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.
  • 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
    (136 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 4.5515 out of 5 by 136.
Rated 5 out of 5 by from Great so farI the replaced the bad amp in my Cerwin Vega LW12 subwoofer with the SPA250. (I had to enlarge the opening to fit the new amp.) The new amp sounds great - a lot better than the original CV, I think.
Date published: 2015-01-15
Rated 4 out of 5 by from Power Plug Falls OutAmp works great, but he power plug is a joke. Doesn't fit well enough to maintain itself in the amp, easily falls out when sub thumps. Called Tech Support and was told there all that way, that's kinda knowing there's a problem and not addressing it. I was offered another cord with the same problem as a fix. There is a DIY fix, using an old very small screw driver grind the tip to a sharp needle, now with the cord unplugged, insert the sharp needle end into the female amp end contact and pry it over enough to touch the other sides contact. You'll end up with what looks the be a triangle in the plug, do this on both contacts. Now apply a 1/8" bead of silicon adhesive around the male portion on the amp plug about 1/4" up from the bottom, insert plug into amp and allow to sit in position over night. It's now good to use without falling out or loosing power contact because of the very loose fit.
Date published: 2015-01-14
Rated 4 out of 5 by from SPA250 TO REPLACE HSU SUBThe Dayton SPA250 Plate Amplifier was purchased to replace the defective HSU original VTF-2 amplifier. I had been in contact with HSU and they do not do any repairs and suggested purchasing a newer model Sub. When I inquired about another manufacturer amplifier they said the size cutout would be a problem and the cross over circuit may also be a problem depending on the amp. I should add that HSU is a very good company to work with, is a very good Sub , and their Technical Staff assistance is excellent. The Dayton amp fit perfectly and I used the original screws. I find no problem with the cross over frequency and I have switched the boost into the On position and I am using one plug. How does it sound ? probably 95 percent as good as the original at a replacement cost of 75 percent less than a new HSU Sub
Date published: 2015-01-13
Rated 5 out of 5 by from Replaced a HSU subwoofer amp!I have an older HSU VTF-2 subwoofer that had gone kaput. HSU wouldn't repair it, but they would sell me another amp (for more than I paid for my Dayton Audio amp), and the cabinet would need to be modified to accept the new one. This one from Dayton Audio fits right in, with the screw holes even matching up! The repair/replacement took less than 10 minutes, and the results....well, it sounds at least as good as when new.
Date published: 2015-01-08
Rated 5 out of 5 by from nice amp!Bought this to power a 15" Cerwin Vega 152.2 sub. (2ohm/DVC, wired as a single 4ohm speaker since this amp is advertised as stable only to 4ohm. I'm using the low-level inputs; I haven't tried the high-level inputs or outputs.)Works great. I haven't cranked it to see how loud is possible, but I had it up louder than I would normally use it, and the fins on the heat sink only got mildly lukewarm. No noticeable noise over the speaker or from the amp itself.I love the variable low-pass filter; that was one of the reasons I chose this amp. It makes it easy to blend well with the higher-frequency amps and speakers.I used a Kill-A-Watt to measure power usage (on the AC side). At idle, it was drawing 22W, 0.3A idle, so you'll want to have it power off when not in use. The peak I saw in full use was 87W, 0.87A. Even if I crank it as loud as I will ever want, I doubt it will more than double that.The auto-power switch seemed to work well to turn on. I didn't see it turn off, but I think I read it takes something like 15min of inactivity before it will shut off, and I haven't waited that long in my testing.It's true that the left/right inputs are blended into the single powered channel (the wires going to the sub). If your input is a single line-level channel (as mine is), you could just turn up the gain to get more power, but I'd recommend doing what I did: use a Y-adapter to send the same signal into both inputs. I got some solid Y-adapters (i.e., no cords) that have one female input on one side and two male outputs on the other side, and it plugs in perfectly to the two line-level inputs.
Date published: 2014-12-29
Rated 5 out of 5 by from Works greatworks exactly as expected. Arrived quickly. Great purchase
Date published: 2014-12-24

Product Q&A

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Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

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

Can this SPA 250W plate amp be wired up externally to replace the failed amp in a JBL PB-12 sub?

Asked by: Patrick P
Absolutely. You might have to extend the wires, but you can feed them through the port or drill a small hole and seal it up with silicon or caulk.
Answered by: MattP
Date published: 2015-01-23

what size fuse is reccomended

Asked by: dwjeepilot
The replacement fuse specification is listed on the back of the amplifier as a "T5AL" fuse if you are using 115V input. This means a 5-amp fuse with 250V rating, slow-blow type. For 230V input, the fuse current requirement decreases to 2.5 amps. This will allow the amplifier to draw up to 575 watts in a fault condition, though the nominal power draw is 400 watts when operating at full power. (Power draw will be much less when the amp is at idle.)
Answered by: DaytonAudio_Rory
Date published: 2015-01-23

This amp is rated at 250 watts @ 4 ohms.  Does that mean I can buy a 250 watt 4ohm speaker and not blow it

Asked by: Mannie Queen
A 250 watt woofer will be a good match for this amp, but there is no such thing as a bullet proof system. You can blow a 1,000 watt woofer with 10 watts. As long as you do not clip the amp or allow the woofer to have over excursion you shouldn't have any problems.
Answered by: MattP
Date published: 2015-01-17

My amp is 4 yrs old & connected to a "sound table," powering speakers attached to massage table. Light, infrequent usage (<100 hours, easily); original fuse blew; replacement fuses (5A 250V glass slow blow fuse) also blew. No power light. Suggestions?

Asked by: Like2hike
Usually when an amplifier blows fuses like this the amp is bad. They only have a 1 year warranty, but we would be happy to evaluate the amp and if possible, repair it at only the cost of shipping. 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: 2015-01-06

for home video use which 12 inch subwoofer will work best in a 5 cubic foot enclosure with the Dayton SPA250 plate amp?

Asked by: aJames
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: 2015-01-05


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