Dayton Audio SPA500 500W Subwoofer Plate Amplifier

Brand:|Model: SPA500
The Dayton Audio SPA500 Subwoofer Amplifier delivers the efficiency of a Class-D design, without compromising audio quality and reliability.
A restocked/refurbished, or Open Box unit of this product is available -- see it now
In Stock
List Price$399.99
Regular Price$285.50
You Save10%
Sale Price
Part # 300-807
  • 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

Product Details

Dayton Audio SPA500 500W Subwoofer Plate Amplifier

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
    (39 Reviews)
  • Weight20 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 SPA500 500W Subwoofer Plate Amplifier
in the Subwoofer Plate Amplifiers product category.


Dayton Audio SPA500 500W Subwoofer Plate Amplifier
Dayton Audio SPA500 500W Subwoofer Plate Amplifier is rated 4.2051 out of 5 by 39.
Rated 5 out of 5 by from Produces an exceptional bass soundThe sound this Amp produces with the speaker it drives and box it's installed is of the highest quality. A truly "SWEET" ultra-tight undistorted bass, which even with over 3/4s gain does NOT make the windows or any other object vibrate in the room. Yet it is producing massive amounts of 30-minus Hertz signal, which if played through most other types of Subwoofer drivers would shake the foundations of the room.This amp coupled with the 13inch Scan-speak Revelator produces real TEXT BOOK quality clear TIGHT bass. I have never heard anything like it before.Amazing stuff.
Date published: 2015-06-29
Rated 5 out of 5 by from Amp mated to an Ultimax 10" in a ported boxI needed to add mechanical resistance with too much poly fill because it was clipping during a test fit. Now it provides enough power to extend down to 20Hz. The software heard it to 17Hz, after calibration. I have not used the EQ on the amp because I do it at the preamp. If I did not know how to wrangle it's power it would seem like a bad amp, it is just wild and needs control
Date published: 2015-05-15
Rated 1 out of 5 by from Exaggerated SpecsThis amplifier isn't what it seems. At first glance, the power to price ratio seems reasonable until you read the fine print about the amplifier producing its rated output at 1/3 duty cycle. At four ohms, this amplifier produces nearly half of its rated output at acceptable distortion levels, continuously. In addition, the auto on circuit is poorly designed as it requires around .5 volts of input signal to activate. This amplifier also produces excessive turn on thump when the auto on threshold is reached. The manufacturer could have added a second relay that decouples the output stage, but they didn't spend the extra time or money in the design process.
Date published: 2015-04-08
Rated 3 out of 5 by from Bogus Companybought sp 500 and cant get it fixed. company said its cost prohibited. and they wont send schematic even if I pay.
Date published: 2014-12-12
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
  • 2015-08-04T09:23CST
  • bvseo_cps, prod_bvrr, vn_cps_3.1.5
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_39
  • loc_en_US, sid_300-807, 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 SPA500 500W Subwoofer Plate Amplifier

I have two 18" Dayton HO subs in 4cu/ft enclosures in a 1,800 sq/foot room with an open stairway. If I am using Dayton 500 watt plate amps on each, am I under powering them? Do I need the 1000 watt amps on each?

Asked by: Dan_K
We recommend as much headroom as possible when dealing with subs, but as long as you are not clipping the amplifiers there is no need to upgrade the power.
Answered by: MattP
Date published: 2015-05-28

I currently have 4 aura bass shakers  powered from a Dayton 250 watt plate amp. I would like to increase the number of shakers to 8.  Is there any reason that I could not power them all from one 500 watt Dayton so I don't have to split my LFE signal?

Asked by: cbarton
Eight shakers will have to be wired to 8 ohms, so you will only get ~250 watts from this amplifier but it is certainly possible. Getting a second SPA250 will save money and double power if you wire 4 shakers to each, so this might be your best bet. Splitting the LFE output will not negatively affect anything.
Answered by: MattP
Date published: 2015-05-12

RMS watts is listed, or is this peak?

Asked by: Michiganengineer
The power listed is RMS.
Answered by: MattP
Date published: 2015-04-27

Hello, Is Z-Min 4 ohm or will this unit drive a 2 ohm load .....

Asked by: Spkprobe
This amplifier is not stable at 2 ohms. it is limited to 4 ohms or higher.
Answered by: Chrisf
Date published: 2015-04-02

I see one answer that the sub-1500 would need modifications to the cabinet to fit. Any idea on ohms for the sub-1500 Is it two or 4 or 8 ohms. Thanks

Asked by: Edzzed
The woofer in the Dayton SUB series subwoofers are 4 ohms.
Answered by: MattP
Date published: 2015-03-24

Would this amp run 2 10” 4Ω Subwoofers with the Power Handling: 250W – 750W each? If so should I run them parallel or in series?

Asked by: JohnNorman
Yes it would but you would have to run them in series effectively halving the output from the amplifier (~250 watts total, 125 to each woofer). You might want to use the 1000 watt model which will provide about 250 watts RMS into each woofer wired to 8 ohms.
Answered by: MattP
Date published: 2015-02-13
  • 2015-08-04T08:56CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.5
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_48
  • loc_en_US, sid_300-807, 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
Parts Express
725 Pleasant Valley Dr.Springboro,OH 45066USA

© 1986-2015 Parts Express, All Rights Reserved

Live Chat Software