Limp mass max weight and wave guide efficiency
Posted: Fri May 11, 2018 4:40 pm
Hi everyone,
First of all big thanks to John. There's some amazing stuff in this forum.
I have two questions:
1: Is there some maximum suggested kg/m2 for the membrane of a bass trap? From my understanding, the efficiency (or at least the bandwidth) of the membrane trap goes down when increasing the membrane mass instead of trap depth. I'm looking for trapping 39Hz with a 22cm deep trap with some waveguides inside. This means that I would need to use about 8-9kg/m2 membrane there. I'm planning to use 7kg/m2 MLV-like material and add weight to it while tuning. Is this effective trap at all because of the high mass of the membrane?
2: Is there any rule of thumb for what is the effect of waveguides in porous absorbers? Can we say that porous absorber with waveguides acts like 20% deeper porous absorber without waveguides or so?
Cheers from finally sunny Finland!
Vesa
First of all big thanks to John. There's some amazing stuff in this forum.
I have two questions:
1: Is there some maximum suggested kg/m2 for the membrane of a bass trap? From my understanding, the efficiency (or at least the bandwidth) of the membrane trap goes down when increasing the membrane mass instead of trap depth. I'm looking for trapping 39Hz with a 22cm deep trap with some waveguides inside. This means that I would need to use about 8-9kg/m2 membrane there. I'm planning to use 7kg/m2 MLV-like material and add weight to it while tuning. Is this effective trap at all because of the high mass of the membrane?
2: Is there any rule of thumb for what is the effect of waveguides in porous absorbers? Can we say that porous absorber with waveguides acts like 20% deeper porous absorber without waveguides or so?
Cheers from finally sunny Finland!
Vesa