Lowest Frequency sheetrock reflects?

[Booda]

I've come to the realization my All in One Room needs help.
I seem to have a big spike at 125Hz (@mix spot) & a few areas in the room that all the lows get sucked away (cancelled).
I've been reading many of the super helpfull sites, Sayers, Ethen ect... & am getting somewhat of a grasp... trying to. Possibly thinking of moving and building a proper 3 room studio but right now want to make what I have more optimal. Good place to keep working on my tracking and mixing.

2 things... I'll explain my room but I'm wondering if 125Hz goes through sheet rock or reflects back. & My friend thinks I should put Bass traps outside my room... Does that work as effectively?

These are some clips from a thread that I've been discussing my Dark Recordings http://www.homerecording.com/bbs/showthread.php?postid=824099#post824099

My recordings are clean and clear but sound dead. Everything needs a Lo cut Hi boost all the time.
My Room I Track and Mix in is 10x15 w/ 8'ceiling. Pretty Dead. Carpet on top of cement floor, R-11 insulation on the ceiling and 60% on the walls. There's some sheet rock on each of the 4 walls to bounce some sound around.
The room is Great for band practice just not sure about recording. I thought by having a small room that's dead and relying on Reverbs would be OK.???.
I'm thinking of getting two 4x8 sheets of plywood and setting the entire drum set on it and anything else I track.

I did a Sine Wave test in my room and all was pretty even except at 125Hz. Big Jump. I need to get a Meter of some kind but I was talking w/ my friend and He told me to make some type of Bass trap out of a rubber can (Garbage can like) filled with insulation and put em Outside my Room. He doesn't think My Room holds any low end in, but I told him my House Wall is probably sending it back at the Room. I didn't mention before... The room is a framed room in side a Garage. 3 walls of the garage are just plywood with a couple layers of carpet (yes, I carpeted the whole inside of the garage) the 4th wall being the house. There is 2' between the whole box and Garage walls... The Box is framed with sheet rock on the outside with layers of carpet and the ceiling is just thin plywood again with carpet. The inside of the room has R-11 w/ some sheet rock to give a little frequency . I think the one wall on the House side is what would be sending the Bass back. Is the sheetrock on the outside of the room sending anything back in? My guess would be the 125Hz.

If you have any input on this I'm gratefull. I've wanted to post this for a month, just didn't know how to go about it

Thanks,
B.

 

[Ethan Winer]

Booda,

> I seem to have a big spike at 125Hz <

This is common in small rooms, as are dips in the response. You need bass traps to solve that. Bass traps inside the room, not outside!

You do have a valid question about which frequencies go through a sheetrock wall. I don't have an exact answer for you, but:

1) It depends on the mass of the wall, how thick the sheetrock is.

2) I'm sure 125 Hz is being reflected in the room unless your sheetrock is really thin, like 3/8 inch or less. The proof is that you are having problems at that frequency. If 125 Hz were passing through the walls, you wouldn't have peaks and dips there.

--Ethan