Who has used a PMR?

Dear Elizabeth, I am unfamiliar with JDwfmr and the KBW Ultra. What are these devices and how are they better? Thanks

Rnwong...Liz is pulling your leg...and mocking all who use the PMR or for that matter, any acoustical resonance device.

The only thing you need to know about the PMR is that its simulates the very real positive effects that tuned resonances can have on an acoustical space. Take for example the world famous Vienna Musikverein where you will notice,upon close inspection,large hollow brass figures all along the walls.

Hmmmm..makes one wonder why its considered one of the most perfect acoustical spaces in the world!

I have made a D.I.Y version that I use in my 2 channel system. I use a 8 1/2, and and a 10 inch round Aluminum lamp shade. Thus the name was born " Sound Shade". I do have them modded with solid brass cap on a solid copper fitting in the center hole where the light bulb would be.

The D.I.Y Sound shades work just the way Rnwong described. My knock-off D.I.Y version both open's up the sound field and focus the music. The sweet spot is much larger and detailed. There is just way more music coming at you.

If removed you will want to put them right back in. The difference is that noticeable. I have pictures of them if you click on my system.

Without the copper fitting and the Brass cap on the end they do not sound nearly as good. There's a tweak or two you can do to make them work even better. If mine work this good, I know the original must work just as good if not better.

Jejaudio, interesting and innovative! Thanks for the input.