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I've been playing with the wave alignment equation (3A=B+C+D) that a lot of SPL guys use for enclosure design for a wall setup in their SPL systems. I was wondering, what is the difference between using this equation and just building an enclosure tuned to the resonant frequeny of the cabin? It seems to me that both enclosures would be tuned to the same frequency, so why wouldn't you get the same results from either enclosure?
-------------------- Cory Rainge Team Art of Noyze 1990 Honda Civic Hatchback aka Lil Hell (...literally...NO AC!) Slap DB Stk 1-160 Champion Posts: 25 | From: Ellenwood, GA | Registered: Apr 2002
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posted
how does this equation work? if you dont mind me asking... or is there a post on this previously?
Posts: 1854 | From: freezing in FAIRBANKS ALASKA | Registered: Aug 2000
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posted
keep in mind, this is only to point you in the right direction for spl... it is under no circumstances absolute. it is a good way to give you your reference enclosure, and then do trial and error on your port from there.
posted
Hey cory! You know Ive been testing with my truck, and I came up with the same questiion. When I reduced the depth of my box I went from peaking at 50hz doing a 152, to 62hz doing a 154, with one of my amps. And I was wondering was the gain due to the higher frequency, or that the wave is coming into better alignment. Im going to be doing some more testing this week hopefully I can get it to a 156 with just the one amp and tweeking some more stuff. Have you turned your system on yet?
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Wow, 154 with 1 amp so far, congratulations so far Ben. Looks like that will beat our 141.7 from Friday night. You should have brought the truck just to beat the guy with the 4 L7 15s talkin all the smack with his 153. Good luck to you this season.
-------------------- Walkin' the dogs, and leadin' the puppies
quote:Originally posted by Big Ben: Hey cory! You know Ive been testing with my truck, and I came up with the same questiion. When I reduced the depth of my box I went from peaking at 50hz doing a 152, to 62hz doing a 154, with one of my amps. And I was wondering was the gain due to the higher frequency, or that the wave is coming into better alignment. Im going to be doing some more testing this week hopefully I can get it to a 156 with just the one amp and tweeking some more stuff. Have you turned your system on yet?
You know, I've experienced the same situation! With my original box design (which was designed using the wave alignment theory), I was peaking at 50Hz. I decreased the depth and now peaking at 66Hz! I don't know my max SPL at these frequencies, but I do know that I can peg a Radio Shack hand held meter! Woohoo! Anyway, you would think that the original design would have peaked closer to the freq that it was designed for. After further investigation, I discovered that my original calculations were 11 inches off...(damn mounting depth) ...now I've found that my car really isn't big enough for a "wave alignment" enclosure". It's 11 inches too short! I'll give you a call this week and maybe we can play around with it before it's debut at the HiFi Buys show in Morrow.
-------------------- Cory Rainge Team Art of Noyze 1990 Honda Civic Hatchback aka Lil Hell (...literally...NO AC!) Slap DB Stk 1-160 Champion Posts: 25 | From: Ellenwood, GA | Registered: Apr 2002
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quote:Originally posted by Trouble: Wow, 154 with 1 amp so far, congratulations so far Ben. Looks like that will beat our 141.7 from Friday night. You should have brought the truck just to beat the guy with the 4 L7 15s talkin all the smack with his 153. Good luck to you this season.
Hey man thanks. the meter Im testing on reads right along with calvins meter hes used so far this year. So you know thats , a lil high, but Im happy with the results so far this early in testing. I plan on competing at the Hi-Fi buys show in morrow. that will be my first competition with it.
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Just digging up this topic again in an effort to see how ppl are finding the different theories in relation to the new metres?
From my basic understanding the new metres strictly easure pressururization of the air in the cabin while the old metres measured pressurization and rarefication of the air in the cabin. How are ppl finding the new metres have been affecting their scores in regards to this? Is either the ABCD method or the Res Freq method working better than the other? Or maybe a combo of both?
Just curious...
-------------------- I'm so happy, Cuz today I found my friends, They're in my head. Posts: 130 | From: Melbourne, Australia | Registered: Jun 2002
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