[DML] Re: sound system upgrading

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

As a trained engineer I am always concerned about weight. I have a lot
of experience with cars, boats, airplanes, and helicopters. Weight is
ALWAYS a top concern in any design. In almost any modifacation you
tend to add weight. It is a lot harder to increase the power to allow
for the increased weight. One of the most important determinates is
power-to-weight ratio. It is always cheaper to reduce weight than to
add power. I don't say NOT to use Dynamat, just use it sparingly.
Maybe cut it up into strips and lay it in so it keeps the panels from
vibrating. It reduces the sound by adding mass so it is the least
desirable way to go. Try using spun fiberglass. It is very low density
and reduces sound transmission through the air. It also insulates so
it can help with heating and cooling which Dynamat can't. 20 pounds
here, 30 pounds there and before you know it the car can be
overweight. Look at all the stuff most people stick in the trunk. Many
people tend to forget that weight also affects gas mileage. handling,
alignment, and tire wear. VB would have a hard time trimming out my
helicopter without adding A LOT of ballast to keep the CG within
limits! A car is designed for the "average" driver which is usually
somewhere between 150 and 200 lbs. Of course today's average seems to
be getting bigger! Maybe that's why we are seeing so many Hummers on
the road!
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "Video Bob" <videobob@xxxx> wrote:
> I would have to agree.
> The stuff he is talking about is usually called "Dynamat".
> A big roll of it only weighs about 20 pounds or so.
> 
> Besides, the purpose of this stuff is to dead the sound of vibration.
> If you have ever been at a stop light and have some "homies" pull up
next to 





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