not related to rocco's

[vince@performancecarstereo.com (Vince Royer)]

Don't take it personally Rhett, but I'm not really prepared to give you
fiberglassing advice if you aren't willing to gain a bit of knowledge about
stereos in general before you start.

Vince


-----Original Message-----
From: Rhett Farnum [mailto:chevytrucker@hotmail.com]
Sent: November 19, 2002 1:30 PM
To: vince@performancecarstereo.com; scirocco-l@scirocco.org
Subject: RE: not related to rocco's



I am not really looking for stereo advice, more for the suggestions on
glassing. I have glassed flat things before. I'm just looking for any easier
molding ideas or connections for supplies.
Thanks for the suggestions though,
Rhett

>From: "Vince Royer"
>To: "Rhett Farnum" ,
>Subject: RE: not related to rocco's
>Date: Mon, 18 Nov 2002 12:37:42 -0800
>
>Sounds like a really bad idea. 1st of all, you shouldn't combine 10" subs
>with 12" subs, or any subs with any other. The only time you have different
>size speakers playing together is if you're sending them entirely different
>signals. You send higher frequencies to smaller speakers, and lower
>frequencies to the big speakers. If you're going to split the system up,
>first decide how many ways you're going to go. a 2 way system is like a
>woofer & tweeter, Or a pair of Woofers and Tweeters (matching pair). a 3
>way system would be a Subwoofer, a midrange/midbass driver, and a tweeter.
>A 4 way system would be a Subwoofer, a midbass driver, a midrange driver,
>and a tweeter. It goes on and on, but any more than 4 ways is totally
>overkill and will cause more sound problems than it will solve. Always set
>up the system as simply as possible for the application. If there are
>problems (like low midbass response) then you can address those problems.
>Don't just make things complicated for the sake of it.
>
>Note Above when I say 'Subwoofer', that can be anything from a single 12"
>sub to 20 10" subs to a Bose Triple bandpass 4" sub. The important thing is
>that they will all recieve the same group of frequencies (below 80-100 Hz).
>So the problem with your 10"s and 12"s is that they are both subwoofers,
and
>both designed to play these 'sub-bass' frequencies. By combining them and
>playing the same frequencies through them, you will create cancellation.
>Think about waves in the ocean for a minute. If 2 peaks from 2 waves crash
>into each other, they will make a huge wave of their combined height,
right?
>If 2 dips from 2 waves crash into each other, it'll create a really big
dip.
>What if a peak collides with a dip? Then what? Calm water. No wave.
>Silence. Get it? When the bass hits, your 10" subs will recreate a certain
>wave, somewhat like the one that was recorded onto the cd. Your 12" sub
>will also create a certain wave like the one on the CD, but not EXACTLY. It
>will be different than the one that's coming out of the 10" subs. So the
>waves will collide in weird places in the car and create flat spots, places
>where there is no bass. This will happen pretty much randomly and will be
>worse in some cases then others. The point is: Pick your subs. 10" or 12"
>1, 2, or 20. It doesn't matter. Just make them all the same.
>
>The second thing about your idea is the fiberglass and bondo stuff. Don't
>mess with it unless someone shows you how. It's just not worth the trouble.
>You'll end up with a gross product that probably won't work or look very
>good. If you really want to get your hands into it, just build a box for
>your 2 10" subs. You can't go too wrong that way.
>
>
>-----Original Message-----
>From: scirocco-l-admin@scirocco.org
[mailto:scirocco-l-admin@scirocco.org]On
>Behalf Of Rhett Farnum
>Sent: Monday, November 18, 2002 11:36 AM
>To: scirocco-l@scirocco.org
>Subject: not related to rocco's
>
>
>
>I am planning on adding sub tubs to my 92 cutlass on the panel behind the
>back seat in the support bracing there. Planning on 2-10" and a single 12"
>since there are 3 openings there. I am going to make the tubs myself since
>they need to be custom.
>Me really ? is any suggetions on what to use for molding or glassing
>technique? Also and connections for places I can get gel-coat? I am
planning
>on using expanding foam and bondo for the mold.
>
>Peace,
>Rocco_crossing
>
>
>
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