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Old 09-13-2011, 09:33 PM
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Default 4th or 6th order ideas

anyone got suggestions on volume and tuning for a groundpounder street music monster. 2 door tahoe 4 mtx 9500 15's-fs31.9 vas2.47 qms3.78 qes0.79 qts0.655 and two TE40001D eventually stepping up to something around 7-9k ran @.5. thought of a 4th order looking at doing 2 cubes per sub sealed then 24cubes total ported between 45-48hz with 20" port per cube I have built a couple 4th orders but now im wondering if a 6th order will be a good idea for this build but im NO bad ass box designer so im a lil iffy on it i was thinking rear chamber 2.5 per sub with a 4" port per sub tuned @30hz with 24 cubes front chamber 20"sq. port per cube tuned @60hz. Any help is appreciated but I do respect the fact that people make money to do this but unfortunatly I cannot do that at this time. thanks in advance
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Old 09-16-2011, 02:06 AM
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You can guess a 6th order and produce output but theres a high chance its nothing near its potential.
The subs have a low enough FS and workable VAS for a 4th order but it will mostly come down to power applied and vehicle/orientation used.

Ive quite a few designs on the waiting list at the moment but if thats okay you can submit a design request and Id be happy to do the design for you.
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Old 09-16-2011, 02:31 AM
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wow don't tell me this is true: qes0.79 qts0.655 ?
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Old 09-16-2011, 02:38 AM
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Unusual that Qms would be lower but it happens, hmpf.

Good point though, really high Q = large box size. Probably calling a 4th.
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Old 09-16-2011, 06:06 AM
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based on the high qts, definately a 4th order.

8 rear 24 front would be pretty efficient. on higher frequencies. what kind of response are you looking for? also how much power?
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Old 09-16-2011, 12:20 PM
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Thats what i was thinking. I expected the mtx 9515s to a have a bit lower Qts(.49 atleast). I assume that the smaller subs have lower values.
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Old 09-16-2011, 12:59 PM
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Quote:
Originally Posted by Novicaine View Post
Thats what i was thinking. I expected the mtx 9515s to a have a bit lower Qts(.49 atleast). I assume that the smaller subs have lower values.
the motor force is surprisingly weak as well, for being as big and beefy as it is....
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Old 09-16-2011, 01:34 PM
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Quote:
Originally Posted by profundus-sanus View Post
the motor force is surprisingly weak as well, for being as big and beefy as it is....
Thats what i'm getting at. It must be the coil, probly a small guage wire. I find small guage coils produce bad results in even big motors. I have a 9" wide motor rightnow and the first time i built it the Qes was way to high(some guy sold me a lame coil). Well, it could also be from a stiff suspension....

It's just a waste of efficiency to have a Qes that high on a motor that large.

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Old 09-16-2011, 02:53 PM
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looking for a lowend street pounder it would be nice if the low end would start to roll of below 30hz. i think the 2 4k watt mtx amps only [email protected] a peice so reactive power around 4-5k if hes lucky only wiring to 2ohm strapped due to coils prolly do a large single amp in the 8k area @.5 later. as far as the t/s specs they came directly from the web site tech documents. the motor is only 16.25lb but has a 4"flat coil.and it will be a 2door tahoe walled to the b-pilar essentially. so what im hearing here is larger sealed side to get the lows more effecient which in turn will need bigger front chamber ie keep same box ratio? hell just give me a soild suggestion but i do reallllly appreciate any help given.
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