I've been meaning to post this for awhile now, and finally got around to it.

So, I built three of these thingies a few months ago. A bandmate and I were having lunch, and talking about various pieces of gear. He asked me if 8'd ever heard of the "Sound Enhancer," a passive device used to do the following:

1) Take the back pressure wave from an open backed guitar amp speaker, and send it forward, resulting in
2) increased volume with the amp running at lower gain levels
3) increased bass frequency response, giving you a warmer stage tone, and
4) tilting the amp up toward your ears so you can hear better what you're playing.

Here's a vid from 2012 Summer NAMM of the inventor and his device:

https://www.youtube.com/watch?v=WLcZN4Sa-bA

I researched it, including the patent, and decided I could build one myself. I ended up building 3 of them.

The first, smaller one (pic 1) was based on an attempt at scaling a picture of a Sound Enhancer Mini from the TDPRI website. I slapped it together out of 1/4" plywood.

The second (center of pic 2) was an upscaled version, based on a discussion with the inventor on TDPRI, where he revealed the height, width, and depth dimensions. It's the one with the amp sitting on it.

The third (left side of pic 2) was my attempt at building the actual patent schematic.

Soundwise, they all have measurable (as in 10 dB) increases in volume versus just the amp itself, for the same gain setting. The center one had the best overall tone, with increasing warmth, and the bass frequencies seemed to be in phase with the speaker. The smaller one works OK with a smaller amp, like my Fender Champ 600, which definitely needs help with bass response from the 8" speaker. The patent schematic clone had the largest overall volume increase (it has a slightly larger interior volume than the middle one) but had a discernable warble or filter of the bass frequencies: loud, but unbalanced.

This was a fun afternoon project. Each one took about two hours to cut out and build. They are glued and screwed together, and are actually fairly lightweight.

Unfortunately, I forgot to record video / audio of my buddy playing through them. I can get drawings and dimensions for you if you PM me.

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Oh ,okay Ron I see what your talking about now that I went to the link again. I was thinking "just a stand to angel&raise your amp ,but this one in the pic has ""port holes". I've never tried anything like that in order to get more sound or a different tone. Like I was saying When playing gigs we have all our amps run threw a board and personal monitors ,but I would like to hear how much of a effect these have on a amp ,but be more to carry to a gig is the only downside if you already have plenty of gear to load ,unload ,set up & break down to load everything back up ....lol So we try minimizing if you know what I mean ,but if your not carrying too much equipment already ,,,"may be worth the added load"? I get what your saying Tho and would like to see a video w maybe using a small amp.
Here ya go:

https://youtu.be/WLcZN4Sa-bA

And yeah, if you have lots of gear, thi coulbe just one more thing to carry. Harold Smith has been working on a lightweight foldable model to combat that problem...

This is a good idea. The materials used and the dimensions can play a big part on the tone and volume. It's like a big acoustic box for the amp.

Some people like a closed back amp over a open backed amp. I have 2 small closed back practice amps that have a great tone to them.

One thing that you could do with a closed back amp is to make a port that can be opened/closed, either on the back to use this device or in the front (behind the grill cloth if you have one) like the 3-way stereo speakers have.

Materials used can definitely make a difference in tone.

Example: I have a 1965 Silvertone Tube Amp that I found on the side of the road. It worked once I put a cord on it, but the original cabinet wasn't in good shape. It had a cabinet made of what seemed to be pressed fiberboard.

I was going to make a nice wood cab for it, but ran low on funds. I had a couple of 3-way stereo speaker cabs made of pressed sawdust. The speakers were no good, but the cab was big enough for the 12" guitar speaker and amp so I transplanted the guts over to the speaker cab.

I'm so glad I did that. The tone from the original amp cab was kind of thin and too high. Now the amp has more lows and mids and sounds great. Doesn't look great and it's heavy, but that doesn't matter compared to sound. Had to use the back of the cab for the front of this amp, so the back has some open spots.

So materials and dimensions can make a difference in the resulting tone and volume.

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