Dayton Audio SPA500 500W Subwoofer Plate Amplifier

Brand:| Model: SPA500
NEW updated design! The Dayton Audio SPA500 Subwoofer Amplifier delivers the efficiency of a Class-D design, without compromising audio quality and reliability.
  • High power Class-AB output stage for clean, controlled output
  • Patented tracking downconverter power supply for high efficiency
  • Toroidal power supply transformer
  • Low frequency parametric EQ allows you to boost or cut to custom-tailor sound
  • Advanced soft clip circuitry improves headroom and protects woofers
  • OTC™ (Optimized Thermal Circuit) protects amplifier from potential heat damage
  • Hercules heat sinks dissipate and control heat for extreme reliability
Part # 
Weight: 20 lbs.  
List Price$399.99
You Save33%
Your Price
Part # 300-807
Qty:  EA
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Product Details

Dayton Audio SPA500 500W Subwoofer Plate Amplifier

NEW updated design! One of the most technologically advanced subwoofer amplifiers on the market today! The Dayton Audio SPA500 subwoofer amplifier is based on a state-of-the-art Class-G circuit topology that combines the proven high power, high fidelity characteristics of a Class-AB amplifier with a patented tracking down converter power supply to achieve an operating efficiency up to 86%. You get the efficiency of a Class-D amplifier without compromising audio quality and reliability. The Class-AB output stage provides the clean and low-distortion sound that audiophiles demand, without any of the instability problems that plague other high-efficiency amplifier designs.

This American-designed and engineered amplifier uses patented circuitry that continuously tracks the input signal to modulate or control the voltage available to the output stage. This "tracking" capability delivers the exact amount of power based on demand instead of constantly keeping it in reserve, so the output stage only draws the amount of power that is required at any given time. Less energy is wasted as heat, and more power is available for the subwoofer driver. With its enhanced thermal management, the SPA500 is an upgrade over previous models—making it a nearly bulletproof amplifier choice for today's demanding HT audio and music playback applications.

Specifications: • Rated power output: 273 watts into 8 ohms, 540 watts into 4 ohms with 0.92% THD (based on one-third power duty cycle) • S/N ratio: 98 dB (A-weighted) • Low-pass crossover: 30 - 200 Hz, 24 dB/octave • Input voltage: User switchable 115/230V (Euro cord available) • Dimensions: 11-15/16" W x 11-15/16" H x 5-1/4" D; Cutout dimensions: 10" W x 10" H.

Dayton Audio SPA500 500W Subwoofer Plate Amplifier
  • BrandDayton Audio
  • ModelSPA500
  • Part Number300-807
  • UPC844632015922
  • Product CategorySubwoofer Plate Amplifiers
  • Unit of MeasureEA
  • Product Rating
    (35 Reviews)
  • Weight20 lbs.
  • Case Qty2
  • 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.

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Dayton Audio SPA500 500W Subwoofer Plate Amplifier
Dayton Audio SPA500 500W Subwoofer Plate Amplifier is rated 4.2857 out of 5 by 35.
Rated 3 out of 5 by from 8 months of great bassAs the title states, bought this amp to replace the trouble plagued plate amp in the MFW-15. I was very happy with the upgrade I made with 500 watts from 300. Sadly, she popped at a moderate volume level while watching The Legos Movie.
Date published: 2014-08-03
Rated 5 out of 5 by from Loaded and well built!Great bass amp. crystal clear bass response. Very well built.
Date published: 2014-06-30
Rated 5 out of 5 by from HUM fix, expensive or notI've had the hum problem on every Dayton amp I've owned, but understanding what causes it makes the fix easy or expensive. Some use the ground loop gizmo to kill the hum or I use a simple (say cheap) method. Go to your hardware store and buy a three into two line plug convertor ($2-3) and it's gone forever. For those who are lost, you have a plug at the end of your ac cord to plate amp that is a three three pieces of meta with the round piece a ground. The convertor essentially takes the ground out of the hook up. If you are really cheap, take the pliers and break the ground off (has the same affect) . Please don't reply with a thousand reasons why you shouldn't do this, most of my recent purchases of electronic equipment don't use the ground now.
Date published: 2014-05-31
Rated 5 out of 5 by from Great performance, excellent price.I am running this in a custom enclosure with a 500W DVC subwoofer, and it more than handles the sound to fill my entertainment room. Well worth the price.
Date published: 2014-04-07
Rated 5 out of 5 by from So far so good!So far this product is what I expected. Has a lot of features and has performed solidly so far with the PE Reference 10" in the new PE 1.0 ft^3 enclosure. Just enough power for that application. Had to do a lot of alterations to the sub box to get it to fit but my woodworking skills are up to that challenge. Have another smaller PE amp that developed problems after a couple years but unfortuneatley I think this is the case with most these Chinese sourced amps for bargain prices. Just hope this one lives a little longer. :)
Date published: 2013-11-05
Rated 4 out of 5 by from Solid Amp for the PriceI used this amp to power a Dayton Audio Ultimax 10in in a ~1 ft^3 sealed enclosure.My primary motivation in selecting this amp over the BASH 500W was the parametric EQ. Based on my simulations, without any equalization, this system would have an F3 of ~44Hz. Use of the parametric EQ does make a notable improvement to the system's bass extension. I have not taken measurements but my ear estimates the new F3 is in the mid to low thirties.Another reason I picked this amp over the BASH was that it looked like it would make a tighter seal. The BASH looks like a big PCB screwed into a plate; the components of this amp are fully encapsulated. In reality, it may ultimately be just cosmetics but having the components enclosed seemed more robust to me. I found that this amp does make a solid seal.A complaint I have is that this amp is extremely sensitive to AC electrical noise. When I put it on a power conditioner, the noise did drop out completely. But, if you want to plug this amp directly into the wall and your AC power is not clean, you might hear it.Another complaint I have is that the low pass filter slope is steeper than I would prefer. I own a different sub that with a 6dB/octave slope and it is much easier to blend. With a slope of 24dB/octave, if the low pass filter frequency is not set just right, it becomes very apparent that a subwoofer is in play. I probably would have gone with 12dB/octave.
Date published: 2013-10-21

Product Q&A

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Dayton Audio SPA500 500W Subwoofer Plate Amplifier

What kind of warranty does this amp come with if any?

Asked by: t0mmyr
This amplifier will have a 1 year warranty when purchased brand new (not refurbished).
Answered by: MattP
Date published: 2014-07-28

Hi! How do you change it to 220 volt from 110volt?

Asked by: Alexander1234
This is 110 volt out of the box. No modification is necessary for 110 volt operation.
Answered by: Chrisf
Date published: 2014-04-14

How does the auto on/off work.

Asked by: Jerry09
When the receiver sends a low voltage signal through the subwoofer output, it acts like a trigger to bring the amplifier out of standby mode. Once this low voltage source (receiver) has been turned off, the amplifier will go back to standby after 10 or 15 minutes.
Answered by: MattP
Date published: 2014-02-20

Are the power ratings (273 watts into 8 ohms / 540 watts into 4 ohms) peak ratings or RMS? If peak, what are the RMS ratings into 8/4 ohms? Thanks

Asked by: mlundy57
These are both RMS ratings.
Answered by: MattP
Date published: 2014-02-06

Should i switch a jumper or something for 230v opeartion?

Asked by: Mike007
In order to be used with 230v power, you will have to pull the fuse holder out and rotate it 180 degrees. You can see page 3 section 3 of the manual for these instructions.
Answered by: MattP
Date published: 2014-01-06

The overall depth of the product is 5 1/4". I am assuming this includes the height of the heatsink? How much clearance is required behind the plate? (ie not including the height of the heatsink)

Asked by: grtx
The depth of 5-1/4" is actually the mounting dept, allowing for about 1/4" of clearance for the wire leads out the back of the case.
Answered by: MattP
Date published: 2014-01-02

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