bad vibrations from mdf install

[plymouthpolo]

i have recently made a boot install for sub etc from mdf but am having some really bad vibration problems. atm it is just screwed together thru hand-made blocks (literally inch long srips to fill the gap!!) but have found i cant turn up the bass. would silicone sealant of the bathroom variety be of any use in stopping the vibrations?? cheers

[pgarner]

what thickness of MDF did you use? do the "blocks" run the whole frame or just in places? has the box been stuffed with sound deadining ?

[plymouthpolo]

6mm and no only under the screws,, and no sits straight on the metal,, trying to find rolls of sticky foam to rest it on but cant find any.

[lutonmatt]

6mm you need to double that

dyno matt inside the box after sealent anything will do that i used to use what ever was laying around

but never used anything less then 10mm

and how many subs you running from it and how big is the box

[plymouthpolo]

is a single sub inlayed into the spare wheel, 2 6x9's either side at an angle. amplifier is at a slant across back.. will try and get some pics up if i can figue out how,

not so much as a box as a liner but has been ported so airflow not hampered.. looked at figuring out the volume of the box etc but got a bit lost on it and is semi temporary till i can source some fibreglass.

as its 6 mm could i batton it to give it extra rigidity as its only a 1.4 n would prob struggle with the weight rofl!

[lutonmatt]

6mm will move to much thats why you cant go under 10mm

but having it in a spare wheel wont give its volume

unless you bring it up out of the well but still has to have a box all round or you might as well just put the speaker in the boot on top of the carpet

best thing to do is buy a box that is aready made
unless you want to do a big ice set up

and remember your spare wheel have to carry that some where
am sure the traffic cops can do you for not having a spare

[pgarner]

spare wheel isnt required, but if you have one it is supposed to be legal - although it is a grey area.

as matt has said really you need to be looking at using 12mm.

even if you use fiberglass you need to make a strong frame to begin withso there is little movement before you enclose it in MDF/GRP

[plymouthpolo]

was keeping the spare wheel,, murphys law etc. i'm in the stages of a minor boot install but polo + sub + amp + kid / shopping doesnt work well,, the main idea is to optimise bootspace, hence sinking the the sub into the floor, angling the amp / 6*9's. will do some pics on the morro when can get some light on the issue.

will also measure up volume but quick measurements would make it approx 245 000 cc ( 100 cm * 70 cm * 35 cm)

[pikey motorsports]

you CAN run a sub in a wheel well quite effectively, its all aout matching the enclosure size to the sub ( JL 10W0 tend to work quite well) but i wouldnt just be using mdf.

Cover the entire wheel well in silver foil tape, then three layers of fibreglass ( matting and resin ) once cured remove from wheel well and add your mdf baffle, personally i use 18mm mdf. attach in place and seal using whatever sealant you can ( tigerseal/sikaflex is best).

Job done