Home Theater Forum and Systems banner

61 - 79 of 79 Posts
C

·
Guest
Joined
·
0 Posts
Thanks for the compliments. Lucky for her she looks like her mother.

Looks like it will take a few weeks for the 703 to get here so I'll post more pics then.
 
C

·
Guest
Joined
·
0 Posts
The fiberglass came in sooner than I thought it would. I cut it up and filled the cavities of the two 88" ones today. I had 1 panel left and set it in the front of the smaller 48" trap. Used a utility knife and electric carving knife as suggested elsewhere.

I have some left over 1/2" linacoustic that I hoping to attach to the front so that when I cover it it will produce a smooth surface. Also, while I understand its best to fill the cavity of the 48" in corner trap, especially since its only 1 panel 2" thick, will filling it with left over linacoustic work well or is there somethingelse I should consider that I can get from HD or Lowes?
 

Attachments

·
HTS Senior Moderator
Joined
·
5,288 Posts
Filling with Linacoustic would provide some benefit - though not as much as 703 in the deepest octaves.

Bryan
 
C

·
Guest
Joined
·
0 Posts
Well I finished the two larger traps. I did not use GOM due to expense and used burlap instead. I was largely pleased with the finished results except the edges. I may re-wrap it later after working on my technique a bit with the smaller trap.

I think my mistake was that I cut the top and bottom of the frame for exactly a 24" width & 17" sides. When I cut the 703, the front corners extend just bit past the frame. For the smaller frame I am going to make plates an inch or 2 longer to see if that will work.

Any way attached are some pics. Once in the room they really blend in nicely. I finished before the wife got home. Took her down to the room and she did not immediately detect what was different (a major plus).
 

Attachments

C

·
Guest
Joined
·
0 Posts
I recalibrated the system and got to listened to a few tunes (Neena Freelon - Soulcall) before the wife callde me to eat. This is a piece of work I enjoy lstening to every now and then. The cello on Better Than Anything seems to have more definition and a little more punch. Good start1:bigsmile:

Attached are before and after REW graphs. The before was with 1st reflection point and rear traps in place. "After" adds front corner traps to the "Before".
 

Attachments

·
HTS Senior Moderator
Joined
·
5,288 Posts
Lookin good! Yeah - it's not an exact science. An extra .5" here and there will gain you a ton of looks. Though, I will say that they look nice in the room

Bryan
 

·
Registered
Joined
·
472 Posts
Discussion Starter #68
hey F1, do you have pics of the backsides of your DIY creations?

the corner trap, wall panel, and free standing panels?
Sorry Mike I don't have pics of the backs but if you look at post #15 in this thread you can see how the frame of the corner trap covers the back almost completely.The free standing panels are open in the back except for 2 4"wide strips of hardboard (masonite) runing from top to bottom on each side to hold the mineral wool in place.The backs of the wall panels are completely covered with masonite.

crg,those traps do blend in nicely with the room.It looks like you have a real nice setup.:T
 

·
Registered
Joined
·
7,514 Posts
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
 

·
HTS Senior Moderator
Joined
·
5,288 Posts
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
 
G

·
Guest
Joined
·
0 Posts
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 :reading:

br Gerd
 

·
Registered
Joined
·
472 Posts
Discussion Starter #73
Is there a reason why you built it not with facing the corner in the room? Would be more efficient.
Lamda 1/4 :reading:

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.
 
T

·
Guest
Joined
·
0 Posts
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.

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.
 
G

·
Guest
Joined
·
0 Posts
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.:crying:

Lets take a pic.:bigsmile:


Hope this is understandably?

br Gerd
 

·
HTS Senior Moderator
Joined
·
5,288 Posts
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
 
G

·
Guest
Joined
·
0 Posts
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
 

·
Registered
Joined
·
472 Posts
Discussion Starter #78
Its not easy to explain with my poor english.:crying:

Lets take a pic.:bigsmile:


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.
 

·
Registered
Joined
·
472 Posts
Discussion Starter #79
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.
 
61 - 79 of 79 Posts
Top