Critic's Corner

Posted by rick_m (A) on June 05, 2007 at 08:31:33

In Reply to: RE: reflected waves posted by truthseekerprime on June 05, 2007 at 05:18:38

Well, he may be emphatic, but then so are politicians... I still think he's got it backward. Imagine an audiophile's wife getting to the mailbox first and opening the Visa bill. Seeing what his new preamp cost, she trots into the listening room and shoots him.

The pistol causes a rapid increase in the room's air pressure which propagates as a positive wavefront. When it strikes a wall (a high Z), it can't go any further and the pressure builds up at that point which in turn produces a positive wavefront which propagates outward back into the room. It reflects in phase.

In her haste she left the door open so when the positive wavefront going in that direction reaches it, it can escape and most of it does rapidly decreasing the net air pressure and causing a negative wavefront to propagate back into the room. It's a low impedance and reflects out of phase.

The moral is that high impedances reflect in phase, low impedances out of phase and that a new preamp can have hidden costs.


Regards, Rick

• You're correct - see my post above - truthseekerprime 08:59:50 06/05/07 (0)
  In Reply to: RE: reflected waves posted by rick_m on June 05, 2007 at 08:31:33

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