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posted on January 7th, 2004 at 08:28 PM
sub in my bus - which space?
hey guys, just bought a 300watt 8 or 10inch sub to play with in the bus, but when i got it home i got stuck as to where to put it. beneath my rear
seat and butting right up against the seat frame is my watertank, leaving me with no way to put it in the traditional spot. i have come up with 2
other options and would be interested in your opinions.
option one: next to the water tank is an odd shaped box, approx 10"wide, by 13"long by 8"deep. the wheel arch cuts into the shape, but
i was wondering if i could install a box here, using the wheelarch and floor as parts of the box (sealing wooden sides to them and thereby
incorporating them as sides of the box). is htere any major risk of rattle or anything? if i were to do this, i would have to place a port out the
side of the box into the car from beneath the seat. is the port supposed to go from the top or the bottom of the speaker (or doesnt matter) ? and do
i need 2 ports (one to let air in, one to let air + sound out)
option 2: there is a small cupboard shelf that is going to be near useless as my bed gets in the way of the door to it. it is approximately 10"
wide by 25"long by 5" deep. the same questions go for this space concerning porting, but also, will it greatly affect volume if the port
faces rearward, as because of the positioning of the cupboard, this is the most likely direction of the port?
a final question. i am running a sony headunit with 4 x 35w power. the front speakers (6x9 explods) are gunna run off an old 60w amp with equaliser,
and i am thinking of runnign the rear speakers (2 ancient kenwood splits and the sub) off a similar amp, bridging the rear channels for the sub and
adding an electronic widget (cant remember the correct term) to filter out the higher frequencies to the sub. does this sound like a safe setup to you
all? i know there will be no power problems, as the sub has nearly enough power from the headunit on its own, but are there any other potential
problems?
thanks, sorry its such a long post
Ryan
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posted on January 7th, 2004 at 09:50 PM
first of all... you will have to go back to the shop where you bought it from, as you left one behind and the one you picked up was for a beetle. and
i hop eyougot the extra amps and a kick arse alternator and second battery and dual circuit from jaycar...
man in the split i just mounted the twelves behind the rear seat above the motor. one on each side with the amps in the middle. bitchin base. dumph
dumph dumph. oh yeah baby. dumph
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posted on January 8th, 2004 at 01:04 PM
It wont make a huge difference where you put the sub (although audiophiles may tell you different). The important thing is the volume of the box, port
diameter and port length. To the best of myknowledge, it doesnt make a difference which way the port faces, so long as it is not fouled or obscured -
it needs to be clear for air to flow in and out.
You only need one port, so long as it is tuned right (right length / diameter).
I would put it under the rear seat, next to the water tank, although I think it would be easier to make the box fit the space rather than using the
body as part of the box. I doubt you will have any problems if you do though, and it would be a neat install I think. Those panels have a fair bit of
strength to them, and it doesnt sound like its a high power sub, so I dont think you will get any harmonic problems from the panels vibrating.
However, whenever you put a sub in any car, you will almost always get a rattle from somewhere. Its not a problem though - just find the rattle and
fix it
Finally dont expect the sub to be able to run off of the head unit (I know you mentioned you have an amp for it). Definetely use the amp, bridge the
two rear channels and use your low pass crossover to stop the high frequency signals freaking the sub out.
And after that enjoy doof doof to your hearts content
baybuscamperkid
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posted on January 8th, 2004 at 06:12 PM
sweet. where can i find out what diameter/length the port should be?
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posted on January 8th, 2004 at 06:22 PM
if you want an easy route. visit a jaycar outlet and get their catalogue. you can buy ported or seal boxes for your size sub ready made. if you want
to make it you could probably get the info on what size it needs tobe from them. say youre gonna get speaker wire and stuff. and remember a good thing is not to all side parallel to each other. you
are better to have a side offset to help with resonance. as for rattles. i have about half a dozen when i whack up the subs. everything vibrates
including the back of the front seat. . but you dont notice the
vibration from inside... i mounted mine using a 50mm thick sheet of foam between the boxes and the floor in the back. and made sure my speakers and
subs were fixed securely. i used the foam to make sure they didnt vibrate on the steel.
