125Hz

EtherForBreakfast

EtherForBreakfast

Hamster Style
Jun 19, 2005
1,012
0
36
OK. Just did a Waves Paz analyzer and my entire room goes NUTS at 125hz. Nuts enough to where it will rattle the strings of my 12string and nylon guitar I have hanging on the opposite wall far far away from me. I have a standard tuned Jackson and if I lightly palm mute/let ring the C at 8th fret of low E it is out of control 125hz resonation MADNESS.

What is the best, and most economical way to kill this insane 125hz Demon?

Here is a screen cap of the Waves Paz anaylzer, you can see that ridiculous spike at 125hz.

HELP? James?

paz.jpg
 
It sounds like you have a standing wave going on, simple to break up with some simple acoustic knowledge but more info on your actual room and test situation is needed, what are the dimensions of you room? Did you use white/pink noise for the test? Also, what materials are the floor, ceiling and the walls made out of/covered in?
 
I will try to sketch the room with MS Paint to give you an idea of what the room is like.

The screen cap is what my i5 on my Boogie 1x12 cab is picking up. I did not use any type of pink/white noise generator.

I'm beginning to think that the closet itself is acting as some sort of massive "tuned" enclosure that loves to throw 120-130hz standing waves back and forth all day long. I suppose an easy test would be to put the cab in the middle of the room and just "chunk chunk chunk" on that C note to see if the problem persists.

Would placing bass traps in all 4 corners even be worth it? At what frequency range do they become ineffective?

I only have one other place to put the cab, and that would be in a bathroom, which is not convenient at all. The closet does a great job of really silencing the cab (treble wise) but the bass is just out of control, and its only a 1x12.
 
Nah.. any guitar. I'm tellin ya' if I do a "light" palm mute on that C at 8th fret low E, its just "BWOO BWOO BWOO BWOO" windows rattle, guitars vibrate, ears hurt... Madness.

B at 7th fret not AS bad, C# at 9th fret tolerable.. C at 8th fret. "BWOOZZHHH BWOOZZHHH BWOOOZZZH"
 
Another thing, on my Nez7 tuned to standard, doing chunks on low B is totally fine. So its not like 120-130hz or BELOW.. its JUST that frequency. "bwooozhh"
 
Try and throw a blanket over the cab, preferably a couple of heavy ones. See if that helps the problem, if so some acoustic diffusers on the walls should solve the problem (you should do a proper room analysis though to make sure you have no problems elsewhere, modes will happen at all the harmonics of the fundamental so 125, 250, 375, 500 etc). If the blanket still doesn't help then raise the cab off the floor and see what happens, if needed try both together. If that still doesn't work then you should still do the room analysis to work out where the problem area is, then you can target/eliminate it.
 
The closet is approx 8' wide x 2.5' deep.

The cab is already sitting on top of a box that I built (originally built to put the guts of a combo chassis and make it into "head" form).

The closet has metal doors. The doors have THICK moving blankets attached to the inside of them via the use of those big metal clips that are used to bungle a big stack of paper together.

In addition to that, all 3 walls of the closet also have the same blankets draped over them. I used nails into the wall, and then clipped the blankets onto the above mentioned clips and hung them from the nails. I also have bundled up blankets in the bottom of each corner of the closet as well.

I've done all that I can, albeit very much "ghetto-ly" with the blankets. I guess it is time to plunk down on some bass traps, and some Auralex knock-off material to really try and deaden the closet.

PS - I have tried to blanket the cab/mic, no help. For some reason, this room, or that closet or a combination of both really want to fuck me over @ 125hz.
 
Razorjack said:
Try and throw a blanket over the cab, preferably a couple of heavy ones. See if that helps the problem, if so some acoustic diffusers on the walls should solve the problem (you should do a proper room analysis though to make sure you have no problems elsewhere, modes will happen at all the harmonics of the fundamental so 125, 250, 375, 500 etc). If the blanket still doesn't help then raise the cab off the floor and see what happens, if needed try both together. If that still doesn't work then you should still do the room analysis to work out where the problem area is, then you can target/eliminate it.
Click to expand...

Hi Razor. I don't think that a blanket will help. This 125Hz prob looks like a normal room resonant mode. The only help will be a basstrap in 2 ore 3 room corners for that frequency.

my 2 eurocent;)
 
Frank'nfurter said:
Hi Razor. I don't think that a blanket will help. This 125Hz prob looks like a normal room resonant mode. The only help will be a basstrap in 2 ore 3 room corners for that frequency.

my 2 eurocent;)
Click to expand...

The blanket was not meant to be a solution, just a way of seeing how the room reacts to a diffused sound. When trying to work out where the resonance is coming from the first thing to do is to try and eliminate the exciting frequencies at source, blankets are used for this when no diffusion panels are available.
 
A blanket will stop short waves frequencies (high frequencies) but 125hz will pass through.
 
~BURNY~ said:
A blanket will stop short waves frequencies (high frequencies) but 125hz will pass through.
Click to expand...

BURNY was faster, hehehe. But yeah, that's right. Blankets will only help at high frequency reflections. You will defenitely need bass traps to elliminate these room modes.
 
~BURNY~ said:
A blanket will stop short waves frequencies (high frequencies) but 125hz will pass through.
Click to expand...

125Hz will pass through but will be scattered slightly more than without the blanket. The idea behind trying a blanket was simply part of a series tests to eliminate possible causes, before just throwing some bass traps in the corners hoping they will work.

Without getting to much into acoustic theory (which I often do) some bass traps 'should' get rid of the problem, but only if the room mode is the problem. It could simply be the cab, I've had the same problem with cabs before and it has been solved by covering the back of the cab (on the inside) with acoustic foam.
 
Cute sitcom names, and restaurant chains aside, should I go to GayTar Center and buy some bass traps? Are they effective at the 125hz range? I suppose they'd need to be 4" thick at the very least?

Also - this whole gig with Auralex being so expensive, what about all of the knock-off material that is sold on the web and on eBay and such. Is Auralex stuff really THAT much more superior?

I bought some of those $30 MoPads for my monitors which was easy enough to handle, but for what I need to treat this closet and the rest of the room would be very expensive if I went with genuine Auralex. I just dumped $300 at a Strip Club... too bad. =)
 
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