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
    (114 Reviews)
  • Weight13.4 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product contains 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 4.5614 out of 5 by 114.
Rated 5 out of 5 by from A lot of bang for the buck.I am using this with an old Acoustec H100 sub and the difference is incredible. A lot more power, tighter, and more accurate sound. The amp was a little large for the stock enclosure, so I built an external enclosure for the amp that is connected to the original enclosure.
Date published: 2014-07-16
Rated 5 out of 5 by from small but powerful easy to fitNice little amp comes with great sealing gaskit and hardware I used this amp to replace my blown klipsh 12 in. It pushes the12 woofer no problem kicks the 12in passive on the back to lots of adjustments to tune it to your liking in my opinion its got a great warranty and even even better support so thumb up
Date published: 2014-07-03
Rated 5 out of 5 by from Direct replacement for my Sub!After HSU told me "sorry, we can't fix your sub amp, but we'll sell you a new sub," I purchased this amp after finding out about it on a forum. It was a exact drop-in, even the old screw holes matched up, for my dead HSU VTF-2 amp. Awesome!
Date published: 2014-06-20
Rated 3 out of 5 by from First unit failed within 1 yearThe amp worked well during my first 11 months or so. Had no complaints until it failed. PE did warranty it for me. I am worried that the same thing will happen to the new unit. Unfortunately, I moved and it hasn't been used for 8 months. If it fails this time it won't be under warranty. Will try and update this as I am about to move again and will be using regularly.
Date published: 2014-06-17
Rated 5 out of 5 by from Plenty of powerThis amplifier is being used to drive 3 Aura AST-2B-4 Pro Bass Shaker Tactile Transducers, wired in series resulting in an effective 12 ohm load. At this load impedance, the amp should supply approximately 35 watts RMS maximum power to each shaker. That's way more than enough power to get my 3-seat home theatre sofa really "moving."
Date published: 2014-06-13
Rated 5 out of 5 by from Awesome for the price and excellent power!!I bought this amp for dj purposes to drive a single 15" sub and boy was I surprised! I thought for sure that the sub would bottom out due to being under powered but I was wrong. This little amp can kick out some intense power. Another thing is the fact that it isn't over or under rated. Like most amps out there today this amp has some true specs! Another good product from Dayton!!
Date published: 2014-06-10

Product Q&A

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Dayton Audio SPA250 250 Watt Subwoofer Plate Amplifier

What is the lowest impedance this was made to handle?

Asked by: SPLRaptor
This is designed for loads no lower than 4 ohms.
Answered by: MattP
Date published: 2014-07-21

I am rebuilding a Truaudio CS-10 subwoofer. The plate amp is cutting out with a burnt mark on the board.  The speaker is a 10", 8ohm and at least 150W looks to work fine. Will a  Dayton Audio SPA250 plate amp work? Btw it is a 12x12x12 ported cabinet. 

Asked by: Templear
This amplifier will work fine with a 150 watt 8 ohm load.
Answered by: MattP
Date published: 2014-07-17


Asked by: MCCLAIN659
Unfortunately the low pass filter cannot be bypassed but the bass boost can be disabled with the switch on the amplifier.
Answered by: MattP
Date published: 2014-07-10

Would the Dayton SPA250 be the correct replacement for my Cerwin Vega 12s? It's the powered subwoofer that came with the CVHD 5.1 and CVHD 2.1.   If not which one would it be?  Thank You for your time on this matter.

Asked by: TJ1SM
This amplifier will work well as a replacement for that amplifier, however there is no guarantee it will fit without cabinet modifications.
Answered by: MattP
Date published: 2014-06-30

I have a kenwood 200 watt (1000watt peak) capacity suubwoofer drive, Can I use this amps to make a subwwofer?

Asked by: Binoy
As long as the woofer is 4 ohm this amplifier will work very well with it.
Answered by: MattP
Date published: 2014-06-27

I would like to use this amp to replace a non-working amp on my JBL PSW-D115 and connect it to an Onkyo P-304 pre-amp direct RCA line output. Is there any down side in not using LFE output?

Asked by: Gause
There is no down side with no dedicated LFE input. Simply plug the subwoofer into one of the two RCA line inputs and turn the crossover knob all the way up.
Answered by: MattP
Date published: 2014-06-26


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