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  Topic Review (Newest First)
04-26-07 08:36 PM
F1 fan
Re: Bass traps or EQ

Quote:
Tigerkn wrote: View Post
Hello F1 fan,

If it is not too much trouble, could you please post steps of making it and materials also cost?
Your help is greatly appreciated!
Kev.

Hi Kev,no trouble at all.These are very easy and inexpensive to build.

1)The frames consist of only four pieces-Using 1/2" plywood I cut two triangles one for the top,and one bottom.Then the support and back pieces were cut to length.Measure and see what the maximum height and width that you can fit into your corners.The bigger the better.

2)For assembly I used some nails and wood glue. see post #15 in this thread for a pic of the finished frame.As an alternative you could use crg's method (shown in post #59) of building the frames.

3)Cut mineral wool or fibreglass into triangles the exact same size as the top and bottom panel of the frame.I used a utily knife and one of the plywood triangles as a cutting guide.Stack them on top of each other until frame is full .For reference see crg's pics in post #62.

4)Cover the front (and top or bottom if needed)with some acoustically transparent material that matches with your decor.I used an electric staple gun to staple the material to the back of the frames.

approximate costs.

1 bag 3" Roxul brand mineral wool - $25

plywood -$25

cover material $10-15

I hope that is helpfull.
04-26-07 07:51 PM
F1 fan
Re: Bass traps or EQ

Quote:
gto wrote: View Post
Its not easy to explain with my poor english.

Lets take a pic.


Hope this is understandably?

br Gerd
OK gto now I see what you meant. I would think further gains would be had if you also filled the big air gap with some more mineral wool or fibreglass thus making it a cube instead of a triangle.That would substantially increase material thickness.
04-26-07 07:20 AM
gto
Re: Bass traps or EQ

IMHO its a question of what your room needs.
In kind of acoustic principles/physics its clear, that you loose absorbtion in deeper frequencies.
But out of my experiences its a question of what your measurings show you.
If you want to perform well, then you should look for a evenly respons over a max frequencierange.
And only a good measuring with RT60 shown on watterfall will tell you whats needet.

No question, that it is allways a balance between waste room, how it looks like and how far I am willing to go.

br Gerd
04-26-07 06:08 AM
bpape
Re: Bass traps or EQ

Yes, that would buy you a little bit of extra extension at some angles of attack - at others it would be pretty much the same or less. Think of the waves that come down hugging the side walls. How much absorbtion do they go through turned around vs. tucked in the corners?

Plus, tucked in the corner take up a LOT less room and still provide excellend absorbtion.

Bryan
04-26-07 05:02 AM
gto
Re: Bass traps or EQ

Quote:
F1 fan wrote: View Post
Hi gto,sorry Im not really sure what you are asking,but to clarify it is triangular shaped so it is meant to fit tight into a corner with the absorbative side facing into the room.
If it were a regular 4" flat panel then straddling it across a corner so that there was an air space behind it would increase it's effectiveness.
Its not easy to explain with my poor english.

Lets take a pic.


Hope this is understandably?

br Gerd
04-26-07 02:00 AM
Tigerkn
Re: Bass traps or EQ

Hello F1 fan,

If it is not too much trouble, could you please post steps of making it and materials also cost?
Your help is greatly appreciated!
Kev.

Quote:
F1 fan wrote: View Post
Here is the finished product.I plan to mount them on the upper half of the corner and may add a solid pine end cap on them to dress them up a bit.
04-25-07 10:02 PM
F1 fan
Re: Bass traps or EQ

Quote:
gto wrote: View Post
Is there a reason why you built it not with facing the corner in the room? Would be more efficient.
Lamda 1/4

br Gerd
Hi gto,sorry Im not really sure what you are asking,but to clarify it is triangular shaped so it is meant to fit tight into a corner with the absorbative side facing into the room.
If it were a regular 4" flat panel then straddling it across a corner so that there was an air space behind it would increase it's effectiveness.
04-25-07 11:08 AM
gto
Re: Bass traps or EQ

Quote:
F1 fan wrote: View Post
Here is the finished product.I plan to mount them on the upper half of the corner and may add a solid pine end cap on them to dress them up a bit.
Is there a reason why you built it not with facing the corner in the room? Would be more efficient.
Lamda 1/4

br Gerd
04-25-07 10:32 AM
bpape
Re: Bass traps or EQ

Agreed. Looks like 4 bands of parametric would bring things pretty nicely in line. The treatments will help quite a bit and deal with the decay time part of the equation. The EQ is the finishing touch to deal with the last few stubborn peaks that can be caused by any number of things.

Bryan
04-25-07 09:52 AM
brucek
Re: Bass traps or EQ

Quote:
Attached are before and after REW graphs
crg, I believe that you are using the old Radio Shack meter calibration file. Best to use the new one that associates with your model found here. The files are new in the last month after Sonnie had his ECM microphone professionally calibrated and we re-did the files.

I really think your low frequency response can be bettered by equalization. You have a nasty peak around 28Hz and others that could be easily corrected with a BFD. There's nothing wrong with correcting very low frequency peaks with equalization. Certainly well executed acoustic treatment improves response over a larger physical area than does EQ, but at very low frequency peaks (such as you appear to have), the size of the treatment would be huge. A cut filter with a matching Q and inverse gain would help reduce the peak.

When you post your graphs use a vertical scale of 45dB-105dB. The RadioShack meter is not reliable above 5Khz, so no use using a horizontal scale that goes to 30KHz. In this case where we are looking for effect of a low frequency mode, perhaps use a horizontal scale of 15Hz to about 500Hz (and measure same to look for low frequency modes).

brucek
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