--- product_id: 1168377 title: "SPA250 250 Watt Subwoofer Plate Amplifier" brand: "dayton audio" price: "£228.58" currency: GBP in_stock: true reviews_count: 13 category: "Dayton Audio" url: https://www.desertcart.co.uk/products/1168377-spa250-250-watt-subwoofer-plate-amplifier store_origin: GB region: United Kingdom --- # 250W peak power output Switchable 6 dB bass boost @ 35Hz Variable gain & crossover controls SPA250 250 Watt Subwoofer Plate Amplifier **Brand:** dayton audio **Price:** £228.58 **Availability:** ✅ In Stock ## Summary > 🎵 Unleash the bass beast with precision power! ## Quick Answers - **What is this?** SPA250 250 Watt Subwoofer Plate Amplifier by dayton audio - **How much does it cost?** £228.58 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/1168377-spa250-250-watt-subwoofer-plate-amplifier) ## Best For - dayton audio enthusiasts ## Why This Product - Trusted dayton audio brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Tailored sound, your way:** Adjust gain, crossover, and phase controls to perfectly integrate with your unique setup. - • **Power that commands the room:** Delivers up to 252W RMS into 4 ohms for deep, punchy bass that fills any space. - • **Seamless system compatibility:** Low-level, high-level, and LFE inputs plus manual, auto, or triggered on/off modes for effortless connectivity. - • **Built to last, designed to fit:** Compact metal chassis with exact mounting specs for easy replacement and long-term reliability. - • **Bass boost for the bass connoisseur:** Switchable 6 dB boost at 35 Hz lets you dial in that extra low-end punch when you need it. ## Overview The Dayton Audio SPA250 is a robust 250-watt Class AB subwoofer plate amplifier featuring versatile input options, customizable sound controls, and a switchable bass boost. Designed for easy integration and replacement, it delivers clean, powerful bass with minimal distortion, making it the go-to upgrade for audiophiles seeking professional-grade low-frequency performance. ## Description Product description Engineered to provide flexibility, ample power, and reliability The Dayton Audio SPA250 subwoofer amplifier produces 250 watts of clean power output, and combines with a host of flexible user options to make it an unbeatable choice. The SPA250 features RCA line level and banana jack speaker level inputs and outputs, automatic power-on that is triggered by any audio input signal, and a phase reverse switch to match the subwoofer to your room and your other speakers. A single SPA250 can accept a stereo input signal and combine it into mono, which is preferred for sub bass reproduction. The internal low pass crossover is fully adjustable between 40 and 180 Hz, and of course the amp has built-in protection against internal and external faults. Channels: 1 Power Output @ 4 ohms (RMS): 250 Watts Power Output @ 4 ohms (MAX): 500 Watts Frequency Response: 20Hz - 180Hz Inputs: 2x RCA Inputs, 2X High-level inputs Outputs: 1x Powered Output, 2x RCA Outputs, 2x High-level Phase Switch Correct misalignment between your speakers and your subwoofer with a phase inversion switch Auto-On When no signal is present, the SPA250 can shut itself off until you need it most! High-Level In/Out High-Level inputs and outputs let you use any amplifier to feed the SPA250 and send it out to the full range outputs. Perfect for systems with no subwoofer output Variable Crossover Maintain a smooth transition from your full-range speakers with a variable low-pass filter. Class-AB Reliability The classic AB topology keeps distortion to a minimum while providing a peak wattage of 500W to your driver. the SPA250 is perfect for subwoofer duty due to its low noise and reliable performance and protection features. A-Class Features On the SPA250, the input and output connections are through your choice of either line level RCA connectors, or high-level inputs for maximum compatibility. A stereo input signal is summed to mono and sent to the internal low pass crossover, which is selectable from 40 to 180 Hz; the input gain sensitivity is fully adjustable as well. Also included is a phase reverse switch, which helps you to achieve the best acoustical match with the rest of your speakers. A large surface area heat sink is combined with internal overload, thermal, and short circuit protection so that you can expect years of reliable operation. 1. Low-Level Inputs (Left/Right) - RCA Style jacks that will accept standard line level inputs from a pre-amp level source. 2. Low-Level Outputs (Left/Right) - RCA Style jacks that will pass the line level inputs through 3. High-Level Inputs - Accepts speaker level inputs for connection to amplifiers with no pre-amplified subwoofer output. 4. High-Level Passthrough - allows the speaker level input signal to be passed through to their intended speakers. 5. Power Input - Built-in power cord for connection to 120VAC mains. 6. Volume (Gain) - This control will match the amplifier's input sensitivity to the output of the pre-amp source 7. Frequency (Low-pass crossover) - This sets the highest frequency the subwoofer will reproduce and has a range between 40-180Hz with a slope of 24dB/Oct. 8. Power LED - When the power switch is moved to the “on” position, the LED will illuminate green, and the amp will be in “On” mode. If the protection circuit detects a short circuit or thermal overload the unit will shut down and the LED will turn red 9. Power Switch - On, Off and Auto mode. When the “Auto” position is selected, the amp is in “stand by” mode until an input signal of about 10 mil livolts or greater is detected. The amp will go back to standby mode 10-15 minutes after the input signal stops 10.Phase - This two-position (NOR = 0° phase and REV = 180° phase) switch helps to compensate for differences in the acoustical and electrical characteristics between the subwoofer and the main system speakers. 11. Voltage Selection - Selects 115V or 230V Functionality 12. Amplified Signal Output - Solderless disconnect terminals for driver connection: Red = 0.25" / Black = 0.205". Shop More Plate Amps Build your own high-quality integrated powered subwoofer speaker system, or upgrade an existing setup. The performance and features of the amplifier solutions found at Parts Express far exceed those of many similar products. These amps are designed to "do it all" when matched with the appropriate subwoofer enclosure and loudspeaker driver. Review: Excellent Dayton Audio SPA250 - 250 Watt Subwoofer Amp. Excellent Calue ! - Awesome Crisp Clean Power: Dayton Audio SPA 250 - 250 Watt Subwoofer Amp. This unit is used in-line with my REAR ... Speakers 'B' Speaker Wires. Very Simple Set-Up: Speakers L/R Input and Output ... and a Dedicated Single Pair of Speaker Wires [16"] for the Subwoofer Speaker. I am using a Pyle PDIWS28 - Dual 8" In-Wall unit which can Peak at 600-watts ... and Continuous usage @ 300-watts. The SPA250 has GAIN / Frequency Response / and Phase switches - adjustments. The 'Auto on/off switch is left on at all times ... shuts the unit down when power from the Amp is turned off. Very useful feature. A Bass Boost Switch on top --- Selects a bass boost filter with +6dB @ 35Hz. It Allows the user to add boost to the low end response. Nice feature. This unit is designed to fit within a Subwoofer cabinet / enclosure. Mine is built into a Custom Rear [back of family room] Enclosure with L / R Rear Speakers. The Bass resonating from the power of this amp nicely Compliments / Enhances the Front / Main [Bose] Subwoofer. The entire room is literally filled with Music. Front Speakers are positioned lower to the floor ... rear speakers are closer to the ceiling ... total coverage at all volume levels. I chose this unit because my Receiver does not have a Rear or Second Subwoofer connection. This is truly an Awesome Amp ... Simple and Efficient ! Worth the Money -- Excellent Value ! Review: Good replacement for B&W Sub. - Good replace for my B&W sub. The holes lineup but needed to be drilled out a little bigger. Sounds good. ## Features - Switchable 6 dB @ 35 Hz bass boost Measured power output: 156 watts RMS into 8 ohms @ 0.1% THD, 252 watts RMS into 4 ohms @ < 1.0% THD - Mono Class AB output stage for solid, well defined output - Low-level, high-level, and LFE inputs connect to any system - Manual, auto, or triggered on/off modes for compatibility with any automated system - Variable gain, crossover point and switchable phase controls optimize room integration ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0070Z81MW | | Best Sellers Rank | #78,579 in Electronics ( See Top 100 in Electronics ) #183 in Audio/Video Receivers & Amplifiers | | Brand | Dayton Audio | | Brand Name | Dayton Audio | | Customer Reviews | 4.3 out of 5 stars 238 Reviews | | Global Trade Identification Number | 00844632094897 | | Included Components | Subwoofer plate amplifier, power cord, user manual | | Item Dimensions | 5.12 x 9.84 x 9.84 inches | | Item dimensions L x W x H | 5.12 x 9.84 x 9.84 inches | | Manufacturer | Dayton Audio | | Maximum Output Power | 252 watts | | Model | SPA250 | | Mounting Type | Tabletop Mount | | Number of Channels | 1 | | Output Power | 250 Watts | | Part Number | 300-803 | | UPC | 844632094897 | | Unit Count | 1.0 Count | | Voltage | 120 Volts (AC) | ## Product Details - **Brand:** Dayton Audio - **Item dimensions L x W x H:** 5.12 x 9.84 x 9.84 inches - **Manufacturer:** Dayton Audio - **Mounting Type:** Tabletop Mount - **Voltage:** 120 Volts (AC) ## Images ![SPA250 250 Watt Subwoofer Plate Amplifier - Image 1](https://m.media-amazon.com/images/I/81IAj7sCb9L.jpg) ![SPA250 250 Watt Subwoofer Plate Amplifier - Image 2](https://m.media-amazon.com/images/I/816ZgTEXVwL.jpg) ![SPA250 250 Watt Subwoofer Plate Amplifier - Image 3](https://m.media-amazon.com/images/I/71scU6xSJ2L.jpg) ![SPA250 250 Watt Subwoofer Plate Amplifier - Image 4](https://m.media-amazon.com/images/I/71jaeqP2r0L.jpg) ![SPA250 250 Watt Subwoofer Plate Amplifier - Image 5](https://m.media-amazon.com/images/I/71h+D8pFheL.jpg) ## Questions & Answers **Q: What are the dimensions, trying to replace amp on a klipsch rpw10** A: The specs are on the Dayton Audio website. The SPA-250 page is here:http://www.daytonaudio.com/index.php/spa250-250-watt-subwoofer-amplifier.htmlOverall dimensions are listed in the spec table near the bottom of the page. Cutout dimensions are in the last paragraph of the text portion of that page. The cutout dimensions should be 8.5" x 8.5". Be aware that the amplifier unit is 5" deep, and may require trimming of the internal baffles of a subwoofer cabinet. **Q: Is this amp stable down to 2 ohms?** A: probably not **Q: Can I power a driver in the front and shakers from the back using the high level outputs at the same time? The bass shakers are two ohm buttkicker min** A: The outputs are a by-pass of the inputs. The idea of this amp is to send full frequency audio (20 -20kHz) in and full audio out. The plate amp strips off low frequencies (below 200 Hz) for a subwoofer or shakers. So assuming full spectrum audio in, you would not want shakers on the high outputs. If you did this, the shakers would be shaking most of the time which would be very annoying. As far as impedance, you must normally keep the load between 4 and 8 ohms. (This depends on the amplifier’s design.) So if you have 2 ohm shakers, you would connect 2 in series to get 4 ohms. (Ohms law). **Q: Low frequency ranges. Will it do 32hz** A: It should do 32Hz quite well. With a test cd, mine had no problem at 16Hz although the subwoofer was moving air but difficult to hear. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excellent Dayton Audio SPA250 - 250 Watt Subwoofer Amp. Excellent Calue ! *by J***B on June 14, 2016* Awesome Crisp Clean Power: Dayton Audio SPA 250 - 250 Watt Subwoofer Amp. This unit is used in-line with my REAR ... Speakers 'B' Speaker Wires. Very Simple Set-Up: Speakers L/R Input and Output ... and a Dedicated Single Pair of Speaker Wires [16"] for the Subwoofer Speaker. I am using a Pyle PDIWS28 - Dual 8" In-Wall unit which can Peak at 600-watts ... and Continuous usage @ 300-watts. The SPA250 has GAIN / Frequency Response / and Phase switches - adjustments. The 'Auto on/off switch is left on at all times ... shuts the unit down when power from the Amp is turned off. Very useful feature. A Bass Boost Switch on top --- Selects a bass boost filter with +6dB @ 35Hz. It Allows the user to add boost to the low end response. Nice feature. This unit is designed to fit within a Subwoofer cabinet / enclosure. Mine is built into a Custom Rear [back of family room] Enclosure with L / R Rear Speakers. The Bass resonating from the power of this amp nicely Compliments / Enhances the Front / Main [Bose] Subwoofer. The entire room is literally filled with Music. Front Speakers are positioned lower to the floor ... rear speakers are closer to the ceiling ... total coverage at all volume levels. I chose this unit because my Receiver does not have a Rear or Second Subwoofer connection. This is truly an Awesome Amp ... Simple and Efficient ! Worth the Money -- Excellent Value ! ### ⭐⭐⭐⭐⭐ Good replacement for B&W Sub. *by D***R on March 24, 2026* Good replace for my B&W sub. The holes lineup but needed to be drilled out a little bigger. Sounds good. ### ⭐⭐⭐⭐⭐ Quality product *by S***R on March 25, 2026* Great amp works perfectly and stays cool ## Frequently Bought Together - Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier - FosPower Y Adapter (8 inch) 2 RCA (Male) to 1 RCA (Female) Stereo Audio Y Adapter Subwoofer Cable (24k Gold Plated) 2 Male to 1 Female Y Splitter Connectors Extension Cord --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/1168377-spa250-250-watt-subwoofer-plate-amplifier](https://www.desertcart.co.uk/products/1168377-spa250-250-watt-subwoofer-plate-amplifier) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-03*