Bass traps or EQ - Page 7 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #61 of 79 Old 04-17-07, 06:35 PM
crg
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Re: Bass traps or EQ

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.
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post #62 of 79 Old 04-22-07, 08:14 PM
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Re: Bass traps or EQ

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?
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post #63 of 79 Old 04-24-07, 08:09 AM
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Re: Bass traps or EQ

hey F1, do you have pics of the backsides of your DIY creations?

the corner trap, wall panel, and free standing panels?

Mike C

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post #64 of 79 Old 04-24-07, 08:27 AM
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Re: Bass traps or EQ

Filling with Linacoustic would provide some benefit - though not as much as 703 in the deepest octaves.

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post #65 of 79 Old 04-24-07, 06:59 PM
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Re: Bass traps or EQ

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).
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Bass traps or EQ-corner-trap-covered-front.jpg  

Bass traps or EQ-room1.jpg  

post #66 of 79 Old 04-24-07, 07:26 PM
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Re: Bass traps or EQ

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

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".
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Bass traps or EQ-home-theater-1st-reflection-only.jpg  

Bass traps or EQ-home-theater-1st-reflection-front-corner-traps.jpg  

post #67 of 79 Old 04-24-07, 07:26 PM
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Re: Bass traps or EQ

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

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post #68 of 79 Old 04-24-07, 07:51 PM Thread Starter
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Re: Bass traps or EQ

Quote:
mike c wrote: View Post
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.
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post #69 of 79 Old 04-24-07, 10:23 PM
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Re: Bass traps or EQ

thanks for the info F1.

Mike C

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post #70 of 79 Old 04-25-07, 08:52 AM
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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).

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