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

Manuals & Resources

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.
In Stock
Regular Price$139.80
Sale Price
Dayton Audio Baseball Cap
Qty: 1Part # 520-308
List Price:$19.99
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
    (156 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 4.4744 out of 5 by 156.
Rated 5 out of 5 by from Perfect replacement for Cambridge Soundworks!I bought this as a direct replacement for a Cambridge Soundworks Bass Cube 12. The sub and box were in mint condition and I didn't want to spend a fortune on a new sub. I tried replacing the blown capacitor in my OEM amp but the board appeared to be too badly damaged. This plate amp was an absolute perfect fit...literally screwed it in (even the screw holes matched perfectly!) and had instant bass for my home theater. Very economical fix!
Date published: 2015-09-15
Rated 5 out of 5 by from Direct ReplacementI used this amp as a Direct replacement for a Optimus PRO-SW200P, Cat #40-4081.Daytobn Audio 240 Watt Subwoofer Plate Amplifier, SA240/SA240-B.I have had this sub for many years and the original amp started making crazy noises and after checking all the connections I decided to swap out the amp. This Daytona AMP was a direct fit with no modifications. All screw holes lined up perfectly. I'm glad I purchased this amp and would do so again. Works and sounds perfect.
Date published: 2015-09-07
Rated 5 out of 5 by from Dayton SPA250 Retro Fit for JBL Venue 12 enclosureI needed a small sub for my garage to go with my old school McIntosh C32 preamp, MC2205 Power amp and ADS L810 speakers. I had this blown JBL Venue 12 with a blown plate but perfect cabinet and subwoofer. A little jigsaw time and I had a great sounding sub for little money. You do have to make a small wood patch (bottom right) Great Sounding!
Date published: 2015-09-02
Rated 5 out of 5 by from Sounds Great!I bought this amp several years ago. I have two small satellite spekers and use this to fill in the lows. Currently hooked up to a JL Audio 10" Sub in a sealed enclosure. It works great and has plenty of punch for the music we listen to.
Date published: 2015-08-18
Rated 5 out of 5 by from Pefect drop in replacment for KLH SubI purchased this from a parts express eBay listing to replace the burnt up amp in my old KLH subwoofer fit perfectly even the screw holes lined up. Its been years since I listened to the sub in new condition the sub sounded dull and shoddy for some time before it burnt out but I am certain it sounds better than when I bought it new, been using it for a couple of months now no issues.
Date published: 2015-07-15
Rated 4 out of 5 by from Nice Plate AmpI'll start off with the review stating that the first one I received was DOA. As soon as it was plugged in it started to hum threw the speaker outputs fairly loud even switched to the "Off" position. The humming would reduce once switched to "On". I tried playing music through it even with the humming and the bass was completely distorted. Note that this amp had no bass boost switch and didn't have the computer style plug in power cord. It was a cord that was wired to the unit. (The one pictured below, note that I don't have a picture of the one that wasn't DOA)Now the second unit I received was as expected. (I should note that PE's customer service is very good. Some of the best customer service I have had from a website.) No noise while no music was being played. The auto turn on works as expected. This one had the computer style power cord and the bass boost switch, which is rather comical where it is placed. If you have your cut out for the plate amp on the box fairly snug, the cap for the bass boost will get in the road. You'll have to pop it off before you insert the amp and then put it back on once the amp is mounted. It has great output. I should go and test to see its true wattage with my AMM.1. If I do I will comment onto this review. It does get a bit warm when I was playing music with heavy bass lines in it. But it stays luke warm when watching movies. In the end I am pleased with the unit now that I have one that is functional. It would receive 5 stars if I didn't get a defective one off the batt.
Date published: 2015-06-29
  • 2015-10-05T06:56CST
  • bvseo_cps, prod_bvrr, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_156
  • loc_en_US, sid_300-803, PRD, sort_mostRecent
  • clientName_PartsExpressInternational

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

Is this amp completely enclosed on the interior side?  Is it ok with not getting any cooling from the interior faces, and will reject all heat through the heat sink on the exterior?  Reference my review of the BASH300 failure in this application.  Thanks!

Asked by: trustdollar
Yes this is enclosed on the back side. The plate and heat sink of the amplifier will generate the most heat, so no ventilation is necessary on the back side.
Answered by: MattP
Date published: 2015-09-25

I am looking for a plate amp for my M&K V-3B subwoofer. I am attracted by the 24 db slope of the SDPA 250. My M&K is 100W with a 12 inch spkr. What PE plate amps would be fit for replacing the M&K amp?

Asked by: GMT2015
We do not have a cross reference available for this type of thing. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-09-14

Best replacement subwoofer plate amplifiers for a JBL PB10?

Asked by: JerryNJ
We do not have a cross reference available for this type of thing. Please contact our tech support for more help with this question, or 800-338-0531 x1.
Answered by: MattP
Date published: 2015-08-26

The sub i have has a dual 6.5 ohm coil. So if i run it parallel it ends up at 3.5 ohms, and if i run it in series it ends at 12.5 ohms. would it be safe to run it parallel? If not would it be safe to run at 12.5 ohms? (design acoustics ps sw subwoofer)

Asked by: aron304
Wiring those coils in parallel will not harm this amplifier. A DCR of 6.5 ohms is very common for an 8 ohm coil.
Answered by: MattP
Date published: 2015-08-31

150 watts 20 hz - 200 hz are the specs for an M & K MX 125 sub that I have. Will this plate work?

Asked by: harmony08
As long as the woofer is 4 ohm or higher and you can modify the cabinet cutout if necessary, this amplifier will work fine.
Answered by: MattP
Date published: 2015-08-17

Just bought a Dayton Sub1200 could i use this amp in the sub and is it play and play?

Asked by: zeno312
Please contact our tech support for more help with this question, or 800-338-0531
Answered by: MattW
Date published: 2015-08-10
  • 2015-10-05T07:52CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_128
  • loc_en_US, sid_300-803, PRD, sort_recentQuestionsFirst
  • clientName_PartsExpressInternational


Get Deals
emailed to you every week.

Be the first to hear about new and exciting products,special pricing and incredible deals!

See This Week's "GET DEALS" Email
Get Sales Flyer
Parts Express
725 Pleasant Valley Dr.Springboro,OH 45066USA

© 1986-2015 Parts Express, All Rights Reserved

Live Chat Software