Installed Mitchell Doughnuts in my cab

[cardinal]

In my Marshall 1965B, installed some "Mitchell Doughnuts" (3/4" foam disks in front of each speaker). I varied slightly from the directions (https://www.thegearpage.net/board/showth ... p?t=470956) by making the center hole ~2" rather than 3". I figure I can widen the hole if I want.

Noticed two things:
1) The cab is MUCH less directional now. Obviously walking around the room, you'll notice differences in tone still, but it's significantly less drastic. Sounds kinda like you're off-axis all the time.

2) It cut some high end. If I opened the center hole, I suspect I'd get at least some of it back. I'll leave it as-is for now since the SLO's never hurting for lack of high end. I just turned up the dials and it sounds pretty darn awesome, but now from wherever I'm standing. Before the doughnuts, there was a bit of a treble-death-beam directly in front of the cab.

 

[Shark Diver]

Always wanted to try those.

 

[Mudder]

Sounds similar to Weber beam blockers.

 

[squank]

Sounds similar to Weber beam blockers.

Though the concept might appear to be similar, there are some important differences. The Webers are plastic, and actually reflect sound back at the cone (causing unwanted effects). The foam donuts simply absorb some of the high frequencies that are so prevalent directly in front. It makes the cab sound much more even from a wide angle in front.

I've been using these for about 5 years. They are great.

 

[mikey]

I did this to one of the two Marshall 1960ax cabs I have and it does lessen the beaming somewhat. I thought it might have rolled off more top end but it works pretty well, cheap mod as well.

 

[mentoneman]

glancing over the title of this thread it looked like you installed michael douglas in your cab
sounds like a cool thing to try

 

[thegame]

Yngwie should be interested.

 

[tripstan]

I'll have to try this. We use the same foam at my business, but I never thought of using it like that.

 

[Aristocat]

Yngwie should be interested.

Hahahaha.

Not great to burst out laughing during finals week in the library.

 

[BC Audio]

Let me be the first to say, "Mmm...!"

 

[stephen sawall]

I am one of the first people to try it ... Highly recommend this method over any other I have tried.
When I first tried it I did half a Marshall stereo 4x12 so it was very easy to compare the differences. It works exactly as stated. Any change in tone can be fixed by adjusting the tone controls on the amp - minor adjustment's or none needed.