Quick answer
Choose the BT20A Pro ($99.99 with a 32V 5A supply) if you want Bluetooth 5.0 plus bass and treble controls. Choose the V3 ($89.99) if you only use wired sources and want the upgraded capacitors and inductors and a logarithmic volume pot. Choose the TB10D ($79.99) if you want the cheapest way into TPA3255 power with simple analog RCA input. All three list a 24-month warranty.
Fosi Audio V3 vs BT20A Pro vs TB10D: spec comparison
| Spec | V3 | BT20A Pro | TB10D |
|---|---|---|---|
| Price (with 32V 5A PSU) | $89.99 | $99.99 | $79.99 |
| Price (no PSU) | $69.99 | $79.99 | n/a |
| Amp chip | TI TPA3255 | TI TPA3255 | TI TPA3255 |
| Output | 300 W x 2 | 300 W x 2 | 300 W x 2 @ 4 ohm |
| Bluetooth | Not listed (RCA) | Yes, Bluetooth 5.0 | No (RCA analog input) |
| Tone controls | Not listed; log volume pot | Bass and treble | Bass, treble, volume |
| Swappable op-amps | Yes (two NE5532) | Yes (two NE5532) | Not listed |
| Quoted figures | Premium NCC/ELNA/WIMA capacitors, Sumida inductors | SNR 108 dB or better, THD 0.005% or less | SNR 90 dB or better, THD 0.3% or less |
Source: Fosi Audio product pages. Figures are manufacturer claims; PickNexo has not measured them.
Check current Fosi Audio pricesThe three amps
Fosi Audio V3
From $69.99 (no PSU); $89.99 with 32V 5A
- Upgraded parts: Sumida inductors, NCC, ELNA and WIMA capacitors
- Logarithmic-taper volume pot
- Replaceable NE5532 op-amps (SS3602, MUSES02, OPA2134PA compatible)
- Vented case designed as a heatsink; 24-month warranty
Fosi Audio BT20A Pro
From $79.99 (no PSU); $99.99 with 32V 5A
- Bluetooth 5.0 with pairing memory
- Bass and treble controls
- Swappable op-amps; SNR 108 dB or better, THD 0.005% or less
- Higher power supplies available: 48V 5A at $129.99, GaN 48V at $149.99
Fosi Audio TB10D
$79.99 with 32V 5A supply
- Analog RCA input, banana-plug speaker outputs
- Bass, treble and volume knobs
- 300 W x 2 at 4 ohms, 150 W x 2 unclipped at 8 ohms
- 1.05 kg; Fosi notes a 48V 10A supply is needed for maximum power
Power supply: the hidden cost
Fosi's own TB10D page says the included 32V 5A adapter will not reach the full 300 W x 2 rating and suggests a more powerful supply such as 48V 10A. The V3 and BT20A Pro are sold with 48V and GaN supply options at higher prices, so the real cost of an amp tuned for power-hungry speakers is closer to $110-$150. Small bookshelf speakers on a desk rarely need the maximum, so the 32V kits are the sensible starting point.
Which should you choose?
Pick the V3 if...
- Your sources (DAC, turntable preamp, CD player) are wired.
- You want finer volume control at low listening levels.
- You like experimenting with op-amps.
Pick the BT20A Pro if...
- You stream from a phone or laptop without a separate DAC.
- You want quick bass and treble tweaks.
- You want one box for a desk or small room.
Pick the TB10D if...
- The lowest price matters most.
- You only need analog input and simple knobs.
Look elsewhere if...
- You need balanced XLR input or mono bridging: see the Fosi ZA3 on the brand's store.
Strengths on paper
- Same TPA3255 chip and 300 W x 2 rating across all three.
- Low prices and 24-month warranty.
- Op-amp rolling on V3 and BT20A Pro.
Watch-outs
- Class-D amps need a suitable power supply to hit rated power.
- V3 lists no Bluetooth; TB10D has none.
- Specs are manufacturer claims, not independent measurements.
Ready to pick?
Shop Fosi Audio amplifiersBuilding a full desk setup? Pair an amp with a DAC (see the Fosi Audio overview) and compact speakers; our Edifier desktop speakers comparison shows powered alternatives that skip the separate amp entirely, and the Apos Audio review covers another budget hi-fi brand.
Fosi Audio V3 vs BT20A Pro vs TB10D FAQ
Is the Fosi V3 better than the BT20A Pro?
The V3 lists upgraded components and a log volume pot, while the BT20A Pro adds Bluetooth and tone controls. Which is better depends on whether you value wireless features or a simpler wired design.
Does the Fosi TB10D have Bluetooth?
No. The TB10D takes analog RCA input. Fosi points Bluetooth buyers to the BT20A Pro.
What power supply do I need for a Fosi TPA3255 amp?
The listings include a 32V 5A supply. Fosi says a more powerful supply, such as 48V 10A, is needed for maximum output on the TB10D, and offers 48V and GaN options for the V3 and BT20A Pro.
Can I swap op-amps in these amplifiers?
Fosi lists two replaceable NE5532 op-amps on the V3 and BT20A Pro, compatible with chips such as SS3602, MUSES02 and OPA2134PA. The TB10D listing does not mention it.
Related on PickNexo
- Fosi Audio review: amps, DACs and hi-fi gear
- Edifier desktop speakers compared
- Apos Audio review
- All PickNexo guides
Sources
- Fosi Audio V3 product page
- Fosi Audio BT20A Pro product page
- Fosi Audio TB10D product page
- PC Perspective: Fosi Audio V3 review
- PC Perspective: Fosi Audio BT20A Pro review
PickNexo has not tested these products hands-on; this article summarises official information and reputable reports. Some links are affiliate links, which may earn us a commission at no extra cost to you. Affiliate disclosure.
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