AVS Discussions

Bass traps?

bmoney

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Bass traps?
« on: November 13, 2016, 07:38:09 AM »
whats the true deal with these...I have heard they need to be 4-6' thick to really attack the FR we need that are troublesome?

so what say you?  do chunky corner traps work? 

laugsbach

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Re: Bass traps?
« Reply #1 on: November 13, 2016, 10:38:07 AM »
I have a lot of acoustical treatments in my room. The entire front wall is treated with Roxul and 9" of pink fiberglass in each of the front two corners from floor to ceiling. I really like a dead space as I watch 95% movies and 5% music. I have nine 18" subs spread around the space to help with the low frequency response...

The bottom line is it measures very well and sounds very, very well to my ears... :)

bmoney

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Re: Bass traps?
« Reply #2 on: November 13, 2016, 11:13:26 AM »
do you have measurements?

ellisr63

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Re: Bass traps?
« Reply #3 on: November 13, 2016, 06:31:40 PM »
I have a lot of acoustical treatments in my room. The entire front wall is treated with Roxul and 9" of pink fiberglass in each of the front two corners from floor to ceiling. I really like a dead space as I watch 95% movies and 5% music. I have nine 18" subs spread around the space to help with the low frequency response...

The bottom line is it measures very well and sounds very, very well to my ears... :)
I agree... I have 3" of Roxul on our front wall, plus 4" on all side, and ceiling 1st reflection points. We did our rear wall with 9" of Roxul, ans also made triangles for the rear corners floor to ceiling. Then we used Denim for out soffets all around the room. I enjoy the way everything sounds including the music. I find the instruments are floating is space more with a room that is closer to dead than live.
Yamaha CX-A5100, (3) diy synergy horn 2 ways,, 4 JBL 8340As, 4 JBL 8320s, PS3, XBoxOne, Monoprice speaker wire, and XLR cables, Redmere HDMI cables, Monster HTPS7000, 2 Furman filters, SeymourAV 195" diagonal scope screen, Panamorph UH-480, Darbee Darcet, diy 14 channel Ice Power amp

bmoney

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Re: Bass traps?
« Reply #4 on: November 14, 2016, 05:08:30 AM »
my room is pretty dead too ...was listening to music in there yesterday and man it sounds good!

just wondering about the bass traps

ellisr63

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Re: Bass traps?
« Reply #5 on: November 14, 2016, 08:41:44 AM »
my room is pretty dead too ...was listening to music in there yesterday and man it sounds good!

just wondering about the bass traps
I believe bass traps will make the bass tighter...or at least they did in my room.
Yamaha CX-A5100, (3) diy synergy horn 2 ways,, 4 JBL 8340As, 4 JBL 8320s, PS3, XBoxOne, Monoprice speaker wire, and XLR cables, Redmere HDMI cables, Monster HTPS7000, 2 Furman filters, SeymourAV 195" diagonal scope screen, Panamorph UH-480, Darbee Darcet, diy 14 channel Ice Power amp

bmoney

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Re: Bass traps?
« Reply #6 on: November 14, 2016, 08:58:25 AM »
thats not the question :) its i heard that they need to be at least 4-6' thick to hit the below 100Hz that is the most troublesmoe

ellisr63

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Re: Bass traps?
« Reply #7 on: November 14, 2016, 09:10:45 AM »
thats not the question :) its i heard that they need to be at least 4-6' thick to hit the below 100Hz that is the most troublesmoe
We made ours 9" thick on our rear wall, plus we have corner traps, and soffet traps that are 2' deep. It def made a difference in our room, and I have zero regrets on making them.
Yamaha CX-A5100, (3) diy synergy horn 2 ways,, 4 JBL 8340As, 4 JBL 8320s, PS3, XBoxOne, Monoprice speaker wire, and XLR cables, Redmere HDMI cables, Monster HTPS7000, 2 Furman filters, SeymourAV 195" diagonal scope screen, Panamorph UH-480, Darbee Darcet, diy 14 channel Ice Power amp

Re: Bass traps?
« Reply #8 on: November 14, 2016, 12:41:40 PM »
They made a big difference for my room. The bass was very muddy and rumbly before. After treating the room the bass is much tighter and refined sounding.
Equipment list:
Video: JVC RS500, 138" Elite EZ Frame 2:35:1 Screen, Oppo UDP-203, DirecTV Genie,
Audio: Denon X4000, Mains: Paradigm Prestige 85F, Center: Paradigm Prestige 55C Sides: Paradigm Monitor 7 V6, Rears: Polk TSI100, Atmos: ELAC A4 (2) Subwoofer: HSU VTF3 MK4.
Other: Monster Power HTS-5100, GIK Acoustic Room Treatments, HD Fury Linker

laugsbach

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Re: Bass traps?
« Reply #9 on: November 15, 2016, 07:04:36 AM »
do you have measurements?

I do...I did a quick look using my OmniMic after installing the new AVR because it had a different version of Audyssey vs. my old Onkyo AVR. The FR looked good and I didn't save it because I usually wait 30 days after an AVR change before I fire up REW to really dial it in. I have changed laptops since my last saved measurement and will fire up the old lap and DL the picture of the FR for you...

laugsbach

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Re: Bass traps?
« Reply #10 on: November 15, 2016, 07:09:34 AM »
I find the instruments are floating is space more with a room that is closer to dead than live.

Good point! I have quite a few concert Blu-ray titles with hi-rez audio and it feels like a live performance! When I do listen to music, I like 2 channel hi-rez audio...the room fills with sound and quite a few times I am checking the AVR to make sure only two speakers are playing!  :)

ellisr63

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Re: Bass traps?
« Reply #11 on: November 15, 2016, 09:17:31 AM »
Good point! I have quite a few concert Blu-ray titles with hi-rez audio and it feels like a live performance! When I do listen to music, I like 2 channel hi-rez audio...the room fills with sound and quite a few times I am checking the AVR to make sure only two speakers are playing!  :)
So very true... You don't know how many times I have had to get up, and check to make sure the surrounds are not on when playing my ripped SACDs!
Yamaha CX-A5100, (3) diy synergy horn 2 ways,, 4 JBL 8340As, 4 JBL 8320s, PS3, XBoxOne, Monoprice speaker wire, and XLR cables, Redmere HDMI cables, Monster HTPS7000, 2 Furman filters, SeymourAV 195" diagonal scope screen, Panamorph UH-480, Darbee Darcet, diy 14 channel Ice Power amp

Re: Bass traps?
« Reply #12 on: November 24, 2016, 08:43:23 PM »
I agree... I have 3" of Roxul on our front wall, plus 4" on all side, and ceiling 1st reflection points. We did our rear wall with 9" of Roxul, ans also made triangles for the rear corners floor to ceiling. Then we used Denim for out soffets all around the room. I enjoy the way everything sounds including the music. I find the instruments are floating is space more with a room that is closer to dead than live.

Do you have any photos of your wall treatments?  I'm also curious as to what type of Roxul you used. 

ellisr63

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Re: Bass traps?
« Reply #13 on: November 24, 2016, 09:59:45 PM »
Do you have any photos of your wall treatments?  I'm also curious as to what type of Roxul you used.
All I have are the pics of my theater... The bass traps are covered with GOM material. The Roxul we used was R60, and R80 Rockboard. It is green in color and is 2" or 3" thick, and is semi hard. It is fireproof too, which is another plus. I believe it came in in bundles of 6 or 8(2' x'4') sheets. Our first reflection points are 2 layers of 2", back wall bass traps are 9" thick, front wall behind our screen is 2" thick...all Roxul R60/R80 Rockboard.
« Last Edit: November 26, 2016, 09:10:44 AM by ellisr63 »
Yamaha CX-A5100, (3) diy synergy horn 2 ways,, 4 JBL 8340As, 4 JBL 8320s, PS3, XBoxOne, Monoprice speaker wire, and XLR cables, Redmere HDMI cables, Monster HTPS7000, 2 Furman filters, SeymourAV 195" diagonal scope screen, Panamorph UH-480, Darbee Darcet, diy 14 channel Ice Power amp

Re: Bass traps?
« Reply #14 on: November 25, 2016, 10:28:51 PM »
whats the true deal with these...I have heard they need to be 4-6' thick to really attack the FR we need that are troublesome?

so what say you?  do chunky corner traps work?

Yes, they do work.  They work because the pressure along the boundary (and greater along the juncture of two or more boundaries) is the greatest.  Fiberglass absorbers work better with air movement, and since the maximum air pressure along the boundary indicates little or no movement.  How they work is that at a given depth, the air is still moving before it reaches zero velocity.  The effectiveness is not at the boundary but at some distance away from the boundary.  Therefore the pressure is reduced.  Does it eliminate resonance altogether at the boundary?  No.  Pressure still exists, but the trap may be reduced relative to the room's low frequency SPL where it no longer is audible in relation to the direct sound.  However, what frequencies they are most effective at is the question.  The thicker they are, the lower the frequencies they may effect.  It is more effective to engineer a bass trap due to its much larger size and low frequency impact on resonating frequencies.  The frequencies that are most problematic will be a function of your room dimensions, and are often referred to as room modes. 
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