speaker terminals. Use a speaker selector if you need two pairs.