Wall Outlet Oyaide, Furutek, Wattgate, and others

Nice!, Very good post gentleman, I enjoy learning from both of you Dave and AL, cheers.

Hello Al ... thanks for your enlightenment and how do you get your posts up so quick ... mine seem to take forever ..

I couldn’t agree more with both your posts about a point of diminishing returns and how going to far can be detrimental ... also at certain levels things can be insignificant and irrelevant

I seemed to have gotten off course when I received a poke in the eye with a sharp stick over my comment

The most important thing in your power delivery system is “low series resistance

It appears you support this point with your comment

In a local (in-house) power distribution system, however, impedance at 60 Hz will be dominated by resistance. Inductance and capacitance will become more significant at the frequencies of the much higher frequency components of the AC waveform

I never meant to imply that L and C were irrelevant ... only that R was more of a concern when looking at all 3 ... the reason being is rising series resistance would also increase Impedance

And, yes, resistance in series will add to impedance.

And the last piece of the puzzle is high or low Impedance ...

In answer to your last question, the impedance of the power delivery system should be low,

The enemy of my enemy is my friend ... Sun Tzu ... doesn’t inductance act as a low pass filter allowing low frequencies to pass while presenting a rising Impedance to frequencies as they rise ... I think that’s what you are saying

at least at frequencies up to and somewhat beyond the frequency components corresponding to the brief high current spikes that have been mentioned. (Series impedance that is high at frequencies greater than that may be helpful in reducing noise, but I would not expect an outlet to play much of a role in that regard).

OK so the outlet may not play a significant role in reducing RF.. but isn’t the Inductance of the cabling our friend in helping defeat some RF ?

My comments' are much more theory based to try and understand which direction things move in and their possible effects where as you’ve run the numbers and can speak from a practical stand point of the value of those numbers ... but it seems we agree

Increase series resistance will raise impedance and we would prefer to have a deliver system with a low Impedance

Now I would like to share some incite with you ....

If you want to teach your grandchildren about taxes ... eat 30 percent of their Ice Cream (;-

Best Dave

Hi Dave,

Yes, I think we are pretty much in agreement at this point. Apologies if some of my comments came across as a poke in the eye; that certainly wasn't my intent.

I would emphasize that since the contribution to impedance that is caused by inductance ("inductive reactance," which is measured in ohms) is directly proportional to frequency, and increased inductance in the power wiring may therefore be helpful to some degree with respect to reduction of high frequency noise, that potential benefit may trade off against the ability of the power wiring to quickly respond to abrupt changes in demand for current. Such as the brief high current spikes we have referred to, which as I indicated may contain significant frequency components up to tens of kHz, or perhaps even more in some circumstances.

I would expect that concern to generally be greatest in the case of power amplifiers or integrated amplifiers whose output stages operate in Class AB or Class D, for which AC current demand fluctuates widely with the dynamics of the music.

Regarding the first question in your last post, I can't provide a knowledgeable answer.

Good one re taxes :-)

Best regards,
-- Al

Hey, If this thread becomes TOO "reasonable" I'll have to stop following it. How about some good old fashioned vitriol, recrimination and name calling? Are we becoming genteel in our old age?

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