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#144089 - 07/25/06 01:53 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: royce73]
royce73 Offline
veteran

Registered: 04/20/05
Posts: 170
Loc: New Jersey
Okay, I turned down the volume on the sub as my first graph showed that my lower frequency were charting a bit higher than my mids and highs. Here is the result:

Now compare my two REALTRAP readingds side by side:

Looks like I fixed the dip at the lower frequencies at addressed the big problem between the 220-260 mhz a bit. A definate improvement.

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#144090 - 07/25/06 02:56 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: royce73]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8290
Loc: Tacoma
Now, here you guys go again trying to quantify "quality". Did the 1960's teach you nothing?

Nice work, Randy. Really fantastic looking, and it makes good sense to me that you would hear an improvement. I'm jealous of you guys that have dedicated rooms.

Quote:

and head over to MarkSJohnson's house



Now THAT is some funny stuff, right there.
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#144091 - 07/25/06 03:29 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: royce73]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa
Wow Royce, that seems like a large improvement over the first graph. Amazing how making minor adjustments to the sub gain and/or moving a few items around in the room make such a big difference. Just placing a throw blanket over to top of leather chairs can make a difference. Ethan Winer on realtraps mentioned a table in front of his couch was skewing results, so he just put a nice doily over the top and that tamed the response.

It appears that you have reduced your overal deviation from about 30dB down to 20dB, and the larger bass peaks appear to have dropped by about 5dB's. This is fun stuff.
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#144092 - 07/25/06 03:46 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: royce73]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5416
Loc: Bowmanville, Ontario, Canada
>>There was a HUGE dip around my crossover point

That is nature's way of saying "fliiip the phaaaaaase switchhhh....". If your sub and mains are out of phase they will cancel at the crossover point and you will get a big dip.

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#144093 - 07/25/06 03:48 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: royce73]
mrnomas Offline
old hand

Registered: 02/16/05
Posts: 86
Loc: Florida
I'm intrigued that the treatments helped with your ~60Hz null. I'm going to be upgrading my treatments soon (just adding more fiberglass in the corners behind existing traps). I've got a 60Hz suckout too. Perhaps I'll see some improvement as well.
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#144094 - 07/25/06 08:50 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: SirQuack]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
Nice job Randy, man those traps look extremely good! I just did get my GIK Tri-Traps in today and due to working late just did get 'em in the corners, wife loves the look and I am enjoying the sound ... a significant difference? Probably not, but man the Axioms are sounding extremely good while playing Joe Bonamassa and the new Los Lonely Boys 'Sacred' CD. Whenever I get the time I'll do a couple of more manual graphs to see if there is a difference there but to my ear everything *seems* to be quite a bit tighter.

Upon searching I have found there must be a million ways and suggestions to *properly* set up the speakers but I did the Rives suggestion of having the mains 1/5 the distance of the room from the front wall which put my 80s 5ft from the front wall and I also put the listening position 38% from the back wall, I had to patiently adjust the toe-in 'till everything just clicked and by George the system is sounding mighty fine. My mains are 11.5 ft apart and the listening position is 13 ft from the mains and center...while listening in 2 ch stereo my son lost a bet over the weekend believing the center channel was playing.

It's amazing just how minute adjustments and tweaking does for the sound, it is fun and the music never sounded better!
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Our Room

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#144095 - 07/25/06 09:12 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: mrnomas]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5416
Loc: Bowmanville, Ontario, Canada
I'm not 100% sure, but I think the before and after graphs also included moving the subwoofer from a corner to the side wall.

Again, suckout at crossover can often be fixed with the phase switch -- that's why it's there.

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#144096 - 07/25/06 10:46 PM Re: My Superchunk Bass Trap Project, Graphs includ [Re: Jordan]
chesseroo Offline
connoisseur

Registered: 05/13/02
Posts: 4829
Loc: western canada
Quote:

I suppose one would want to calculate and compare the standard deviation, variance and the number of outliers (and their magnitude). Oh oh, of course one should always be on guard for "heteroskedaticity".




Now we're talkin!! None of this subjective "hearing" nonsense that everyone keeps talking about.

Actually i think royce has had noticeable improvement towards linearity in his graph by eliminating a huge dip and reducing the magnitude of change in SPL from top to bottom. Whether the increased linearity sounds better is still subjective and obviously difficult to A/B test.

Listen to bridgman, "the phase is all around you, use the phase Luke...use the phase"
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"Those who preach the myths of audio are ignorant of truth."

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#144097 - 07/27/06 12:30 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: SirQuack]
HomeDad Offline
connoisseur

Registered: 12/29/05
Posts: 3301
Loc: Central,California
So Randy, does this mean you will have to do all these tests over again once you get your M80's
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#144098 - 07/27/06 07:20 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: HomeDad]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13337
Loc: Iowa
I've got it figured out, your really WID, under a new alias. ha ha

I'd love some 80's but not sure if it will happen for some time. To late to trade up with Axiom, I've owned them to long. Even though mine are like new, it still has been over a year or so... To be honest, the 60's sound awesome.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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