Dayton Audio SPA250 250 Watt Subwoofer Amplifier
Dayton Audio SPA250 250 Watt Subwoofer Amplifier

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Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

Brand:|Model: SPA250
Engineered to provide flexibility, ample power, and reliability, the Dayton Audio SPA250 delivers high fidelity subwoofer amplification and is tailored for home audio and home theater audio systems.
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List Price$199.99
Regular Price$139.80
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Part # 300-803
  • Switchable 6 dB @ 35 Hz bass boost
  • Mono Class AB output stage for solid, well defined output
  • Low-level and high-level 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
  • Switchable 120/240V input voltage
  • Energy efficient—draws less than 1 watt in stand-by mode

Product Details

Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

Bass boost or flat…you choose and the SPA250 delivers!

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. A user-configurable bass boost circuit creates a 6 dB peak at 35 Hz, which allows sealed subwoofer designs and certain ported enclosures to achieve their optimum bass extension and maximum "flat" output.

Connects to almost any home audio system, and does it with ease

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 amp can accept a stereo input signal and combine it into mono, which is preferred for sub bass reproduction. A preamp or receiver's LFE output may be connected to the SPA250's Left (mono) input. 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.

We haven't run out of great features to talk about

• Variable low-pass filter at 24 dB/octave attenuation from 40 Hz ~ 180 Hz
• Switchable phase 0° (NOR) or 180° (REV)
• Variable gain MIN/MAX input voltage dependent
• Speaker level high-pass outputs 6 dB/octave at approximately 180 Hz @ 4 ohms, 90 Hz @ 8 ohms (i.e. 220 uF electrolytic capacitor)
• Line-level full bandwidth (10 Hz- 20 kHz) outputs/throughputs for adding or "daisy chaining" additional amplifiers
• Subsonic filter 12 dB/octave high-pass filter centered at 20 Hz
• Damping factor at rated power: 114 @ 100 Hz

Specifications: • Measured power output: 156 watts RMS into 8 ohms @ 0.1% THD, 252 watts RMS into 4 ohms @ < 1.0% THD • Signal to noise ratio: 90 dB A-weighted • Input impedance: 10.4K ohms • Bass boost: Switchable, 6 dB @ 35 Hz • Low pass adjustment: 40 Hz to 180 Hz • Phase adjustment: 0º (normal) 180º (reverse) • Power requirements: Switchable, 115/230 VAC, 50/60 Hz • Dimensions: 9-13/16" W x 9-13/16" H x 5" D • Cutout dimensions: 8-1/2" W x 8-1/2" H.

Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier
  • BrandDayton Audio
  • ModelSPA250
  • Part Number300-803
  • UPC844632094897
  • Product CategorySubwoofer Plate Amplifiers
  • Unit of MeasureEA
  • Product Rating
    (162 Reviews)
  • Weight13.4 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier
Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier is rated 4.4506 out of 5 by 162.
Rated 5 out of 5 by from Great Product. Exceeded My Expectations!After experiencing intermittent problems with my 10 year old HSU Research VTF-2 subwoofer, it was determined that the amplifier had failed. I was faced with the issue of purchasing or upgrading to a brand new sub, or replacing the amplifier, based on the advise of HSU tech support. After researching some of the popular home theater forums, I learned that the Dayton Audio SPA250 plate amplifier was a recommended replacement for the VTF-2 amplifier. It fit perfectly, as if it was made specifically for the HSU product. The screws lined up exactly with the subwoofer cabinet, the wires easily attached to the driver, and the entire installation took no more than 15 minutes. Added bonus - the price was $75 cheaper than the HSU replacement amp with free shipping, and it has 100 watts more power than the HSU amp. The HSU VTF-2 even sounds better, with a clearer, tighter sounding bass. Couldn't be happier!!
Date published: 2015-11-19
Rated 3 out of 5 by from Great amp! poor case...I bought this amp to replace a blown one on a Speakercraft Bassx dual 8 subwoofer someone gave to me. After I modified the box to accept the amp, I installed it as it was shipped to me, and tested it in my system. I immediately noticed a buzzing noise, even at low volumes, from the plastic inside case of the amp vibrating, and causing air to leak around and through the connections, switches, and heatsink on the back of the amp. I ended up removing the inside case and using black silicone to seal everything up. I reinstalled the amp without the plastic inside case, since it wasn't stiff enough to do anything anyway. The amplifier functions great now after several hours of chasing leaks.I would recommend a separate chamber to be built into a box if I were building one from scratch and using this amp.
Date published: 2015-11-03
Rated 5 out of 5 by from sledge hammerthe last two amps i owned were spa240 watt and they shook my brick and cement garage. i now bought two of these spa250 watt plate amps and the garage is moving like an earthquake. I have the two amps powering two speaker boxes with car subwoofers, 4 ohm a piece, two subs per box wired in parallel at 2 ohms. the amps are rated at 4 ohms but handle 2 ohms no problem raising the watts to 500 per speaker box. i run whisper fans on top of each amp blowing straight up which keeps the amps just warm and for the high passed speakers i have two clarion 6 x 9 five way car speakers which are crystal clear.
Date published: 2015-11-02
Rated 1 out of 5 by from Not reliableI have bought three of these over the last few years. Two have failed with either a loud popping noise, or just a silent failure. The third is still running. One out of three is not acceptable, so I will be looking at other items for replacement.
Date published: 2015-10-31
Rated 4 out of 5 by from Great replacement partReplaced the blown amp in my home powered infinity sub with this amp. Barely fit after I did a big cutout. But it sounds great. I think it sounds even better, and is a little higher power. Big fins to keep it cool. Should last a long time!
Date published: 2015-10-26
Rated 5 out of 5 by from Great ampUsed to replace the burned out factory amp on my JBL 12 inch subwoofer and it works great. Awesome amp. Easy to install and it will rattle the windows. My old sub sounds better than it did when it was new. Replacement cost would have been over $600 and this amp rocks.
Date published: 2015-10-19
  • 2015-12-01T06:37CST
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  • cp_1, bvpage1
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Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email  for a prompt reply.
Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

Would this amp be a suitable replacement for a Rel T 2 subwoofer? Thanks, Dave

Asked by: arcothunder
This requires a bit more information in order to proceed. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-11-30

I have a proficient PS12 what amp pack will fit in the BOX in place of the bad one?

Asked by: larry223344

I have full-range speakers. How would I connect the audio from my AV receiver to the plate amp. I want to make sure only lows go to the subs and highs and mids go to proper speakers using bi-wire/amp jack. what happens to the wires on back of amp?

Asked by: rome

Whats the max or safe amount of watts that can be played though the high level in jacks? i would need it to be able to handle 100W

Asked by: Bassbalaster505
The high level input jacks don't have a specific power rating, but they will not have any issues with 100 watts.
Answered by: MattP
Date published: 2015-11-12

Can i use this to power a full range speaker system as powered monitor at the same specs?

Asked by: Keek
This amplifier is low pass only, it will not work full range.
Answered by: MattP
Date published: 2015-11-11

If i wire my main amp to this amps from amplifier jacks then run the to speakers jack to my main speaker will the main speaker still be full range or will they be crossed over and will they Impedance still be the same as the main speakers?

Asked by: Bassbalaster505
The speaker level outputs are high passed with a capacitor. The impedance of the speaker will not change.
Answered by: MattP
Date published: 2015-11-04
  • 2015-12-01T07:16CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_138
  • loc_en_US, sid_300-803, PRD, sort_recentQuestionsFirst
  • clientName_PartsExpressInternational


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