Home Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

RE: In Theory You're Correct, But In Actuality You're Wrong!

> In Theory You're Correct, But In Actuality You're Wrong!

Fair enough. A clear statement of belief/intolerance/ego suppressing a reality you clearly recognise.

> In theory applying the same force to accelerate a loudspeaker's driver in the
> opposite direction will slow down it at the same rate it's accelerated but,
> that only occurs with a theoretically perfect loudspeaker's driver. However a
> perfect driver doesn't exist.

No it applies always (at least on the scales we are considering) and is what your school teacher called Newton's second law.

> I may be incorrect in my terminology but I believe the inability of a
> driver to stop as fast as it accelerates is sometimes refered to as a
> driver ringing!

If it helps you to think in terms of negatives a driver that is slow to stop is just as slow to start.

> Finally like every other type of driver used the plasma drivers must move air
> which mass, but unlike every other type of driver used the plasma drivers have
> no mass inherent to themselves! Thus once a signal has ceased to be applied
> there's no mass that has to return to the driver's neutral state.

The plasma moves air which has mass/inertia. Once the signal ceases the air will continue moving due to its inertia/mass until the energy associated with its motion has been dissipated.

> No other driver I know of can make that same claim. Perhaps the easiest way to
> envision this would be to apply a DC signal to a driver. Every driver would
> either move out or in ---depending on the polarity of the signal. Now once we
> removed that DC signal every one of these drivers ---accept the plasma
> driver--- would need to release the energy it stored when the DC signal was
> applied in order to return back it's neutral state when no signal is applied
> whereas the plasma driver would simply stop. See the difference?

By passing a varying current through air a plasma creates two distinct types of sound source: a nonlinear monopole due to heating/cooling the air and a reasonably linear but weaker dipole from the fast moving charged particles exchanging momentum with the air. When you turn off your DC source of heat the air will contract generating acoustic waves. In fact, if you have applied you DC signal long enough to reach equilibrium you will nothing until you turn it off when you will hear a bang.

In addition, directly modulating a plasma with an audio signal will produce an acoustic output with typically 10s of percent distortion. It is not inherently a good transducer which is why people mess about with Tesla coils, modulation and the like to address the problem.

> Now if you wish to foolishly continue arguing this point go ahead but, you're
> wrong plain & simple.

Everybody here is well aware of your view that you are right and everyone else is wrong regardless but what is interesting is just how far it can extend.



This post is made possible by the generous support of people like you and our sponsors:
  Schiit Audio  


Follow Ups Full Thread
Follow Ups

FAQ

Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.