[Jenn[_2_]]

In article
,
wrote:


I think the bottom line is there's a lot of people out there that have
more money than any sense of what it costs to make things.

Agreed. But I like the sound
of:http://www.needledoctor.com/Clearaud...2&category=347

and

http://www.needledoctor.com/Clearaud...table?sc=2&cat...
y=347

and

http://www.needledoctor.com/Clearaud...table-Package?...
&category=347

and

http://www.needledoctor.com/Rega-P3-...2&category=353

and even

http://www.needledoctor.com/Pro-Ject...n-Mk-III_2?sc=...
tegory=352

for example

Ever skip rope in front of one? Ever have someone in the next
apartment skip rope while you're listening to one? That can be even
worse.

No, I don't usually skip rope while listening to music. If I did, what
would happen?


You need a suspension with springs AND dampers. Springs don't absorb
energy, they simply hold it in suspension for a certain period.
Dampers-"shock absorbers"-convert the resonant energy into, usually,
heat.

You will wind up with a system with a resonant frequency and a "Q",
like a tank circuit. You do know about tank circuits, yes?

The resonance has to be either above or below the area of interest,
say 20 to 20000 Hertz. With some overlap.

The old console builders knew that. Of course, they cheated by
rolling off early on both ends, because any serious bass response
would have invited "ground resonance" and the box would have shook
like an old washing machine with a bowling ball in the drum.

All this aside, you are talking a matter of cents for the springs and
a couple dollars for the dampers. The expensive bits are the bearing-
$10 to $100, $200 tops for missile grade-and the motor, similar
pricing. If you want electronic active motor control you are looking
at twenty to fifty bucks. The Linn Lingo has about $30 in parts at
Digikey onesy hobbyist prices. (Design costs? Any good designer could
have done it in a day, with PCB, for $500.)