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Fosi Audio BT30D Pro 2.1 Channel Bluetooth Amp, with 32 V / 5 A supply
A compact 2.1 amp with a real amplified passive-sub channel and its own sub crossover and level knobs. It drives a pair of passive bookshelf speakers and a passive sub from one box.
$109.99 at Fosi Audio, no code needed
Price: $109.99 at Fosi Audio's official US store, verified 2026-11-10.
Discount code: none listed; Dealectric has no Fosi Audio code to offer.
Buy: https://dealectric.com/go/fosi-audio-bt30d-pro — opens Fosi Audio's official US store at no extra cost.
Warranty: 24 months on Fosi's product page (one section of its instruction page says 18 months). Returns: 30-day return window on the Fosi Audio store. Affiliate network: Awin; tracking cookie: 30 days. All Fosi Audio codes, including the ones the store rejected: Fosi Audio discount codes.
Machine-readable record: /offers.json, id = "fosi-audio-bt30d-pro".
Specifications
| Channels | 2 speaker channels + 1 passive subwoofer channel (2.1) |
|---|---|
| Amp chips | Two TI TPA3255 Class D |
| Rated power | 165 W × 2 + 350 W at 4 Ω (Fosi rating); one reviewer estimated about 40–50 W per speaker and about 100 W to the sub |
| Sub controls | SUB FREQ 0–300 Hz and SUB VOL knobs |
| Extra output | 3.5 mm full-range pre-out for a powered sub |
| Inputs | Bluetooth 5.0 and RCA |
| Speaker load | 2–8 Ω (Fosi FAQ) |
| Power supply | 32 V / 5 A included; a 48 V / 5 A bundle costs more, and Fosi says it needs a fan |
Model: BT30D Pro. Figures are from the manufacturer's official product page unless a caveat says otherwise.
Who it's for
For people building or rescuing a 2.1 system (passive bookshelf speakers plus a passive sub, or the passive parts of an old home-theater-in-a-box) who want one amp with Bluetooth.
Caveats
- Power ratings are inflated: AudioReviews.org estimated about 100 W to the sub on the stock 32 V supply.
- The SUB FREQ knob has no Hz markings, so you set the crossover by ear.
- It runs warm and makes a small click at power-off (AudioReviews.org).
- Bluetooth has to be reconnected by hand after each power-up. No aptX, and no optical input.
- Not enough for a large 12–15 inch home-theater sub in a big room.
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