Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

Brand:| Model: SPA250
Product Video
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.
A restocked/refurbished, or Open Box unit of the product is available -- see it now
  • 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
Part # 
Weight: 13.4 lbs.  
List Price$199.99
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Your Price
Buy 4-up$128.50
Part # 300-803
Qty:  EA
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Product Details

Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

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.

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.

• 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
    (147 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.

View similar products to the Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier
in the Subwoofer Plate Amplifiers product category.


Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier
Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier is rated 4.4797 out of 5 by 148.
Rated 1 out of 5 by from Not so goodHad this amp for couple years of light duty driving 2 peerless 10 inch subs then, poof! never played it past half gain. disapointed.
Date published: 2015-03-28
Rated 5 out of 5 by from Exact replacement!My Castle subwoofer gave up the ghost and left me high and dry. I needed an exact drop-in replacement and it had to be multi-voltage as I'm stationed in Germany and we have 220 volts here. Well, this is my first purchase with Parts Express and I could not be more pleased. The plate amp works great and it also came with an extra 100 watts of power than the old one. Super! I hope to get several more productive, fun-filled years out of my refurbished Castle subwoofer.
Date published: 2015-03-13
Rated 4 out of 5 by from Nice Amp But Careful With SizeI bought this for a blown Hsu VTF-2 MK3 unit instead of paying double the price for a new Hsu amp. The base plate overall is abut 3/16 shorter than the Hsu cutout, so the exact holes don't match and you have put in screws at an angle to assure a tight fit. It's still a good option but be aware of the inexact fit.
Date published: 2015-03-13
Rated 2 out of 5 by from Quality Control IssuesI ordered this product to replace the amplifier in a 12" Cerwin Vega sub that expired. Right out of the box the power cord did not fit the socket on the amp. Plenty of other reviews state the same issue. I used the cord off an old computer power supply and connected everything to test it before hacking up my enclosure to mount it. Immediately I heard lots of popping, crackling, and midrange frequencies making it through the crossover. PE was great at replacing the faulty product with no hassles. The second amp arrived with the exact same power cord issue. PE really needs to call up the factory in China and get the right cords then repackage the ones they currently have in stock to remedy this issue. This time the amp did work as intended and seems to have plenty of power. Now it's time to cut up my box to make it fit.
Date published: 2015-03-01
Rated 3 out of 5 by from You get what you pay for.I purchased two of these to run 3 Aura bass shakers each. One has a hum, one is silent. Both of them had power cords that literally fell out of the socket if not held in. I had to use two other cords that ended up fitting snug. Overall, they performed well for the money and application. These are budget amplifiers, and the quality unfortunately reflects that.
Date published: 2015-02-17
Rated 5 out of 5 by from Powerful amp!I just recently purchased this amp and let me just say I was very shocked from the power it pushes to my 15" power bass sub! Rockin the house!
Date published: 2015-02-12
  • 2015-03-29T06:27CST
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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 tech@parts-expresss.com  for a prompt reply.
Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

Planning on using 2 of these amps, each driving a 4 Ohm sub in a stereo setup. I want to use the high level inputs, would I need to run a jumper wire from the L to the R high in to get the full amplifier output?

Asked by: Karl5150
You will not need a jumper to get full output from this amplifier.
Answered by: MattP
Date published: 2015-03-27

Bought 2 of these to power 4 AST-2B-4 shakers each. I plan to run them through a Russound sdb-4.1 speaker selector to cut out pairs of shakers not in use. How do I mount this amp in a shelf audio rack and how do I wire all to my Pioneer SC-85 receiver?

Asked by: JPK36
Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-02-24

Would this be a better amp than the bash 300 for a 15" ported sub for home theater? They are close to the same price, but I would like quality over 50watts. Are they about the same quality, or is one more dependable? 

Asked by: bcboyz86
I doubt you will hear any difference between these amplifiers. The additional 50 watts will be hardly beneficial as well. We sell an equal number of these amplifiers and both have the same warranty period, but we can repair Dayton amplifiers should something happen once the warranty is up. We cannot repair Bash amplifiers.
Answered by: MattP
Date published: 2015-02-23

Will this work with an M&K MX-90? The wattage seems more than enough, and the plate size matches. I haven't opened my unit but the sub has 2x 12" drivers in push pull.

Asked by: mikazuki5
As long as the load to the amplifier is no less than 4 ohms and the size matches up it should work well as a replacement.
Answered by: MattP
Date published: 2015-02-11

Which plate amp will fit an Infinity BU-120 subwoofer? 6 1/16"H x 7 1/2"W

Asked by: MMIIKKEE
Unfortunately we do not have anything that will be a drop in fit for that subwoofer. The closest would probably be the Bash 300 which requires a cutout of 10" x 6-1/4".
Answered by: MattP
Date published: 2015-02-11

Will this amplifier work with a Bic PL-200? and is it enough power for it? ( 250 watts rms) (1000 watt peak)

Asked by: Evan08
This should work perfectly fine as a replacement for that subwoofer. You will probably have to modify the enclosure to get it to fit properly.
Answered by: MattP
Date published: 2015-01-29
  • 2015-03-29T06:32CST
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