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> 6' X 9's But Where?
kirk46
post 15th February 2012 10:23
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1.7 16v
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QUOTE(kreidlerhansen @ 15th February 2012 00:06) *
Keeping it simple always works. No idea why I've never gone down that route TBH...

HighPass Filter/HPF = how low frequencies your mids and tweeters are limited to.

LowPass/LPF = how high frequencies the sub's limited to.

The fronts may be able to play e.g. 50hz but will likely distort at relatively low volume. Keeping the above 80hz will then increase max volume before the sound breaks up. The same goes for the sub but the other way around. Finding the sweet-spot between fronts and sub allows louder music and better sound. There's more to it than this, but going deeper into this subject is extensive to the point of religion...
Oh, and I meant depth and width of the shelf. Was thinking of the possibility of making the shelf into a box. Even a quite flat design will have a fair amount of volume... But that's just me going nuts and over-thinking/-desisgning everything. Please forgive, lol... I just live this stuff!



ok... il keep that in mind

and laugh.gif


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R.I.P 146 :(

QUOTE(groovylee @ 13th August 2011 08:41) *
(easy naan, the other type of helmet :lol:)

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kirk46
post 16th February 2012 11:51
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1.7 16v
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here are pics of the 146.gif's parcel shelf





look like it will be easy to do with the recess smile.gif

one side for the sub and the other side to attach the amp?

will i get away just using MDF on the sub's side?


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R.I.P 146 :(

QUOTE(groovylee @ 13th August 2011 08:41) *
(easy naan, the other type of helmet :lol:)

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kreidlerhansen
post 16th February 2012 13:02
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Strengthen the lot with MDF. I'd reinforce with fibreglass either side of the shelf after fitting MDF where amp and sub are going. Building an X-frame to fit underneath adds great strength, is a simple design and won't wheigh much.
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kirk46
post 16th February 2012 13:06
Post #44 | Print


1.7 16v
*****

Group: Veteran
Posts: 3,857
Joined: 11th March 2010
Local Time: 18th August 2018 16:58
From: doncaster, south yorkshire
Member No.: 4,885
Driving: 98 146 junior, 03 147 GTA
From: doncaster



QUOTE(kreidlerhansen @ 16th February 2012 13:02) *
Strengthen the lot with MDF. I'd reinforce with fibreglass either side of the shelf after fitting MDF where amp and sub are going. Building an X-frame to fit underneath adds great strength, is a simple design and won't wheigh much.


fibreglass?

hmmmmm


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QUOTE(groovylee @ 13th August 2011 08:41) *
(easy naan, the other type of helmet :lol:)

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kreidlerhansen
post 16th February 2012 15:27
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1.3 8v
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Driving: Alfa 145 1.7L 8V
From: Odense, DK



QUOTE(kirk46 @ 16th February 2012 14:06) *
fibreglass?

hmmmmm


Yup! An X-frame underneath + mdf-ring for the sub and a square piece of mdf for the amp. Two layers of fibreglass, over- and underside. That should make it rigid enough to support the weight and minimise vibration/resonans. It's a very simple structure and shouldn't take more than two days, most of which'll be waiting for the resin to dry/harden.

Just sticking the amp and sub in there will make the shelf collapse over time. The alternative route is fitting a pair of 8" JBL coax and running them through the correct filter to let them play below 100-120hz only. Bass won't be as powerful as with a sub, but it'll be nice and tight.
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