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MemphisLove.
11-26-2006, 05:34 PM
:crap: ok my friend had a box built for his ranger. it is a wedge style box. i went to this website http://www.the12volt.com/caraudio/boxcalcs.asp#por and typed in everything. the box came out to be .692 cubic feet with a port tuned to 62 hrtz. can someone double check for me.


the demensions according to the sites is

width=30 inches

height 1=7

height 2=4

depth is 12

and the thickness of the wood is .75 inches.



it came out to be .69.... cubic feet. and if thats the case then could that be the reason that my friends sub has already messed up twice inside of the box. i also typed in the port calculations with the box volume of .69 and came out with the port being tuned to 62 herts.

the port measurements were 3.75 diameter and 8 inches long. anyhelp would be nice

traksta15
11-26-2006, 06:01 PM
thats what i got (62-63hz, online calculators vary) Thats way too high!! who built the box for him? was it a shop?

MemphisLove.
11-26-2006, 06:08 PM
yea it was a shop and a memphis m3 is in there.... a 12 too lol

traksta15
11-26-2006, 06:24 PM
62 is danm high.........i'd take it back to the shop. How long has he had it and not taken it back after it sounded like that?

MemphisLove.
11-26-2006, 06:43 PM
lol about a month. he doesnt know any better. and i always figured it was suppose to since it was in a single cab truck. it sounded hollow to it. it was weird but it was loud in the 40-50's hrz so i figured it was ok. but when it came to lower stuff it sounded just weird like the sub was dying trying to produce it. i was curious at how much room the m3 would need over the pice of crap planet audio that was in there before hand. Could that also be the reason the planet audio didnt last long? the box being too small?

Symon_say
11-26-2006, 06:44 PM
I put the info you gave on bassbox pro and i get V=1.093 tuning 49.1hz

phyphoestilic
11-26-2006, 06:46 PM
If it was tuned to 64ish hz it shouldn't even be playing notes at like 35 and below, I'd def. take it back to the shop. I dont think even SPL competitors tune that high.

traksta15
11-26-2006, 06:50 PM
If it was tuned to 64ish hz it shouldn't even be playing notes at like 35 and below, I'd def. take it back to the shop. I dont think even SPL competitors tune that high.


x2, i'd throw it through the shop window w/a not reading "fix this"....lol jp, but def. take it back.

MemphisLove.
11-26-2006, 06:55 PM
yea see i dont know if i put teh measurments in right. Symon said he got 1 but i put in what i got 3 times... im going to try it one more time.

MemphisLove.
11-26-2006, 06:59 PM
i remeasured the box

heigth 2 is 4.25 inches instead of 4 so that increased the volume to .7 but i still didnt get 1 cubic foot. Im pissed. so is that a reason why the planet audio would play for about 2 weeks then after 1/2 volume would cut in and out?

phyphoestilic
11-26-2006, 07:00 PM
Even if its not 1 cubic feet the main concern is the tuning.

MemphisLove.
11-26-2006, 07:07 PM
yea i know. ok so someone lay it down for me. can high tuning and too small of a box destroy a sub. cause if so we are going to take it back to summer sound and make them pay us back for the sub shipping for building a box for a subwoofer they sell and were more than happy to build a "awsome" box for...

Symon_say
11-26-2006, 07:08 PM
i remeasured the box

heigth 2 is 4.25 inches instead of 4 so that increased the volume to .7 but i still didnt get 1 cubic foot. Im pissed. so is that a reason why the planet audio would play for about 2 weeks then after 1/2 volume would cut in and out?

i try a website program and it gave me the vol you mentioned, but those programs have some error cause if you calculate asuming the minimal height that is 4.25 and you multiply 4.25x12x30 = 1530 in3/1728in3 = you get 0.89 ft3. plus ading the triangle you get 30x12x(7-4.25)/2 = 495in3/1728in3 = 0.29 ft3, after displacement of port you get about 1 ft3

Symon_say
11-26-2006, 07:09 PM
yea i know. ok so someone lay it down for me. can high tuning and too small of a box destroy a sub. cause if so we are going to take it back to summer sound and make them pay us back for the sub shipping for building a box for a subwoofer they sell and were more than happy to build a "awsome" box for...


yes, those tunings are use by proffesionals how know what they are doing, but you can change the tuning just changing the port. With a 3.75" x 20" you get about 35 hz

MemphisLove.
11-26-2006, 07:21 PM
i try a website program and it gave me the vol you mentioned, but those programs have some error cause if you calculate asuming the minimal height that is 4.25 and you multiply 4.25x12x30 = 1530 in3/1728in3 = you get 0.89 ft3. plus ading the triangle you get 30x12x(7-4.25)/2 = 495in3/1728in3 = 0.29 ft3, after displacement of port you get about 1 ft3

but dont u have to account for the size of the wood?

Symon_say
11-26-2006, 07:30 PM
my bad, i just re-check my bassbox run, i notice that i was using internal measure instead of external :(, now i get 0.658 cu.ft and 63.27 hz

MemphisLove.
11-26-2006, 08:13 PM
poo