Some of you may remember back when I finally got my HT room finished and got my BFD all setup that along the back wall I have a huge 10-12db rise at approximately 30hz. Some folks kinda like it while sitting back there but I know it's not uniform and correct so it has been bothering me somewhat.
I've given some thought to it and in discussing this with a technical engineer at an acoustical lab he has made a suggestion that I use the stuffed rear corner as a bass trap by cutting out a port in that corner wall. He says this might work but he couldn't guarantee anything. Obviously he couldn't get into the technical details of what size port/hole because it would have envolved me giving him a lot more particulars and him having to do some figuring that I don't think he really wanted to get into. Anyway he left me scratching my head.
I thought I'd try to give you guys the particulars and see if you might have any suggestions to if this would work and what size hole I might start with.
Here's a layout of the corner:
Basically you can see the size of the stuffed corner is 28" in width on the inside of the room with the 2 outside edges being approximately 22" in width. As you go inside the stuffed area it is not sealed off from the staggered studding throughout the walls thus any frequencies that enter into this cavity will travel not only into the cavity but into the walls as well. The ceiling part is sealed.
Here's a pic of the wall with the section highlighted in lime green:
Not easy to draw a straight line. Anyway... somewhere on that section my plan is to cut out a hole exposing the stuffed cavity. Since it's 28" wide and I need room to attached a fabric covering (or cover it with an acousitcal panel) I don't want to cut the hole any wider than about 20".
The question is what height to start with.
I know I could simply start out with say a 12" H X 20" W hole and do some testing and then go bigger if needed... but before I go cutting a hole in the wall I'd kinda like to know if you guys think that this sort of trap could nab a 30hz frequency and not cause a lot of other problems like snatching too much of my bass.
I've given some thought to it and in discussing this with a technical engineer at an acoustical lab he has made a suggestion that I use the stuffed rear corner as a bass trap by cutting out a port in that corner wall. He says this might work but he couldn't guarantee anything. Obviously he couldn't get into the technical details of what size port/hole because it would have envolved me giving him a lot more particulars and him having to do some figuring that I don't think he really wanted to get into. Anyway he left me scratching my head.
I thought I'd try to give you guys the particulars and see if you might have any suggestions to if this would work and what size hole I might start with.
Here's a layout of the corner:
Basically you can see the size of the stuffed corner is 28" in width on the inside of the room with the 2 outside edges being approximately 22" in width. As you go inside the stuffed area it is not sealed off from the staggered studding throughout the walls thus any frequencies that enter into this cavity will travel not only into the cavity but into the walls as well. The ceiling part is sealed.
Here's a pic of the wall with the section highlighted in lime green:
Not easy to draw a straight line. Anyway... somewhere on that section my plan is to cut out a hole exposing the stuffed cavity. Since it's 28" wide and I need room to attached a fabric covering (or cover it with an acousitcal panel) I don't want to cut the hole any wider than about 20".
The question is what height to start with.
I know I could simply start out with say a 12" H X 20" W hole and do some testing and then go bigger if needed... but before I go cutting a hole in the wall I'd kinda like to know if you guys think that this sort of trap could nab a 30hz frequency and not cause a lot of other problems like snatching too much of my bass.
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