I built bass traps a few months ago with help from the good people on this forum. I made them from 4" mineral wool and framed them in corner bead. I glued FSK to the front of them with 3M spray glue. At first I thought I'd wrap them in landscape fabric but after a wrapped a couple of them this way, I didn't like how they looked. I then put muslin over the landscape fabric and wrapped all the rest of my traps in just muslin.
Here is my question: Is it too much to have two of the traps wrapped in landscape fabric and muslin?? Could this hamper the traps from absorbing some bass??
The two traps I wrapped in landscape fabric and muslin are both 8' tall and go from floor to ceiling in two of my corners. And again both of these traps have FSK spray glued to the mineral wool panels under the two layers of fabric to reflect some highs back into the room. Should I unwrap the muslin and remove the landscape fabric and then reglue the muslin to the trap??

I've also taken some ultratouch cotton and stuffed it behind all my bass traps which helps a lot too. I'm recording in a small room so I'm trying to make sound as good as it possibly can. My studio is basically 11x11. Thanks for any advice.

I think you're OK. The only thing I'd be concerned with is all the cloth potentially absorbing more highs than you want. But really, just some landscape cloth and thin muslin shouldn't hurt that much either.

Bryan

If you have used an FSK facing, I doubt there is "too" much high frequency absorption to concern yourself with. The materials you mentioned are pourous (quite pourous in fact) and you should see little if any impedence jump from the fabric alone according to my lab tests. Now, the FSK could do quite a bit to enhance the famed "100hz" peak but some see this as "favorable" because the resulting spike "looks" impressive.

To offer a better opinion on what you can expect in terms of performance, knowing the thickness of said landscaping material (cloth) might be helpful. The package should list the "weight" of the material by GSM if made outside the USA and by US unit measurements if made within the USA.

In the end, and depending also on the density of your mineral wool, you might just be peachy.

Enjoy,