gas tank and subby don't wanna be friends

[justincredible]

Hi all, I am new on this site.
I have a duel fuel VP sedan with an aftermarket rear spoiler,(amongst other mods not relevant to this post). You guys are probably laughing at me for even having a subby with a gas tank in my boot. That aside, whats the best way for me to maximise the sound and minimise the rattles from my 12" boxed sub? I have it pointing towards back seat at the moment. The gas tank runs across the back of the seat. I have dynamat all around the boot.
Any suggestions would be appreciated Thanks

 

[acarmody]

Many people have dual fuel cars and subs with no problems. Is your tank rattling because that would be a little scary? Oh and turn the sub around an make it face the rear of the car, most people find that that way sounds better.

 

[VesperZ]

I agree, I had a VT with gas and had no issues. I even had 2 12's and didn't find any unusual rattles. I didn't even have dynamat and it sounded fine too. Like acarmody said turn it to face the boot and you should be fine.

 

[justincredible]

thanks. I'll try turning it round. I just thought it may have reduced the rattles from the garnish and the boot lid, and also driven more sound into the car, if it was facing the seat.
I still haven't properly soundproofed the garnish though. I have noticed ppl using socks, cardboard, foam, expanding foam, silicone, pretty much anything. What do you guys suggest/ what has worked for you?
oh and I don't think the gas tank is vibrating, haven't been able to crank the volume loud enough yet coz of other rattles.
Might put a small person in the boot to find the rattles whilst the boot is closed haha .

 

[VesperZ]

I used foam. Went to Clarks Rubber and bought like a sheet and cut it to size. Worked well for me. I had too much bass it kept blowing the brake light in the rear window. Once I put the foam in, never had that problem again.

 

[a1k3m1]

how good are you with building things? .. maybe you could create a custom box outta some MDF, and fix it somewhere better?

 

[justincredible]

I tried to put foam/sponge behind the garnish today and couldn't put the garnsih back on properly, the threads are too short. I am thinking of getting something to spray on the back and some silicone. will have a look at bunnings.
If i gotta build stuff and still not know if it'll sound any better, i'll just pay someone to do it, and make sure they do a decent job.

 

[mattchew13]

I used foam. Went to Clarks Rubber and bought like a sheet and cut it to size. Worked well for me. I had too much bass it kept blowing the brake light in the rear window. Once I put the foam in, never had that problem again.

Crap how much were you power did you have?

 

[VesperZ]

Crap how much were you power did you have?

To be honest I was only running 600wrms in the boot. Not much at all but it still kept blowing my damn light.