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Dayton Audio SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier
The Dayton Audio SPA300-D high-efficiency subwoofer plate amp packs big-amp features into a compact chassis that is ideal for installation into cabinets that can't accommodate bulky old-style amps.
Key Features
- 300W RMS Output @ 4 ohms
- Switchable 6 dB @ 30 Hz bass boost
- Class-D output stage for highly efficient, well defined output
- Manual and Auto 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
Additional Info
USB Power Out
Attach a Dayton Audio WLS System to the USB output and enjoy a wireless connection from your stereo system
Variable Crossover
Maintain a smooth transition from your full-range speakers with a variable low-pass filter.
Bass Boost
Get maximum performance from smaller drivers and enclosures with a switchable 6dB boost at 30Hz.
Auto-On
When no signal is present, the SPA300-D will shut itself off until you need it most!
Class-D Excellence
The efficient class-D design keeps size and weight to a minimum while providing maximum power to your driver. SPA-D Amplifiers are perfect for subwoofer duty due to their high efficiency and low noise volume at lower frequencies making amplification selection easier than ever.
steve worful
Reviewed in the United States on May 6, 2025
Plenty of power when your subs need to dig deep. Adjustable settings on sub levels. Don't get hot and auto turn on.
Customer
Reviewed in Canada on January 19, 2025
I have used this for 2 years now...I bought a 2nd one because it was on sale..I'm using a 12 inch sub...it really pounds good..can turn it down to 60 or 70 hz...makes some really deep bass...I built my own box with a compartment for the amp ...I installed a cooling fan in that compartment...the amp could use bigger cooling fins..in my opinion
Chris W.
Reviewed in the United States on January 11, 2025
Have a Polk Audio PSW505 who's amp let out the blue smoke. A powerful sub that i didn't want to kick to the curb just yet. Bought this amp and made an ABS adapter plate and installed on my 505. The stats on this are less than the factory amp but swear it has more, cleaner power than OE. Sounds great and even rattles the glasses in the wet bar nearby during powerful movie scenes.
James
Reviewed in the United States on April 8, 2025
Works very well.
Customer
Reviewed in Mexico on September 3, 2024
Gran potencia, calidad de audio, no se calienta. Completamente recomendable.
John W
Reviewed in the United States on May 13, 2024
I have it running two old 150w rms 10" Pioneer Premier DVC subs that are wired at 2 ohm each, in series for 4 ohm total. This amp is pretty much an perfect fit for them, power wise. It hits hard and clear! I mounted the amp to a generic aluminum "electronics project box" and have the USB powering a small fan to keep the box from getting hot.Before getting this, I was thinking about getting 2 upgraded power supplies for the two smaller amps I had, one for each sub, to get their RMS up to the spec of the subs. This amp was cheaper than the 2 power supplies. So now I can repurpose or maybe sell those amps.I do wish there was a way to make the USB turn off when in Auto/standby or off. The only way is to unplug or flip the main switch off. If the main power switch is on, it doesn't matter which mode the secondary power switch is on, off, auto, or on, the USB would always be on. It's not a huge deal for me, because I normally leave it unplugged anyway. But I do see that as a disadvantage in other situations.
Dieter
Reviewed in the United States on March 1, 2024
I had an old expensive subwoofer in my system. When it broke I was debating sending it for repair, which seems to be ridiculous expensive. A newer model would be even more expensive. Since the problem was with the electronic I also did not want to waste the chassis and the speaker itself.So I stumbled over this subwoofer plate amplifier. Since this one is only a fraction of the cost as any other options I had, I gave it a try. By simply removing the old amplifier and mounting the new one ( needs a small frame I built ) it worked like a charm. Even with the 300W rating it creates a lot of clear sounding bass. This is a perfect replacement when you are on a low budget.It has all the knobs you need to tune and integrate it into your audio system. Requires a bit calibration to seamlessly work in your audio setup.It runs also from 120-240 Volts in case you live in Europe. I'm a happy customer now, every penny well spent.
Matthew Kent
Reviewed in the United States on December 13, 2024
So i have tested this amp and it seems to work just fine pushing two 10" subs for an enclosed shop.Bought this and some Boss speakers to build a custom cabinet with my dad as we did when I was a kid
BRAD
Reviewed in Canada on November 18, 2024
It works for what it is,definitely not 300 watts as advertised, probably like 50 to 100 watts at best. Do not buy, and I can't return it, it's not 300 watts as claimed, junk.
I. Haynes
Reviewed in the United States on October 26, 2024
This product worked great until it didn’t. It lasted 2 months then died. I’m beyond frustrated as this had great reviews. But when i get the amp it worked great until today and it died. I haven’t been pushing it too hard or anything. But yet today it dies. Of course on the day it is the last day to return. I’ve always heard Dayton was a good brand but today the capacitor shorted and zapped the hell out of me while trying to figure out why it wouldn’t turn on even though it ran for that last couple weeks. Today it wouldn’t turn on at all. Then when looking at it. It zapped me like crazy. Don’t buy this amp unless you can afford constant replacement. This amp is trash. I’ve only had two months of use at less than half power. Don’t buy unless you have time to swap many times. I’ll update the review after the company fixes the issue. If they don’t this review will stay as this product currently in my opinion is trash.
John Roberts
Reviewed in the United States on October 22, 2024
Got this today, as a replacement for a blown amp on a 17 year old REL T2. Had a lot of time waiting, so I already had a 1" thick back fitted to the cabinet.. Installed amp, and spent a bit of time getting it set up with KEF LSX powered speakers. Did not need the +6 boost at 30hz. Used the KEF app to adjust the x-over points and any trim. WAY more bass than the REL "200 watt" amp. High pass at 70hz; low pass at 65. +1 on bass boost (+2-10 just not needed). That was it, so far. Sounded good! Plug & play, basically.Now, complaints...I ordered this 9 days ago. I am not complaining about not getting 1 day shipping, or 2 day shipping. And I understand that things can go awry. But all last week, Amazon was still advertising "2 day shipping" on this unit. I theoretically could have re-ordered it on Wednesday, received it Friday, and just sent back this unit when it came in (the following Monday). It appears they were promising to new customers while reneging on deals with existing customers. 2 chats yielded promises to "expedite" the order, but that didn't happen. I hope nothing goes wrong with this amp, because I don't want to go into Amazon shipping hell again.Update after a couple of days…on some modern pop, too much bass at +1. Rock, blues, most jazz great. Reggae 👍. Organ music is big, and low volume anything is good. I can adjust on the fly for pieces with too much bass, so thumbs up on the amp.Update 2 weeks later...still too much bass, so -2 on the volume, high pass still at 70hz, but low pass at 60hz. Sounds very good!One last comment, one month in…the Auto On/Off is slow to come on if the music is quiet-ish or lacking much bass. I now leave it On all the time; instructions say that’s costing me 8.5 watts. This seems like something that should be properly engineered out by now.
Denis Vandale
Reviewed in Canada on October 15, 2024
Connecting sub 1 out from Marantz SR7015 - no output to 15SSW-4HE verified working SUB, when using R rca input, connecting to L input does produce output. Setting the auto on/off switch to off (that's auto on I presume), amp never turn, setting to on means amp is always on. Fixed everything, cold solder joint on R rca connection, re soldered all ok, switch is 3 position, center is auto on. Not clear in instructio manual. Works well, sounds 👍.
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