Stopping bass requires physical decoupling and mass, lots of mass. Stopping is relative, any given type of treatment will attenuate different levels at each frequency.A thick, dense door is a start. A double set of dense doors with a gap between is better. Don't forget about the floors, walls, windows, ceiling, etc. Bass behaves more like a pressure wave than a light ray.
A friend of mine recently took over a venue here in Denver, and has been having some trouble with noise complaints from a neighboring apartment building. It's primarily a venue for DJs and electronic music, specifically styles that feature a lot of low bass - quite a bit more 30-50hz than even typical electronic music. The system in the main room has 8 Othorns for subs, in a line on the floor across the front of the stage. The capacity for that room is around 400 people.
A heavy, thick, sound deadening curtain hanging over this door can also sometimes help.
Unless the curtain is REALLY THICK, it is going to do very little to nothing for the sub freq.Yes those can help at mid and high freq, but as the freq goes lower, materials need to get larger and heavier to do any good
Ivan...If this door exits directly to the outside, how would it work to put a 90 degree bend in the path by building on an 8' x 16' addition, beefing up the original door as suggested and adding another properly heavy door 16' to the side? Addition could be block, concrete or other massive material.I know those LLF waves push hard, but wouldn't a bend help even then?
Hi all, Haven't posted on here in years because I sold my sound rig and got out of that side of the music biz. But I'm trying to help a friend with a problem, and this seems like the best place to find real answers from people who know a lot more than I do.A friend of mine recently took over a venue here in Denver, and has been having some trouble with noise complaints from a neighboring apartment building. It's primarily a venue for DJs and electronic music, specifically styles that feature a lot of low bass - quite a bit more 30-50hz than even typical electronic music. The system in the main room has 8 Othorns for subs, in a line on the floor across the front of the stage. The capacity for that room is around 400 people.The building is mostly brick/concrete, so it's overall pretty good at holding in the bass frequencies, but the side of the room closest to the street has an emergency exit: ________________________________ | __________________ | S | | STAGE | | T | |__________________| | R X SUBS | E | | E | | T | | | | | | |________________________________| X is the emergency exit door.(not to scale)They've experimented with different sub placements, and the cluster on the floor seems to be the best at directing as much of the bass energy as possible forward onto the dancefloor, and minimizing the amount of bass washing to the street side - but it's not enough. The emergency exit door leaks a huge amount of bass. They are working on reinforcing the frame and wall around the door, sealing up gaps, etc. But it's pretty obvious that that's not going to be enough, because the door itself is just a fairly light wooden door. Unfortunately, taking the door out and sealing the hole with bricks isn't an option, because it needs to be a functional emergency exit.So my question is: what is the best material for door construction, to stop large amounts of very low frequencies? Would a heavy steel reinforced door make a big difference? Or a solid door of a dense wood? Lead core/reinforced? I assume the higher the density, the better, but I'm just not sure what's available to buy (or feasible to build). I don't believe the door needs to have any specific emergency exit function, like triggering an alarm when opened or anything, it just need to be a functional door.I've done a bit of googling, and everything I've found about soundproof type doors is focused on more typical applications - noisy neighbors, sleeping kids, etc. I haven't found anything that deals with trying to stop very low, very loud bass.So if anyone has experience or insight, I'd be very grateful!
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