SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier

Came in very protective packaging, probably would survive an Ace Ventura delivery. Fit perfectly with wood adapter I built for my Polk PSW505 which are apparently notorious for failures. Drives subwoofer well. Way more cost effective than a replacement polk RF5050-4 plate amp. I have done minimal testing but so far seems to be performing well with no distortion at normal use levels. Will update if any problems arise.

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.

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.

Received this amp in a damaged box, the plate had a significant bend on one end. For what's obviously a fragile piece of equipment, it is the worst packaging I have ever seen, coming from a so called reputable company like Dayton. In addition to the crappy packaging, it's possible the damage came from poor and incompetent handling from Amazon. If the packaging was done on a professional level, it possibly would have survived the crappy and unprofessional handling during shipping and delivery. I returned it the same day.

The pilot light on the amp stopped working after being plugged in and running in auto mode for a few weeks. The amplifier itself is still working fine. I was able to avoid trashing a perfectly good Polk enclosure and driver by replacing the amp with this unit.

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.

Second Dayton Audio Plate amp. Works great. Pushing a Skar Audio IX-8 D4 8" 300 Watt Max Power Dual 4 Ohm Car Subwoofer in a ported box Acoustics Research Enclosure with not problem. Crossover works great as well.

I used this on my SVS PB 12 and it’s been solid sounds great

Gran potencia, calidad de audio, no se calienta. Completamente recomendable.

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

Bastante bueno, solo creo que es un poco caro.

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 👍.

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.