Best amplifier for a passive subwoofer
Updated 2026-11-10 · Pick: Crown XLS 1002, $500 on Amazon (checked 2026-11-12), buy on Amazon: https://www.amazon.com/dp/B011TI97VE?tag=dealectric-20
Short answer. The best amplifier for a passive subwoofer is the Crown XLS 1002: 350 W per channel at 4 Ω, RCA inputs and a crossover, and Audio Science Review recommends it for driving subwoofers. Behringer rates the NX3000D at 900 W at 4 Ω, but ASR measured 268 W at 20 Hz.
Searched as: Dayton SPA500DSP Crown XLS 1002 Behringer NX3000D passive subwoofer amplifier specifications comparison
How this table was made: each figure comes from the maker's own US product page or manual, or from the reviewer named next to it, checked 2026-11-10. Dealectric does not test units itself. Rows with a Buy link are products Dealectric lists: the links are affiliate links, and their codes are re-tested in the brand's own cart every day (last check 2026-11-13).
| Model | Maker's rating at 4 Ω | Conditions the maker states | Power to plan on, 4 Ω | Rated loads | Inputs and form | Price | Buy |
|---|---|---|---|---|---|---|---|
| Crown XLS 1002 | 350 W per channel; 1,100 W bridged (Thomann) | THD < 0.5%, no power level or band given | 350 W; Audio Science Review calls its 4 Ω power 'healthy' | 2, 4, 8 Ω: 550 / 350 / 215 W per channel (Thomann) | XLR, 1/4 in, RCA; rack box with fans | $500 on Amazon (checked 2026-11-12) | Buy on Amazon |
| Fosi Audio M03 | 200 W (spec table) or 150 W (description), same page | None; no supply voltage given | About 128 W at most on the included 32 V brick (32² ÷ 8) | 4–8 Ω | RCA in (Audiophonics); desktop box | $76.49 on fosiaudio.com, 2026-11-10 | Buy |
| Dayton Audio SPA250DSP | 250 W RMS | THD+N <0.1% | 250 W, at Dayton's stated conditions | 4 Ω is the only load Dayton rates | Balanced and unbalanced analog; plate amp, 9.25 × 6.25 in cutout | $277.98 on Amazon (checked 2026-11-12) | Buy on Amazon |
| Fosi Audio M01-BT | 220 W RMS | None stated | About 72 W at most on the included 24 V brick (24² ÷ 8) | 2–8 Ω | Bluetooth and RCA; desktop box | $89.99 (maker, 2026-11-10) | |
| Behringer NX3000D | 900 W per channel; 3,000 W bridged | None stated | About 400 W per channel, 268 W at 20 Hz (Audio Science Review) | 2 and 4 Ω; no 8 Ω figure | XLR / 1/4 in combo only; rack box, fan at full speed from power-up (Audio Science Review) | $339.00 (Guitar Center, 2026-11-10) |
What the differences mean
- The NX3000D's 1,500 W is its 2 Ω figure. Most home passive subs are 4 Ω or 8 Ω, and at 4 Ω Behringer rates it at 900 W per channel. At 20 Hz Audio Science Review measured 268 W: 268 ÷ 900 = 30% of the rating.
- The Fosi M03 is limited by its power brick. A bridged Class D output can swing at most the supply voltage across the speaker, so clean power tops out at V² ÷ (2 × R). On the included 32 V brick that is 32² ÷ (2 × 4) = 128 W into 4 Ω and 32² ÷ (2 × 8) = 64 W into 8 Ω. The brick itself supplies 32 V × 5 A = 160 W, which is below the 200 W in the spec table.
- The distortion level changes the number. TI rates the TPA3255 chip inside the M03 at 600 W at 10% THD+N but 480 W at 1%: 480 ÷ 600 = 80% of the headline. Dayton's 250 W is quoted at under 0.1%.
- The Crown can be bridged for a bigger sub. One channel gives 350 W into 4 Ω or 215 W into 8 Ω. Bridged, it gives 1,100 W into 4 Ω or 700 W into 8 Ω (Thomann listing), about 3× the single-channel figure: 1,100 ÷ 350 = 3.1.
| Your subwoofer | Fits |
|---|---|
| 4 Ω or 8 Ω home sub rated up to about 350 W, fed from an AV receiver's RCA sub out | Crown XLS 1002, one channel |
| Bigger single 4 Ω or 8 Ω sub | Crown XLS 1002, bridged (1,100 W at 4 Ω, 700 W at 8 Ω) |
| Small 4 Ω sub rated about 125 W or less, on a tight budget | Fosi Audio M03 |
| 2 Ω sub, or a dual-voice-coil sub wired to 2 Ω | Crown XLS 1002 (550 W at 2 Ω) or Fosi M01-BT (rated 2–8 Ω) |
| DIY box you are building | Dayton Audio SPA250DSP plate amp |
buy on Amazon: https://www.amazon.com/dp/B011TI97VE?tag=dealectric-20
Which watt figure to believe
A watt rating means little without its conditions: the load, the distortion level, the frequency band and how many channels were driven. Read the figure at your sub's own impedance, and trust it more when the maker states how it was measured or a named reviewer has measured it.
- Dayton SPA250DSP: 250 W RMS into 4 Ω at THD+N under 0.1%. It is the only candidate whose maker page states load and distortion together. Dayton rates no other load. buy on Amazon: https://www.amazon.com/dp/B073ZNT8HJ?tag=dealectric-20
- Crown XLS 1002: Crown's page gives 350 W per channel at 4 Ω and lists THD < 0.5% without a power level. Amir at Audio Science Review (review dated 2020-09-25) called its 4 Ω power 'healthy' and put it on his recommended list 'for non-critical applications or for driving subwoofers'. He heard none of its fans over his PC during testing. He found that a limiter holds burst power to the continuous level, and that one channel measured much worse than the other.
- Behringer NX3000D: Behringer lists 2 × 1,500 W at 2 Ω, 2 × 900 W at 4 Ω and 3,000 W bridged into 4 Ω, with no conditions. Amir at Audio Science Review (2020-07-06) measured about 400 W per channel into 4 Ω with both channels driven, falling to 268 W at 20 Hz. He wrote that the rated numbers only make sense with one channel driven.
- Fosi Audio M03: Fosi's page gives 200 W RMS at 4 Ω in its spec table and 150 W RMS at 4 Ω in its description, with no supply voltage for either. Fosi states: 'The package comes with a 32V/5A power supply, you need a more powerful power supply to get the MAX power output.' Size it to a sub rated around 125 W at 4 Ω on the stock brick. $76.49: https://dealectric.com/go/fosi-audio-m03-subwoofer-amplifier
The Dayton and Fosi figures above are the makers' own. We know of no bench test of either by a named reviewer.
Not recommended
Behringer NX3000D for a living room. Its fan 'is not temperature sensitive and wails away upon power up' (Audio Science Review). It has only XLR / 1/4 in combo inputs, so an AV receiver's RCA sub out needs an adapter. At 20 Hz it measured 268 W against its 900 W rating. Amir concluded it is 'not my cup of tea for home use so I can't recommend it'. It suits a PA rig, where fan noise doesn't matter, better than a home theater.
Sources
- Crown XLS 1002: 350 W per channel at 4 Ω, XLR/1/4 in/RCA inputs, 1.4 / 0.775 Vrms sensitivity, band-pass filter, PureBand crossover, PeakX limiters, fans (read 2026-11-10) — www.crownaudio.com
- Crown XLS 1002: 550 / 350 / 215 W per channel at 2 / 4 / 8 Ω; 1,100 W bridged at 4 Ω, 700 W at 8 Ω (read 2026-11-10) — www.thomannmusic.com
- Audio Science Review, Crown XLS1002 review (2020-09-25): 4 Ω power 'healthy', recommended for driving subwoofers, fans inaudible, limiter, channel mismatch (read 2026-11-10) — www.audiosciencereview.com
- Audio Science Review, Behringer NX3000D review (2020-07-06): about 400 W per channel into 4 Ω, 268 W at 20 Hz, fan at full speed from power-up, XLR/1/4 in inputs only, not recommended for home use (read 2026-11-10) — www.audiosciencereview.com
- Behringer NX3000D: 2 × 1,500 W at 2 Ω, 2 × 900 W at 4 Ω, 3,000 W bridged at 4 Ω, no stated conditions, XLR/TRS combo inputs, limiters and protection (read 2026-11-10) — www.behringer.com
- Behringer NX3000D price, $339.00 (read 2026-11-10) — www.guitarcenter.com
- Fosi Audio M03: $76.49 (compare-at $89.99), 200 W / 150 W RMS at 4 Ω, 4–8 Ω load, 32 V/5 A brick, Fosi's statement on the power supply (read 2026-11-10) — fosiaudio.com
- Fosi Audio M03 RCA input and subwoofer output (read 2026-11-10) — www.audiophonics.fr
- TI TPA3255 (the chip in the M03): 600 W at 10% vs 480 W at 1% THD+N into 2 Ω PBTL; 18–53.5 V supply (read 2026-11-10) — www.ti.com
- Dayton Audio SPA250DSP: 250 W RMS into 4 Ω at THD+N <0.1%, 9.25 × 6.25 in cutout, inputs, PC DSP software, auto standby (read 2026-11-10) — daytonaudio.com
- Fosi Audio M01-BT: $89.99, 2–8 Ω, 220 W RMS at 4 Ω, Bluetooth and RCA inputs, 24 V/4.5 A supply (read 2026-11-10) — fosiaudio.com
- Crown warranty: 3 years for 'All other Crown models' (Xli Series and B-stock 1 year); new from an authorized Harman Professional dealer in the US, original dated bill of sale, not transferable; repair, exchange or refund at Harman's discretion (read 2026-11-10) — www.crownaudio.com
- Dayton Audio SPA250DSP product details: Warranty - Parts 5 Years, Warranty - Labor 5 Years (read 2026-11-10) — daytonaudio.com
- Dayton Audio support: products free from defects in material and workmanship for 5 years from date of purchase, repair or replace with new or factory-refurbished unit; excludes misuse, abuse, neglect, accident (read 2026-11-10) — daytonaudio.com
- Amazon Return Policy: most items returnable within 30 days of delivery; most items bought Nov 1–Dec 31, 2026 returnable through Jan 31, 2027; seller-fulfilled returns go back to the seller (read 2026-11-10) — digprjsurvey.amazon.com
Published 2026-11-10; updated 2026-11-10. The buy links are affiliate links; see the disclosure. Corrections welcome at [email protected] or /feedback.