Will this work ? what frequencies ?

[Stephanc]

Ok I did it again , tried to build my own panels traps ,

(Sometimes is just better to let a pro do it)

They have a 1/2" plywood , 1/2" air space , then 3" of 703 fiberglass insulation. they are 32" by 48" I am going to mount them over a drum set.

Will they be effective ?

If so , generally , what frequencies would they be effective at ?

Thanks

[avare]

Originally Posted by Stephanc

They have a 1/2" plywood , 1/2" air space , then 3" of 703 fiberglass insulation. they are 32" by 48" I am going to mount them over a drum set.

Will they be effective ?

If so , generally , what frequencies would they be effective at ?

They will provide good absorption of direct sound down to ~400 Hz. Below that frequency, the combination of the roll off of the material AND the dimensions of the units no longer being significant, will reduce the absorption. IOW you have a good match of absorbent design and physical size.

They should provide a great addition to your acoustics toolkit!

Andre

[DanDan]

Is that plywood on the outside or inside? If it is on the outside, facing the drums it is a Bass Panel Trap. It should absorb well at and around it's resonant frequency. Elsewhere it is reflective. I would not mount anything reflective, except a really serious diffusor perhaps, above a drum kit. The overhead mics are likely to be up there and the very early reflection would cause horrible comb filtering.
If the plywood is simply the back of the trap, with the OC facing the sound, then don't listen to my crazed ramblings, go with Andre instead.
DD

[Glenn Kuras]

Originally Posted by DanDan

Is that plywood on the outside or inside? If it is on the outside, facing the drums it is a Bass Panel Trap. It should absorb well at and around it's resonant frequency. Elsewhere it is reflective. I would not mount anything reflective, except a really serious diffusor perhaps, above a drum kit. The overhead mics are likely to be up there and the very early reflection would cause horrible comb filtering.
If the plywood is simply the back of the trap, with the OC facing the sound, then don't listen to my crazed ramblings, go with Andre instead.
DD

Agreed!

[Ethan Winer]

Originally Posted by DanDan

Is that plywood on the outside or inside?

This is the key question. Half-inch thick plywood is probably too thick for a panel trap. So I hope that's just a backing. But in that case, quarter-inch plywood (or even thinner) makes more sense.

--Ethan

[Stephanc]

It (the plywood ) is facing down towards the drums , it is covered with fabric, I wanted to use 1/4" but it seemed too thin to hold the frame together. So they are probably not going to do what I thought they would , mostly be a bass trap. I do have the overheads there but am trying the Glyn Johns method , so it's not the usual xy overhead arrangement one is over head (yes some comb filtering ) but one is too the side.

[Stephanc]

Ok They're done , it sounds like I have them built backwards, would this work to salvage the situation , ?

Could I mount some Acoustical foam , on the plywood that is facing down toward the drums, ?? to be more absorbative sp as much as I hate to do it I may have to buy the Auralex to stick on the face of those.

Behind the drum set I will have 2 GIK monster bass traps and a 244 trap and on the sides are wall mount 2" and 4" thick panels of 703 wrapped in Ready Acoustic bags.

Thanks for the awful truth.

[DanDan]

If the plywood is reluctant to go, just reverse them. The plywood would then do little or no harm, maybe some tiny beneifit. Then dress them as SAC suggested.
DD

[Stephanc]

Unfortunately , The plywood is the only thing holding up the 3 24"x32" pieces of 703 OC I'll try to post some pics