PDA

View Full Version : Need some help from the smart guys please....



SPOOLEDCRXB18
01-05-2010, 03:20 AM
Ok so heres the scoops. Get 2 Type ARRRR 10's that tryin to build a box for. Goal was for 3cubes net after all disp. tuned to 30hz. Well my ingenius self built the box and didnt take into account the freekin trunk opening!! Sooo I have to build 2 smaller boxes to make it work. This is the best design i could come up with.. its just a tad under 1.5 after disp. again tuned at 30, subs firing to the side and port back. My biggest concern is the distance between the basket and the port wall. Its marginally less than the port width. Car is a 95 Accord, powering em with zx1000.1 @ 2ohms(2subs) max dimensions are 33wX19dX16h but again have to be broken into two boxes to fit. So 16.5wX19dX16h outside dimensions per box.

Any critique or better ideas would be appreciated..thanks

http://img.photobucket.com/albums/v381/spooledcrxb18/accordsingle10boxdesign2.jpg

SPOOLEDCRXB18
01-05-2010, 01:19 PM
Anybody care to lend a hand???

PV Audio
01-05-2010, 01:42 PM
It is mathematically impossible for that enclosure to be 1.5 cubic feet net.

basscort2009
01-05-2010, 01:45 PM
as long as you have 3 inches or more the magnt will breath fine

SPOOLEDCRXB18
01-05-2010, 06:19 PM
It is mathematically impossible for that enclosure to be 1.5 cubic feet net.

Care to explain? By my calculations i have this:
15" x 17.5" x 14.5" = 2.2 net before disp. Port is 1.75" x 14.5" x 46.25 = .68 and sub is .05. 2.2 - .73=1.47 cubes net...did I screw something up??
(Not being a smart *** BTW)

Basscort, thats problem im rnning into, i have less than an inch from the end of the driver to the port wall... I cannot move it to the other side of the port due to space limitations..

thanks for replies

azimuth
01-05-2010, 11:01 PM
30hz tuning will sound okay, but type R's don't like low tunings all that much. i thought mine sounded better at 35 than 32, going against the "lower tuning sounds better" rule.

SicAudio
01-05-2010, 11:08 PM
you will destroy the sub if it cannot vent at the pole it will cook

and u need to use inside dimensions not outside to get internal volume there sport ;)
you have 17.5 x 15 x 13.75 internal so at best 1.35cf net

azimuth
01-05-2010, 11:10 PM
you might be able to get 1.5 @ 35 hz, and be around the same external dimension.

SPOOLEDCRXB18
01-05-2010, 11:13 PM
if my external dimensions are 16.5 x 19 x 16 wouldnt that make my internal 15 x 17.5 x 14.5??? or am i missing something?

thank you for the info on the venting for the pole...thats what i didnt know and didnt want to find out the hard way.

Im obviously doing something wrong in my calculations if you guys are all coming up with something different than me..lol

azimuth
01-05-2010, 11:19 PM
2.2 before port disp.

x2o
01-05-2010, 11:20 PM
if my external dimensions are 16.5 x 19 x 16 wouldnt that make my internal 15 x 17.5 x 14.5??? or am i missing something?

thank you for the info on the venting for the pole...thats what i didnt know and didnt want to find out the hard way.

Im obviously doing something wrong in my calculations if you guys are all coming up with something different than me..lol

SicAudio told you what was off with the calculations here:


you will destroy the sub if it cannot vent at the pole it will cook

and u need to use inside dimensions not outside to get internal volume there sport ;)
you have 17.5 x 15 x 13.75 internal so at best 1.35cf net

Can you mount them inverted? ;)

SPOOLEDCRXB18
01-05-2010, 11:21 PM
but thats what im tryin to find out..not doubting him but if its not explained i dont know what im doing wrong... and no I cant invert the subs unfortunately

T3mpest
01-05-2010, 11:22 PM
SicAudio told you what was off with the calculations here:

Invert mount will give you more internal space as well as give the pole room to breathe. Good solution assuming the woofer can fit that way.

x2o
01-05-2010, 11:23 PM
Invert mount will give you more internal space as well as give the pole room to breathe. Good solution assuming the woofer can fit that way.

weird how your quote of me didn't show the part you were referring to :confused: lol, whacky cacom.

And he said why it was wrong OP, he said that you were using the outside dimensions, not accounting for the displacement of the outer walls. You need to use internal dimensions.

x2o
01-05-2010, 11:25 PM
NEVERMIND, your calculations are right.

Sicaudio, his height measurement doesn't account for the top panel since it is not drawn. Therefore you only need to subtract .75 from that figure.

azimuth
01-05-2010, 11:25 PM
his calculations are right. at least before port displacement. knowing the width and lenght of the port is needed.

SPOOLEDCRXB18
01-05-2010, 11:29 PM
but thats what i thought i am using please re-read my post and tell me where im wrong

if 16.5 x 19x 16 is external then wouldnt 1.5" from all sides be 15 x 17.5 x 14.5???
he said my dimensions are 17.5 x 15 x 13.75...thats where im confused

SicAudio
01-05-2010, 11:34 PM
Ok so heres the scoops. Get 2 Type ARRRR 10's that tryin to build a box for. Goal was for 3cubes net after all disp. tuned to 30hz. Well my ingenius self built the box and didnt take into account the freekin trunk opening!! Sooo I have to build 2 smaller boxes to make it work. This is the best design i could come up with.. its just a tad under 1.5 after disp. again tuned at 30, subs firing to the side and port back. My biggest concern is the distance between the basket and the port wall. Its marginally less than the port width. Car is a 95 Accord, powering em with zx1000.1 @ 2ohms(2subs) max dimensions are 33wX19dX16h but again have to be broken into two boxes to fit. So 16.5wX19dX16h outside dimensions per box.

Any critique or better ideas would be appreciated..thanks

http://img.photobucket.com/albums/v381/spooledcrxb18/accordsingle10boxdesign2.jpg

your drawing shows 19x16.5x15.25
that comes to 17.5 x 14.5 x 13.75 ;)

SPOOLEDCRXB18
01-05-2010, 11:35 PM
Sorry the ag is screwing us up, but glad i was right on that...so my port calcs are 1.75 x 14.5 x 46.25 that would give me .68 right???

SPOOLEDCRXB18
01-05-2010, 11:36 PM
your drawing shows 19x16.5x15.25
that comes to 17.5 x 14.5 x 13.75 ;)

i see where the confusion comes in but i did list all my dimensions in my post, i just left the top panel off so you guys could see the port configuration..no worries at least i know im not crazy...lol thanks

SicAudio
01-05-2010, 11:36 PM
you have to account for the wood thickness as well :)

SPOOLEDCRXB18
01-05-2010, 11:39 PM
ok...so now the million dollar question, how do i account for multiple pieces like in the port shown?? thanks again for all the help

SicAudio
01-05-2010, 11:41 PM
measure the remainig un ported area it is much easier :) just divide it into 2 rectangle areas and figure it up that will be ur VB

azimuth
01-05-2010, 11:42 PM
you have 1 cube port disp.

SPOOLEDCRXB18
01-05-2010, 11:52 PM
awesome..much obliged gentleman!!! ill go back and try and figure some stuff out as this box apparently wont work worth a cr@p...i do appreciate all the help. I hope you guys will chime in again for my next mistake..lol

SPOOLEDCRXB18
01-06-2010, 01:35 AM
PART 2!!!!!

Ok so after you guys help I decided to redo and found 30hz just aint gonna happen. So new box is just under 35hz same original dimensions ( 16.5x19x16 ext) but new port is 1.75x14.5x33 and after acounting for all wood and stuff I get a port disp of .87 so this should leave me right where i want @ 1.5 cubes that the sub sees. Please let me know if theres any screw ups in this one. thanks in advance

http://img.photobucket.com/albums/v381/spooledcrxb18/accordsingle10boxdesign2-revised.jpg

SicAudio
01-06-2010, 01:42 AM
looks much better gl i would do 38 but thats a personal prefference of mine really

SPOOLEDCRXB18
01-06-2010, 01:58 AM
thanks man, appreciate you checkin in and helping out

PV Audio
01-09-2010, 06:03 PM
you will destroy the sub if it cannot vent at the pole it will cook

and u need to use inside dimensions not outside to get internal volume there sport ;)
you have 17.5 x 15 x 13.75 internal so at best 1.35cf net
:thumbsup: I was on my way out the door, so at least you cleared it up.

SicAudio
01-09-2010, 06:06 PM
i try :)