Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

Brand:| Model: SPA250
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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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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
    (144 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 4.5208 out of 5 by 144.
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
Rated 5 out of 5 by from Great Replacement AmpI have an old Dayton SUB-100 and the plate amp finally died, the SPA250 fits it perfectly without mods! The 250 watts breathes new life into this cheap sub, the old amp was only rated at 125 watts. There is a slight hum but it's very faint, my old plate amp was worse. They must of fixed the power-cord because mine is tight, I had to force it into the socket.What it comes with:Screws, foam tape insulation, 5ft power cord.P.S. the SPA250 will also fit the Dayton SUB-120.
Date published: 2015-02-10
Rated 5 out of 5 by from Easy and Solid!I built a 3.1 cubit foot box, w/ a 3 in. long 1.5 in. diameter tube vent to tune to approximately 29 Hz using the DC305-4 12 in. Dayton subwoofer. It sounds much better than my Acoustic Research 12 in. subwoofer. I have had it about one month and very pleased with it.
Date published: 2015-02-08
Rated 2 out of 5 by from SPA250 plate ampI bought this two weeks ago and return it today for exchange. The amplifier is not working.
Date published: 2015-02-07
Rated 4 out of 5 by from mine has a slight hum when turned on.Ordered this and received it the next day, very fast shipping. This amp has a slight hum when turned on , I tried plugging it in various wall outlets as the instructions suggested but could not get rid of the hum. The amp does play very well and I am sound quality is good.
Date published: 2015-02-05
  • 2015-02-25T06:33CST
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Product Q&A

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who own this product or have experience with it.
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Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

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

SPA250 250 Watt Subwoofer Plate Amplifier. I have an ADS C10PS, the amp has been fixed once recently, $230 Grrrrrr. I am wondering if this amp would be a good replacement. It appears the amp is 5 inches deep. I need some direction here.

Asked by: Philip3061
The depth of this amp includes the heat sinks, so the actual mounting depth is about 3-1/2". This requires an opening of 8-1/2" square, so if the cabinet has this size opening or you don't mind modifying it, and the woofer is 4 ohm, this amp should work fine.
Answered by: MattP
Date published: 2015-01-27
  • 2015-02-25T09:51CST
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