View Full Version : Need to start creating my boot build soon. Help with MDF Please
Yes, im going to start making the build soon, iv done one before but that was over a year ago now on my old C, and it was only 1 days work so turned out pretty naff but this time its gonna be a lot different, and better I hope.
Now then, James or Martin them RE SE Subs, would I be better of making 2 bxoes and making it look like one (dividing it down the middle) for them subs or would they work just as well in a twin enclosure? do you know how many cubic ft of air they need and how I should port them? (Thank You)
Is it best to use (as I used before) 18mm MDF or would I be OK using 15mm MDF (trying to think of weight here as them subs r gonna weigh a ton lol)
What else do I need for the build, I know I need Wood, Nails, Sealant & Jigsaw Blades...
you 2 are ledgends looking at this post already haha and I believe the subs need 0.14cubic feet of air right?
Jameshs_SRI
10-04-2006, 12:40
go with 18mm MDF and have the subs in the same encloseure. they need around 1.5 cu.ft ported and you want to port them to around 30-40Hz. if you go onto www.talkaudio.com and go in the streetbass section look for a guy called xxx vectra. ask him and he should design you a box as long as you have the dimesions
go with 18mm MDF and have the subs in the same encloseure. they need around 1.5 cu.ft ported and you want to port them to around 30-40Hz. if you go onto www.talkaudio.com (http://www.talkaudio.com) and go in the streetbass section look for a guy called xxx vectra. ask him and he should design you a box as long as you have the dimesionsOuch, port them at 30-40Hz, how do you work out how many Hz your porting them at lol.
Jameshs_SRI
10-04-2006, 12:42
Ouch, port them at 30-40Hz, how do you work out how many Hz your porting them at lol.
speak to XXX vectra you need to use a bit of software to produce you a box
Hi.
i'd personally have two seperate boxes. i wouldnt know whee to start with 2 subs in one box...
ideally you want a ported box. The port is used to tune your box. You want it to be "tuned" to as lower frequency as possible...
the reason for this is because subs can be damaged when trying to play a frequency lower then the box will allow it to.
(NOTE: i said subs can, not subs will :thumbs: )
i'd reckonomend 0.7" mdf to make the box, and then 0.5" MDF to make the false floor or any other bits, just to save weight...
As for what dimensions you need to make the box, you'll have to find some one with a box calculator... try looking on http://www.bcae1.com
tools:
Circular saw
screws- not nails
drill
drill bits
sealent, tiger seal or something
dont forget you'll need some box terminals. the things you wire the sub to on the inside of the box
the subs should come with a diagram showing you how to make the "perfect" box for that sub, follow them and you'll be fine. imo porting a box is a waste of time, two separate sealed boxes will sound better
Jameshs_SRI
10-04-2006, 12:45
the subs should come with a diagram showing you how to make the "perfect" box for that sub, follow them and you'll be fine. imo porting a box is a waste of time, two separate sealed boxes will sound better
why is porting a box a waste of time
have the subs in the same encloseure.
why do you suggest this? it didnt think it made any difference?
im go ing on talk audio now, its gonna be missions to make this lol, i might do it out of cardboard to save fu*kin it up and then use that as a template, good idea?
Oh and I know you all think its better to go not ported but im gonna just for the pure fact iv heard james's with that huge mofo'in port and its good. lol
Jameshs_SRI
10-04-2006, 12:46
why do you suggest this? it didnt think it made any difference?
space will be a problem with 2 ported boxes. also when i was building my box i checked the RE website and they reccomened putting them in the same box
:lol: you port SPL subs. only a nunce would do otherwise
space will be a problem with 2 ported boxes. also when i was building my box i checked the RE website and they reccomened putting them in the same box
thanks :thumbs:
so space is the only real issue? there's no major dB increase?
Jameshs_SRI
10-04-2006, 12:48
:lol: you port SPL subs. only a nunce would do otherwise
:? hope this isn't aimed at me :look:
Jameshs_SRI
10-04-2006, 12:48
thanks :thumbs:
so space is the only real issue? there's no major dB increase?
iirc i think you do gain about 3
just seen someone on talkaudio.co.uk and his amp blew, people are saying it could be to do with him putting the amp on the box and it vibrating causing a dry joint, is it not wise to put the amp on the box?
Thanks again.
oh and it says XXXvectra is permantly banned. lol
iirc i think you do gain about 3
:lol: wasnt aimed at any one, i think its criminal not to port them :P
3? that's loads... i would never have thought that. well, im always learning :thumbs:
3dB is effectively doubling the volume to the human ear...
3dB is effectively doubling the volume to the human ear...
yeah. i thought that 91 db is twice as loud as 89 db :\ (or something like that) maybe its 3db at much lower levels... i dunno? :|
porting makes it very hard to make the box perfectly, and you loose the safety factor of the air buffer in a sealed box, theyre called ENCLOSURES for a reason
porting makes it very hard to make the box perfectly, and you loose the safety factor of the air buffer in a sealed box, theyre called ENCLOSURES for a reasoni see where your coming from, but it aint hard at all if you got circle saw bits that cut a perfect hole, which I indeed have and am going to use.
Can someone answer me, when putting a port in (im gonna buy the ports plastic or metal) do I just drill the hole and screw the ports in or do they need to be in a certain place of the box?
i see where your coming from, but it aint hard at all if you got circle saw bits that cut a perfect hole, which I indeed have and am going to use.
Can someone answer me, when putting a port in (im gonna buy the ports plastic or metal) do I just drill the hole and screw the ports in or do they need to be in a certain place of the box?
EEEEEK.... i shouldve explained...
a port isnt just a tube stuck in a box... it can be a tunnel for the air to move along...
my box has an L shapped port. it looks like a rectangle has been but in the top, but if you open it up, it has a long tunnel in it..
a port is deisgned in conjunction with the box/internal volume to tune it. i cant stress how impoprtant that is. to tune a box you dont just whck in a few holes :thumbs:
Jameshs_SRI
10-04-2006, 14:29
the ports will be MDF slots designed into the box
you really need some one with a box calulator programme IMO...
i see, or take it to an audio specialist and get them to do it, if I was to design it, could I design just the box then get someone else to put the ports in?
I noticed that on yours james, the big hole at the top, have you got any recent pics as I can only find one from PVS 2005 on here and its your old box.
I mean with my Vibe sub & amp its got a neat looking port on it which is just a round metal port and I wanted something similar on the new box (but obviously a few more of them)
thx
do a search in google for a box calculators.. you'll find one eventually- and as you change the figures of the port lengths, diameters, and amount of ports, you will see what a difference it makes to the box.
:)
martin & james have u got pics of ur latest installs, I just want mine to look perfect in the boot of the car, not just a huge great big box that comes up really tall, I want it looking pretty and was hoping to get the subs facing out of the boot but not directly, like laid back etc, am I being too optimistic for the sound im looking for?
Thanks
i've got a pic in my gallery on this site mate. i can post some hand drawn pics of what im on about...
i think havign 2 subs in a corsa boot tuned to a low freq will be very hard to achieve...
but like i say, search for some box calculators and give it a go :thumbs:
another reason why i suggested 1 sub instead of 2 :P
well iv just had a quote to have it all done for me with fiberglass n stuff and its in the region of £500 so im going to look into it a bit more.
fibre glass...?
just look for a box calculator. you type in you sub info, and it tells you EVERYTHING. what size MDF, the thickness, how many ports, how to make the ports, how many screws to use :P
trust me. it will only cost about £50 to make the entire boot yourself. and more fun.
Jameshs_SRI
10-04-2006, 15:37
i think havign 2 subs in a corsa boot tuned to a low freq will be very hard to achieve...
I do :D
you said yours werent ported? sealed boxes are smaller, so 2 sealed would be no problem..
http://corsa-c.co.uk/gallery/files/1/4/9/1/mybox.JPG
thats what i mean when i say my box has an L shapped port...
and yes, i'm not an artist :thumbs:
I do :D
what db is yours at now??
ive got as box being made up now and and the chap is tunign it to below 30htz??
im no wiz but thats low? but he is unsure of the db rate i will get?
what db is yours at now??
ive got as box being made up now and and the chap is tunign it to below 30htz??
im no wiz but thats low? but he is unsure of the db rate i will get?
yes that is low. i have 32Hz and im happy with that...
well i was...
now you've typed that im going tolook into a 29Hz box :P
http://corsa-c.co.uk/gallery/files/1/4/9/1/mybox.JPG
Martin.
In this design, would it still work with the sub mounted in the piece thats at 45 degrees?
If so I might make a couple :D
Ste
the reason i did mine like that was because it fits in the boot behind the seats mate.
you want the "vent" and the sub on the same "wall" if you get me...? so, yeah you COULD have a box that shape, but you'd need to change all the dimensions of the port etc, its not just a simple move around :\
i'm going to find a site i think with a calcualtor on it. Could make me a bit of money :P
iv been lookin there a simple calc on there
bit off topic... have any of you 2 put polyfil in ur boxes?
cheers jim
bit off topic... have any of you 2 put polyfil in ur boxes?
cheers jimpolyfil for what? as a sealent you could use that I guess. Doesnt matter as long as air dont get through, but dont fill your box up with pollyfilla if thats what ya mean lol
Jameshs_SRI
11-04-2006, 10:34
what db is yours at now??
ive got as box being made up now and and the chap is tunign it to below 30htz??
im no wiz but thats low? but he is unsure of the db rate i will get?
i will get it tested when i can be arsed to fit my new amp :lol:
the lower you go the less db that you will achieve unless you give it loads of power
polyfil?
:|
what on earth for...? you can put sponge/cotton wool, in a sealed enclosure.
however, if going sealed; i'd recmoned a layer or two of sound deadening (dynomat etc) on the floor of the box (or what ever wall if facing opposite the woofer)
Jameshs_SRI
11-04-2006, 14:01
does that make it sound better
BarinaSXIpurthOZ
11-04-2006, 15:03
It stops the boot from virbrating.
Martain is that the box u currently have in your car???
Martain? Martin :P
yeah thats my current box... im going to try and get a lower one though... i havent done anything to my car in the past few weeks, so im gettin bored :P
BarinaSXIpurthOZ
11-04-2006, 15:19
sorry mate cant spell for sh1t
BarinaSXIpurthOZ
11-04-2006, 15:20
i want to build a nice lookin setup rather than my box in boot
sorry mate cant spell for sh1t
:lol: its alrite, thought you were takin the p1ss :P
well my build is designed for sound, not looks. just cover everything in black carpet and it looks well smart. simple :thumbs:
BarinaSXIpurthOZ
11-04-2006, 15:25
cant figure out were to stick my amps cuurrently there are both amps and cross over on the back of the passanger seat
BarinaSXIpurthOZ
11-04-2006, 15:26
Likc on MDF screwed into the rear of the seat not dumper on the back seat
i just built a floor acroos the bottom of the boot. mounted the amps and wiring to this.
i then put in some fans.
i then put in some legs, and mounted another floor about 4" above the first one...
on this floor i mounted my sub box.
then i wedged in 2 more bits to make side walls. done. :D
got a pic in my Gallery on this site i think...
you want your amps to be lying flat so they cool properly, and become more effiecnt, making them louder/clearer etc :thumbs:
Alright im gonna try the false floor thing with a couple of computer fans and perspec showing the amps through the floor.
Jameshs_SRI
11-04-2006, 16:28
well my build is designed for sound, not looks. just cover everything in black carpet and it looks well smart. simple :thumbs:
Thats the sprit :thumbs:
i was readin through my manual thingy for my sub n it say's 2 fill the box 50% full of polyfil! was jus wonderin if any of you lot have done this or could it jus be for my perticular sub :dontknow:
i havent put any in mine as of yet. asked bout it at halfords, they showed me a pic n sed it was £12 a square meter on order :lol: jus looks like 10mm thick wadding!
i'm not sure if i should get some or not ? ? ?
polyfil?
what the point making a box to the exact dimensions just to whck a loada polyfilla in it :\
im baffled....
you put cotton wool and stuff in there so it "absorbs" the vibration from the sub. This makes it "stop" quicker at the end of a "beat". it gives a tighter sound...
never heard of polyfil though :P
polyfil?
what the point making a box to the exact dimensions just to whck a loada polyfilla in it :\
im baffled....
you put cotton wool and stuff in there so it "absorbs" the vibration from the sub. This makes it "stop" quicker at the end of a "beat". it gives a tighter sound...
never heard of polyfil though :P
probally jus makin my self look like a rite c*nt but i'm sre it sed polyfil :lol:
i'll have another look 2 make sure!!
tighter sound, sounds gd 2 me!
corsa_bhoy2004
11-04-2006, 19:57
so is cotton wol a goood ting to put in ure box who has done it??
so is cotton wol a goood ting to put in ure box who has done it??
most people with sealed boxes :)
http://corsa-c.co.uk/gallery/files/1/4/9/1/mybox.JPG
thats what i mean when i say my box has an L shapped port...
and yes, i'm not an artist :thumbs:Now how would u get that last bit of wood to stay put as it has nothing to clamp to 1 side
Now how would u get that last bit of wood to stay put as it has nothing to clamp to 1 side
pmsl....
i didnt "draw" that side on- its so you can see inside it :P
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