Fosi Audio builds its own compact DACs and amps. Apos Audio is an audio retailer that sells other makers' gear. Here is how a desk setup from each stacks up on price and features.
Prices and availability checked on 2026-11-02; they may change.
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These two are not direct rivals: Fosi Audio is a manufacturer, Apos Audio is a retailer. For the lowest price per feature, a Fosi Audio stack (Q4 DAC at $69.99 plus TB10D amp at $79.99) covers a desk system for about $150. If you want to mix brands (SMSL DAC, FiiO dongle, Moondrop active speakers) and like a 45-day return window, Apos is the place to shop. Pick Fosi for value, Apos for variety.
Fosi Audio sells its own products directly: mini Class D amplifiers, desktop DACs and headphone amps. Apos Audio, per its homepage, offers free US shipping, a 45-day return policy, a lowest price guarantee and a one-year transferable warranty, and carries brands such as SMSL, FiiO, Moondrop and TOPPING. Apos even lists a few Fosi products too, so the choice is less "either/or" than it looks. See our earlier Fosi Audio review and Apos Audio review for the store-level view.

$199.99

$179.99

$79.99

$69.99
The Fosi trade-off is simple: more chipset and connectivity per dollar, but a narrower range. For amp-only decisions, see our Fosi V3 vs BT20A Pro vs TB10D guide.
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$161.49

$144.49

$65.99
Apos also lists the SMSL A100 Bluetooth mini amp (80W x 2, MA12070 chip) at $82.02, but that listing is an open-box unit, so check stock and condition before ordering.
| Setup | Parts | Approx. price | Best for |
|---|---|---|---|
| Fosi budget stack | Q4 DAC + TB10D amp (+ your passive speakers) | $149.98 | Cheapest desk hi-fi |
| Fosi headphone desk | K7 (DAC + headphone amp) | $199.99 | Demanding headphones, 4.4mm balanced |
| Fosi TV/desk hybrid | ZD3 DAC + TB10D | $259.98 | HDMI ARC, XLR outputs |
| Apos powered desk | SMSL SU-3 + Moondrop MM3A | $305.98 | Compact speakers with EQ |
| Apos portable-to-desk | FiiO KA13 + your headphones | $65.99 | Phone/laptop and IEMs |
Totals are simple sums of the listed prices above and exclude cables, shipping and tax.
No. Fosi Audio makes and sells its own gear. Apos Audio is a retailer that sells products from other makers, plus a few Fosi items.
On the listed prices, the Fosi Q4 ($69.99) plus TB10D ($79.99) is about $150 before speakers. The FiiO KA13 at $65.99 is the lowest entry if you only use headphones.
Its USB DACs are plug and play according to Fosi, and the K7 and ZD3 offer higher-end chipsets. Whether they sound better than alternatives is subjective and untested by us.
Apos states a 45-day return policy and a one-year transferable warranty on its homepage. Check the product page for exceptions.
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.