Cabinet isolation boxes?

[jspeed]

Here ya go

http://ascase.com/ascase-isocab.aspx

If the interior was filled with rockwool covered with burlap it would sound better and be more quiet too.
Foam is not the best way to go, rockwool is the material that is used in most real studios around the world.

Good luck!

[Nightbat]

Newc, you ever though a about a remote controlled movable mic stand so you can change positions in the cab without needing to open up the box and go deaf?
(I know I am contemplating some kind of Lego technic ghetto stand when/if I ever push this project through )

[Nightbat]

If the interior was filled with rockwool covered with burlap it would sound better and be more quiet too.
Foam is not the best way to go, rockwool is the material that is used in most real studios around the world.

Good luck!

This may help choosing

http://www.bobgolds.com/AbsorptionCoefficients.htm

[Newc]

Newc, you ever though a about a remote controlled movable mic stand so you can change positions in the cab without needing to open up the box and go deaf?
(I know I am contemplating some kind of Lego technic ghetto stand when/if I ever push this project through )

Believe it or don't.......yeah, I had a wild idea some years ago for a frame that would allow a mic to move around in front of an amp/cab until you found the sweetest spot. I based it on a computerized measuring machine we have at work that moves on the X, Y, and Z planes. I figure I can hook an Xbox controller to it to run it


Cables and pulleys and Erector Set motors.

I also thought about piezo transducers mounted to a cabinet.

[Newc]

Here ya go

http://ascase.com/ascase-isocab.aspx

If the interior was filled with rockwool covered with burlap it would sound better and be more quiet too.
Foam is not the best way to go, rockwool is the material that is used in most real studios around the world.

Good luck!

My God, the hair is atrocious.

[Nightbat]

Believe it or don't.......yeah, I had a wild idea some years ago for a frame that would allow a mic to move around in front of an amp/cab until you found the sweetest spot. I based it on a computerized measuring machine we have at work that moves on the X, Y, and Z planes. I figure I can hook an Xbox controller to it to run it


Cables and pulleys and Erector Set motors.

For movement I'm also considering some sort of gimbal suspension to allow the mic to not only move on XYZ axis, but also change the angle to which the mic is pointing at the speaker

One thing I still have to dive into is over/under pressure of a cab inside a small closed space which would hinder the speaker's movement and making it 'stiffer' in response
Porting an isolation box really ruins the whole idea, but I was wondering if cone travel could be increased by using a 2x12 and either disabling one or have that speaker's polarity reversed

[Newc]

Thought about that as well, based on what I've been reading. Might be a good idea to increase the size of the box. Thinking of taking it up to 48" long.

Wondering if porting could be done with 4" or larger PVC pipe, but in a 4 foot or more length, maybe dispersing it into a smaller secondary isolation cab that was completely empty. PVC's density should give it inherent soundproofing quality, but wrapping it in one of the blankets might be a good idea as well.

As for the mic "spider web", my idea took into account using the common mic clip that screws onto the stand. It would attach to the moving "probe", so you could still get the full range of tilt. You'd be able to rotate the clip and keep it tight with one of those gear-shaped/notched collars.

However I'd also like to have some sort of coordinate system and software that you could save as presets when you found various sweet spots.

[jspeed]

This may help choosing
http://www.bobgolds.com/AbsorptionCoefficients.htm

+1

Nice chart, it shows exactly what I said earlier on using thick Rockwool covered in burlap on the inside of the mic area.

It’s the same thinking that goes into studio design, that being…. reducing or eliminating reflecting wave frequencies at the listening position. (Or in this case we’re talking microphones)

Using blankets or foam crap is really just a half-ass way to build a real studio control room, an exceptionally great isolation box will have the same type of sound absorption materials as you’ll find in a real recording studio control room.

To get an “ISO” box right, you need to remove all reflective surfaces from the microphone’s “ears”; this will allow the mic to hear only the source…… the speaker/cab.

A friend & I built one for his home studio a few years ago, ½” birch furniture grade plywood, lots of thick Rockwool covered with burlap all over the inside, ozite on the lid seams to seal it tight, Penn valance spanning latches and 6” locking casters. You could crank a JCM800 it to 11 and it wouldn’t sound any louder than a kitchen TV at listening levels on the outside.

My 2 cents fellas, over & out... all the best!

[jspeed]

Thought about that as well, based on what I've been reading. Might be a good idea to increase the size of the box. Thinking of taking it up to 48" long.

PVC's density should give it inherent soundproofing quality, but wrapping it in one of the blankets might be a good idea as well.
.

If you can get away with it, the more box length the better.
You don't just want to reduce outside volume, you should be more concerned with that it will sound like to the mic on the inside.
Sound waves = energy.
If you want the inside of the box to sound natural, you need to reduce the energy of the waves bouncing around inside the box; foam & blankets aren't gonna do that.

Check the link Nightbat posted, it'll help you see what we're talking about more.

[Newc]

nvm - data missing from chart

I've got enough floor space for the longer box, but that's apt to change. The mic will be close to the grille like it is now, but not right on it. It's about 4" from the grille right now, maybe more, haven't measured, and I'm happy with the sound coming through the monitors as compared to what's coming out of the cabinet. You reach a point where the mic only hears the cabinet and not the room due to the volume, so the larger box length is mostly so I can have room for the mic on a stand in the box and the material behind it. As well, the bigger the box, the more flex the speaker can have due to it not being ported.