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#144169 - 09/14/06 01:46 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: tomtuttle]
Ajax Offline
axiomite

Registered: 12/30/03
Posts: 6250
Loc: Cleveland, Ohio
WHERE?
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#144170 - 09/14/06 04:29 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: RickF]
royce73 Offline
veteran

Registered: 04/20/05
Posts: 170
Loc: New Jersey
Quote:

I did some manual graphing today using the Rives CD and charts and although crude compared to Randy's presentation, I'm curious what you fellas gather from this chicken scratch ... that is, if you are able to read it.




It looks like you have some "suck-out" at the lower frequencies - 25-40. From feedback I received based on my graphs, the suck-out can be addressed in two ways: 1) your sub may be out of phase or 2) you may be running the sub a little hot - try adjusting the sub volume a bit lower. I went with option 2) a the smallest adjustment in volume made a huge difference.

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#144171 - 09/14/06 06:19 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: royce73]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5408
Loc: Bowmanville, Ontario, Canada
Yep, something is funny there. What crossover frequencies are you using, and are you running mains as Large or Small ?

Are you using the sub crossover as well or is it bypassed ?

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#144172 - 09/14/06 08:19 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: bridgman]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
John, all crossover is set to 80, main speakers are set to small and the sub is set to bypass.

I'll double check the settings tomorrow though.
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Our Room

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#144173 - 09/14/06 08:31 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: royce73]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
Royce, thanks for the valuable information and I'll give the RealTraps CD a try ... I did adjust the volume and hopefully if work does not get in the way during the next few days I'll have a couple of more graphs for you to examine. If you do not mind.
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Our Room

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#144174 - 09/14/06 10:53 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: RickF]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13333
Loc: Iowa
I wonder if I'm not running to hot either. Heck, I've got the EP500 set around 7 o'clock and with the Denon mic setup, that put my AVR for the sub at -5dB's. For some reason I always end up turning it up, but probably don't need to. I'm sure my phase is messed up also, and most likely the position of my sub.

I've been playing around the Home Theater Shacks "Room EQ Wizzard". Man for a free download this tool is pretty cool if you have a laptop/pc with sound card. You hook the RS meter up to it, place in position and do various calibrations to your hearts content. I'm thinking about doing some various sweeps for the sub in the 100hz and lower categories from various positions to find the flattest results. I'll be out in Vegas at an IT conference Sunday to Wednesday, hope some of you will be there as well.
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#144175 - 09/14/06 10:56 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: RickF]
royce73 Offline
veteran

Registered: 04/20/05
Posts: 170
Loc: New Jersey
I would love to help. In the meantime, see my before and after graphs for reference.


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#144176 - 09/19/06 04:36 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: SirQuack]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
Randy I ended up relocating our sub woofer from the front wall to the left mid sidewall location...made all the difference in the world and my ears along with a couple of quick graphs are proving it. After months of being bewildered by this 600 by George I do believe we've finally nailed it.

Probably the one biggest difference (besides sounding unbelievable) is that I'm finding that I no longer have an urge to turn up the juice on the sub to mentally make up for the lack of missing LFEs and sonics. What ticks me off is that whenever I placed the sub in the listening position and did the crawl I did find the left mid sidewall location sounded best but didn't believe it was *enough* of a difference to constitute moving it from the front wall...was I ever wrong! Another little item that ticks me off is that Jakeman has been telling me all along to "try a mid sidewall location" and I didn't listen.

I believe that makes Royce, Jakeman and myself with mid sidewall sub placement. I wonder if anybody else has theirs placed in that location?
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Our Room

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#144177 - 09/19/06 07:44 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: RickF]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5408
Loc: Bowmanville, Ontario, Canada
I *would* have my sub placed mid-sidwall months ago but the cable is only a few feet long so I'm gonna have to move the electronics first


Edited by bridgman (09/19/06 07:50 PM)

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#144178 - 09/20/06 08:33 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: royce73]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8288
Loc: Tacoma
I got tired of waiting for somebody to post something else meaningful in this thread so that I could swoop in with post #100.

99 posts about fiberglass on the wall, 99 posts about fiberglass...
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