high density rockwool

[loaf]

it seems that the hgih density 30mm thick rockwool from a uk supplier works out at about 180kg/m3 - is a density that high to be avoided for traps?

[bpape]

Not at all. However, depending on how thick you're going to make the absorbers, it may not be necessary to have that density.

For simple reflection absorbers, it's certainly not nessary - something half that dense will work just fine.

Bryan

[loaf]

thanks, so it's going to absorb some bass, but probably reflect the highs? I was thinking I could maybe attach some acoustic foam to the fronts for a more broadband effect - I am tracking/mixing in the same room..

[matucha]

It won't reflect highs, so there is no need or additional absorber.

[streetbeats]

Originally Posted by loaf

it seems that the hgih density 30mm thick rockwool from a uk supplier works out at about 180kg/m3 - is a density that high to be avoided for traps?

Is this the stuff from wickes?

that high density stuff is much more expensive than the standard slabs they do.

Im unsure as to whether the standard is dense enough though?

[loaf]

yes, is wickes - according to some the 50mm thick cheaper stuff is better for general purpose treatment - I have 5 traps of the 30mm and it doesn't seem to do much for the higher frequencies

[bpape]

It depends on how you use it. For multiple layers for bass absorbtion, the higher density will be fine.

For reflection panels on the side walls with somewhat shallow angles of incidence, the less dense material is preferable.

Bryan

[PepeLuis]

hello, I have been searching threads re diy bass traps and have found some really helpful posts. I have found this product in Wickes (UK) which is 200kg/m3 density. from reading post I understand that this might be too dense for bass traps, is that right?. what I like about this material is that it is relatively rigid (would stand up on its side). it comes in 30mm sheets (pack of 5). my idea is to wrap in plastic (to stop fibres leaking out), then cloth (decorative) then velcro to room corners. I want to avoid making frames and really make it as easy, quick and cheap as possible.If this is too high density would it be better to just use 1 or 2 sheets instead of the 3 together I was planning (ie 90m total).
one other question is whether there is a more fire-safe way of sealing them without using spray glue etc?, maybe fireproofed fabric wrapped round with parcel tape?

any thoughts are well appreciated.
many thanks
Joe.

[Jens Eklund]

Low kg/m3 is worthless.

first reflection panels density and thickness

this type of rock wool could work?