It looks like you're new here. If you want to get involved, click one of these buttons!
Subscribe to our Patreon, and get image uploads with no ads on the site!
Base theme by DesignModo & ported to Powered by Vanilla by Chris Ireland, modified by the "theFB" team.
Comments
the principle is used in car audio so I tried it and liked the results. By slowing the reflections down you can give the impression of a bigger cab. It's night and day on my little tubemeister combo, really noticeable.
Would you foam out the whole thing, or just parts?
Think i'll give the donut idea a try, though
I haven't tried it myself, but I understand the physics behind it and I have no doubt that it works.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
You'll also need some spray contact adhesive. Be careful using it, let it dry thoroughly before sticking the foam to the grille cloth otherwise the glue will mark the cloth.
https://www.efoam.co.uk/quote-foam-cut-to-size.php?FoamCutToShape=ACrectangle&shape=SACrectangle&size=48&len=13&thickness=1.57&width=13&specialf=11&inito=11c1c0&meas=in
using the acoustic foam, 1" thick and 13" x 13". Can't say I noticed a huge difference
I may still have a tile spare. Pm me your details and I'll send you one to have a play with.
Actually it should make the mic position less critical, I think.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Used the foam from efoam iirc I went toward the thicker end of what's recommended in the original instructions
And yes it makes mic positioning simpler - there just seemed to be no issues with frequencies that couldn't be dialled out or in - just get it up there capturing enough level and off you go.
we all know that sound guys can mistakenly eq the mic'd sound influenced by what they are hearing direct, so if anything removing those piercing/beaming frequencies just makes the whole thing seem simpler.
I'd do it to any amp/cab I was going to gig
https://www.efoam.co.uk/index2.php?shape=ACrectangle
Way back in 2009, so I must have been one of the first in the UK!
And yes it does work. I was shocked when in a band setup I took a very long lead out front to hear the band play so we could set levels, and my amp sounded awful, so harsh and brittle but on stage it was great. Ended up having it facing the back of the stage a,d then didn't use that amp again (Ceriatone DZ-30, quite a bright amp anyway)
In order to cut the outer diameter, slip an oversize piece of foam between the baffle and the grille cloth. Make sure its not under tension then mark it with a felt pen. Scissors will then cut it accurately enough. It needs to be a snug fit.
IIRC I used 12mm foam on nearly all my cabs with a hole size from bean tin up to golden syrup Yes you need someting very robust to cut the round hole. You'll need a very sharp stanley knife blade or better still a modelling knife. Press very hard with the tin on a cutting board (not the kitchen worktop!) so that the foam is completely compressed, then cut. This will render a very neat hole. IT works as well if you need to enlarge it slightly using a bigger tin but you need to press even harder to stop the foam slipping out from under.
You will re-EQ your amp slightly afterwards as you will lose a little high end, but you will also sound the same from wherever you listen.
I cannot believe how long it's taken me to get to grips with the on-axis ice-pick tone of a guitar amp & to stumble on the Mitchell donut as an effective solution. The Michell donut is just amazing!
My foam arrived today & I've applied the donuts to five speaker apertures (Three 1x12" & one 2x12"). The difference is really significant. The tone on and off axis is now much more consistent.
A real bonus was discovering that efoam will supply the foam already cut to a circle - just specify the diameter you want. All I had to do was cut out the middle 75mm hole using a baked bean tin as a template (following Hywelg's advice above).
Such a good result...!
Probably a good idea to clean the baked beans out first, though.
Years of chopper building including their seats has taught me the best tool for cutting foam that you're likely to find around the house is an electric carving knife.
If so those are truly great speakers, if a little heavy!
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
No, it's the Celestion A-type I pulled out of my HRD - it works well as an extension cab for my Jet City.
Good spot on the Stage cabinet thought!