Products › Amplifiers › Dayton Audio
Dayton Audio SPA250DSP 250W Subwoofer Plate Amplifier with DSP
A plate amp that mounts in the subwoofer's own cabinet. It is the only candidate here whose maker rating states load and distortion together: 250 W RMS into 4 Ω at under 0.1% THD+N.
Sold on Amazon.com, no code needed
Price: $277.98 on Amazon (checked 2026-11-12); Amazon's price can change, and the Amazon page has the current one. Specs below were verified on Dayton Audio's site 2026-11-10.
Discount code: none; Dealectric has no Dayton Audio code, and any Amazon coupon shows on the Amazon page itself.
Buy: https://www.amazon.com/dp/B073ZNT8HJ?tag=dealectric-20 — opens the Dayton Audio SPA250DSP 250W Subwoofer Plate Amplifier with DSP listing on Amazon.com at no extra cost.
Warranty: 5 years on parts and 5 years on labor from the date of purchase. Dayton Audio repairs the amp or replaces it with a new or factory-refurbished unit. Misuse, abuse, neglect and accidents are not covered.. Returns: Through Amazon: most items can be returned within 30 days of delivery. Items bought Nov 1 to Dec 31, 2026 can be returned through Jan 31, 2027. If a third-party seller ships the order, the return goes to that seller.. Affiliate program: Amazon Associates; tracking cookie: 24 hours. As an Amazon Associate, Dealectric earns from qualifying purchases. All Dayton Audio codes, including the ones the store rejected: Dayton Audio discount codes.
Machine-readable record: /offers.json, id = "dayton-audio-spa250dsp".
Specifications
| Power | 250 W RMS into 4 Ω, THD+N <0.1% |
|---|---|
| Mounting cutout | 9.25 in H × 6.25 in W |
| Unit size | 10.25 × 7.25 × 2.125 in |
| Inputs | Analog balanced and unbalanced |
| Output | Line-level high-pass output |
| DSP control | PC-based GUI software; single-knob LCD on the plate |
| Auto standby | After 20 min without signal, typically wakes within 1 s |
Model: SPA250DSP. Figures are from the manufacturer's official product page unless a caveat says otherwise.
Compared side by side
The Dayton Audio SPA250DSP 250W Subwoofer Plate Amplifier with DSP appears in this table next to models from other brands:
Who it's for
A DIY 4 Ω subwoofer box you are building or can cut to fit the plate.
Caveats
- Needs a 9.25 × 6.25 in cutout, so it does not suit a finished passive sub without rework.
- Dayton rates it only into 4 Ω.
- Full DSP access needs the PC software.
Affiliate link: if you buy through it, the merchant pays us a commission at no cost to you; that commission pays for the cart tests behind every code here. Price, availability and each code were checked on the merchant's own US store on the dates shown; they change, so the store's checkout is the source of truth. Full disclosure.