Gobo design for maximum bleed reduction vs. flexibility

I've spent the last hour looking through this site for information of actual performance data for gobos and haven't found any. I want to make some gobos for the purpose of attenuation (bleed reduction) between instruments in a tracking room. I am interested in attenuation over flexibility, meaning I don't need a "reflective side". Also - it seems to me the reflective side would probably introduce comb filtering, so I just want to avoid it. The gobos would be 4'x2' and could be stacked. I am thinking a 3/4" or 1" MDF core with 4" of rockwool on each side. No air space between the Rockwool and MDF. Is this the best way to maximize isolation? Any potential problems? Other ideas? THANKS!

That's pretty well the way to go Tim. To get proper isolation to the floor make up some wheels like this. cheers john

thank ya!

John.. have you seen those metal plate online anywhere.

No I haven't. But any metal shop could knock them up.

that's what I was thinking too. I'll be on the lookout at local stores to see if any thing comes close. It would be easy to drill hole for the caster wheels

hey there, you might want to consider putting in a layer of sheetrock/drywall on each side of the MDF just for mass, that extra mass might improve isolation some. rockwool | sheetrock | MDF | sheetrock | rockwool Just a thought....

First post here. Excellent info here BTW. I gotta say though that I was inspired by timmcallister & jwl to build these gobos with some minor changes. http://riffster.com/gobos/gobo.htm I used 1x10's instead of 1x8's and since I had unlimited access to ceiling tile I used this brand - Capaul Commercial brand 2" medium density fiberglass, NRC 1.0. Anyone here use this stuff? Not sure if these are up to par but they would be simple enough to remove. My 2x4 gobo weighed in at around 48lbs which isn't too bad and am kinda glad that I didn't use jwl's suggestion by adding sheetrock just for the excessive weight (good idea, but too heavy for me) Thanks again for the excellent info here and maybe one day I'll build myself a real studio.

riffster wrote:

First post here. Excellent info here BTW. I gotta say though that I was inspired by timmcallister & jwl to build these gobos with some minor changes. http://riffster.com/gobos/gobo.htm I used 1x10's instead of 1x8's and since I had unlimited access to ceiling tile I used this brand - Capaul Commercial brand 2" medium density fiberglass, NRC 1.0. Anyone here use this stuff? Not sure if these are up to par but they would be simple enough to remove. My 2x4 gobo weighed in at around 48lbs which isn't too bad and am kinda glad that I didn't use jwl's suggestion by adding sheetrock just for the excessive weight (good idea, but too heavy for me) Thanks again for the excellent info here and maybe one day I'll build myself a real studio.

riffster - the gobos look sweet!

sweet. :lol: