spl installs

[Coonper]

Originally Posted by liam_b

so aint there much diffrence in the gt4 and 5 then?

i would love to have 4 of them but as seid i would need a new amp or an extra amp with as im getting my geny p 4 next week aint wise for me to speand even more on another amp

You said ou had the 1201.1 JBL amp?

You could run 4 gt4's @ 4 ohms, which would put about 200rms into each sub, which tbh, is enough! Then at a later date, buy another amp, then you can rub 500rms into each sub!!! Then you're gonna be hitting some nice figures!

EDIT : You aint gonna get shit out of that amp streetbass wise! It will only do about 200rms bridged!

Granted it will be great for powering speakers, but not subs!

[liam_b]

Originally Posted by Coonper

EDIT : You aint gonna get shit out of that amp streetbass wise! It will only do about 200rms bridged!

Granted it will be great for powering speakers, but not subs!

witch amp you on about mate the jbl or the geny?

[Coonper]

Originally Posted by liam_b

witch amp you on about mate the jbl or the geny?

What amps have you got?

You said you've got a jbl 1201.1, but now your saying youve got a genesis?

Have you got both??

[liam_b]

ive got jbl 1201.1, but im buying a geny p 4 next week for my front comps

[Coonper]

Ahh right! Got ya!

You looked into FI subs? They do some hard hitting SPL'ers. Also, RE have some reet nice subs!

[liam_b]

Originally Posted by Matty

Righto, heres a design, about the best i could get with your available space. 1.75cuft tuned to 35hz per sub. Should be pretty nice



Build 2x of these boxes, one for each sub. Have the sub & port on the same face, and both facing upwards in the car.

[Coonper]

What sub is that for mate?

[liam_b]

for 2 gt5's

[Coonper]

Originally Posted by liam_b

for 2 gt5's

1.75cuft? Seems a little small... But hey ho, if thats what it says then go with that. I suppose its only got a relatively small driver displacement.

I wreckon you should go with gt4's tbh mate. Theyre proven to give good results nd can be had for silly money!

[liam_b]

welll acording to jbl thats the perfect size for there sub

got both gt5's today £39.99 each then got some 18mm mdf its stuply expensive was £15 for 2ft by 6ft so its going to cost me around £40-50 to make the boxes

[Coonper]

Originally Posted by liam_b

welll acording to jbl thats the perfect size for there sub

got both gt5's today £39.99 each then got some 18mm mdf its stuply expensive was £15 for 2ft by 6ft so its going to cost me around £40-50 to make the boxes

Well thats fair enought then i suppose. JBL know what theyre doing!

MDF is pretty expensive! Especially the thick stuff!

You could have got BFUK to make you a pukka enclosure for about £40each posted.

[liam_b]

well ive found out that BnQ are pretty cheap for 18mm mdf an thay will cut it so im going to go there tomorrow and get them to cut it all up for me so all i gotta do is glue n screw

[Coonper]

I'd be tempted to make it from 25mm (1") MDF! 18mm just wont hold up to the forces and sheer pressure like 25mm will, and you will lose some of the sound due to the flex of the box. Cus for all the flexing of the box you are losing precious DB's!

Also, you would be best to make it double skinned with sound proofing in between the layers. This adds to the strength of the box even more and creates a vacuum between the wood giving more output and more rigidity. The inside of the box also needs to be very well braced and supported. This will also affect the final volume of the box, so it needs to be taken into account when cutting the wood. As you will need to add the displacement of the bracing wood onto the final volume.

Routing a radius on the port to create a flare will help to reduce any port noise and optimise the flow of air.

Another quick tip... Dont use screws to hold the sub in, use nuts and bolts! Just this can give up to a 1db increase in output.

[liam_b]

cant get hold of any 25mm plus the design is for 18mm but thanks for the help mate il let u no how i get on next cuple days

[liam_b]

well went BnQ today for 8'x'4 it was £15.97 it toke about 20 cuts but luckly it was an old mate on the cutter so he put down 5 cuts so both boxes have only cost me £16.62 going to start puting them together tomorrow 1 thing i need to no is have i put it together right? heres a side shot does every thing look right?

[Coonper]

Yes mate! All looks good!

Gonna sound good!

[liam_b]

yeah hope so. 1 more thing is where should i mount the sub? as close to the port as possible, as far away as possible, in the middle or doesnt it matter?

[liam_b]

well got one of the subs done now all sealed up and put in heres cuple pics will have the second one done next cuple days here some pics used about 70 screws in the one box lol

[Coonper]

Looks very good mate!

But more importantly, how does it sound??

[liam_b]

sounds good so far but aint turnt it up yet as there brand new and im gonna run them in a bit