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Re: load resistors & shunt components

140.153.25.29

Posted by Mart on June 27, 2001 at 10:43:06

In Reply to: Re: load resistors & shunt components posted by alberto a lopez on June 26, 2001 at 17:16:55:

Maybe I shed a bit more light, or not.

in your Q ringing model, there was an unintentional small inference made. It almost sounds like you were suggesting that the inductance only occurs initally. The ringing occurs because the reactive energy is being exchanged between the capative & inductive factors. However, these frequencies need to be present in order to be excited. This also includes Fourier components in square waves & RFI acquired in the antenea nature of speaker cable.

capacitors are usually directional because the positive side has the outer foil. Since skin effect increases with increasing frequency, this migration occurs in caps as well. Thus HFs move outward easier than inward. Most of these HFs are usually unwanted ultrasonic frequencies. As such, we purposely band the driver by orienting the cap to prohibit RFI from reaching the tweeter with the cap in series & shorting HFs passed midrange drivers with the shuting cap.

directional cabling. Most directional cables are the result of unsymmetric shielding where the acquired noise of the shield is grounded upstream. Placing these cables backwards is like improperly mounting unidiection tires on your car, in that you'd be better off without directional cables. Backwards the noise is prevented form being grounded upstream. Thus, the noise is aded to the signal from then on whereas the design was to make sure the acquired noise is mated with the signal such that the difference in the cable's potential is only the signal.

However, not all directional cables are from shielding. Some have no assymmeetry. I *speculate* that his is due to corrlelating the direction of extrusion with the direction of the positive signal. We know that the human ear is much more atuned to the positive signal than the negative. (That's why you can tell when your speakers are in phase with the source signal.) Thus, one could argue that the microcrack orientation (common with extrusion as dislocations accumulate in the annealing process) could prefer one direction over another.

Hope this helps ...

....just my 2¢

» Mart £ «

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