Dayton Audio DAEX32EP-4 Thruster 32mm Sound Exciter - 40 Watts RMS 4 Ohm Imepedance - Audio Transducer - Turn Any Surface into a Speaker System - for Large and Rigid Surfaces

I bought 7 of these for a complete surround sound system. Yes, i got the idea from Tech Ingredients on YouTube! I was initially not even remotely happy with them. I tried using them with the 24" x 24" foam panels you can get from the big box stores. The sound was really hollow. Even paired with a good quality subwoofer, there were a lot of frequencies missing.However, i realized two things - first, it was partly my fault for how i was mounting them. And second, they work way better with the acoustic ceiling tiles.In the picture, you can see the front five speakers - mains, center channel, and the "height" speakers for atmos. I also have another pair of them for the rear surround, mounted on the ceiling above the couch that viewers will be using. Everything sounds amazing, given the price. I love the way they look, and although the sound is not quite perfect, it's plenty good for my setup as a second media room.I bought these things on sale, paying $20 something for each. The ceiling tiles are $20 for a set of three. I made some mounts out of plywood with a little accent strip of scrap purpleheart. The tiles are hanging on some cheap black monofilament. So the entire 7 speaker setup was only about $200 dollars. Maybe $250 if you include the speaker wire and the paint i used.This was a very satisfying project, and was absurdly easy. The speakers sound good, and really fill the room with nondirectional sound. The frequency response is not perfect, but there are lots of things you can do to improve that - specifically by adding additional panels of different sizes and shapes down the road.If you want a weekend project to make some great conversation starting speakers that sound pretty great, buy these right away. I don't think you will regret it.

I will just say that I have owned many speakers over the years. Ranging from JBL Studio Drivers to Bose 901's....to Cerwin Vegas...to Klipsch, Polk....etc, etc. (For anybody wondering....yes, I am that old)When I saw the Youtube videos online, I had to try it. I had to see it work at all.Maybe I had been conditioned by my many years of speakers.....but to get any sound at all sounded a little far-fetched. I wondered if building speakers with these was akin to building that radio using one of these kits that kids can do. OK, you got some radio. Not ready to replace my home system with it though.And to get good sound? Voodoo.....Sorcery...I am here to tell you....it works. I used two of these with 1" thick foam board 2frx2ft.And the quality of the sound? OMG!!!!! This has left me re-thinking everything that I thought I knew in over 40 years of playing with speakers. Now to be fair, you can expect a pretty steep drop-off at approx the 200Hz range. There is no base...at all. But after building these speakers..(And a child can do it, in fact, I had my 10y/o child help me as a project), I paired them with a cheap little amp that had Bluetooth and a sub out with power....... along with an old car sub that I had laying around.The sound is fantastic.It is a very natural sound...a little bright, but not overly emphasized at any level. The stage is fantastic. The separation is equally so. I prefer a little warmer but it was easy to adjust that.I am not prepared to say that these are the best speakers that I have ever heard. BUT HOLY CRAP!!!!To get better...you are going to have to really step up your game and be prepared to easily spend north of a $1,000.I wondered if it would be a good sound like a little Bluetooth speaker is a great sound. Tiny, not much to it. OH NO....this is room-filling sound. This has volume. These are VERY efficient.While you can tell a difference if you standing in front of them, vs off to the side, they are far better than many speakers and much less noticeable.I will caution you....if you make these and hang them, do not use metal on metal contacts anywhere in the mounting. I had metal hooks connected to metal cotter pins and I had terrible noise, to the point that I wondered if I blew something. As soon as tied fishing line to the cotter pins and removed the hooks, the noise totally went away.

Positive red terminal not marked. You have to turn it over and the bottom of the terminal is red.

Good quality

When mounted to an object, a metal plate, or even pressed into a surface while audio is playing back, it is interesting to turn almost anything into a speaker!

Yes, it works and your sound is mid-range to high.

I bought these to 'build' a pair of DMLoudspeakers. More than impressed.I will be buying more in the near future to build an line-array system for my workshop.

I saw that video "Best Speakers in the World" and others. I had to try them once I saw the price. They're surprisingly nice. Keep in mind the 2/5 and 3/5 rule.A little difficult to set up with speaker cable, mine kept coming apart without soldering, so maybe use a Female Spade Wire Connector. Insulated or whatever, it makes it a lot easier but costs a little more and you have to crimp the ends.My biggest complaint was that the sticky part on the back was really only good for one use from my experience. Can't get it back on the original source without using some tape.Using the boards recommended from the videos, these are conversation starters and just fun to show off.