Transmission line behavior

I think the entire system, turntable, amplifier, and two speakers, cost less than that, even when adjusted for today's prices :) The speaker cable was indistinguishable from thin lighting flex. It worked well enough, except for the pickup from the TV.

Sylvia.

"Fred"

** Really ??

15,625 Hz whistle is clearly audible to most young folk - but hardly an major annoyance.

Unlike an old blowhard like you.

** How absence makes the heart grow fonder and gilds the lily too.

( Wot a wack job ... )

.... Phil

Wonder why the audiophools haven't jumped on mounting the amplifier on the back of the speaker ?:-) ...Jim Thompson

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| James E.Thompson, CTO                            |    mens     |
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      Remember: Once you go over the hill, you pick up speed

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Phil, I know 'jack shit'* about matching to stereo speakers. (Do you insist I remain on topic?)

But I have great fun moving magnetic fields around with air coil inductors**. The above matching network works well if R(cap) =3D R(coil) and RC=3DL/R. This doesn't improve the response time of the coils, but it makes the amp driving them much happier.

I would have guessed something similar for a speaker. George H.

*Yank for "nothing at all"

** the fun part is getting Rb atoms with 'pumped' magnetic moments to interact with the field.

If you have a battery, a source resistance and a switch connected to a transmission line, and the other end of the transmission line has a load (we'll say not the characteristic impedance). At the instant you flip the switch a voltage divider will form with the source resistance and the characteristic impedance of the cable. The voltage will propagate down the line till it reaches the load and then reflect back depending on the mismatch of the cable and the load. The voltage will go back a forth until it stabilizes on the voltage determined by the voltage divider between the load and the source.

Shaun

BTW: no refund necessary, I learned lots!

It's not weird enough for them. :(

--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.

Audio is such nonsense.

John

This was in a cable. They were no wires just strong all over the place.

The problem is, this cable that was being used is designed for 50/60Hz power and the polyx compound used in it has a very high C/Ft between the pairs. Combine that with a tightly spiral twist cable with others didn't help matters at all. It kind of raised questions about constant drain when used in it's intended application. Use enough of it, and you'd need to start employing PF correction banks.

We resolved the problem by using 250' runs of #10 zip cord with the clear poly compound. We do make that there from time to time, Most likely for some sound products. It's low profit wire and only done when the high profit jobs are slow.

The once you move the "switch" it is *NOT* DC, forevermore. Like I said, get a refund.

You may think so, but you *obviously* didn't.

krw - you can split hairs all you want but you accomplish nothing and prove nothing. My explanation is sound.

Shaun

Your "explanation" is at *best* sloppy. The fact is that transmission line effects *don't* matter at DC. Steps or impulses are *NOT* DC.

Turn in your shingle and demand a refund.

A problem with poorly improvised speaker wiring is inductance and capacitance together. Single conductor wires strewn about for long distances don't work well.

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I will not see posts or email from Google because I must filter them as spam

Oops. Meant to say 'inductance'. I ran some calculations on single conductor wire loops before posting then got confused because all the calculators for this showed final impedance (resistance + inductance) for a given frequency:)

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I will not see posts or email from Google because I must filter them as spam

Fuck you and die krw

Anyone you did, probably would.

.

ed it

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for

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Any idea how much? Certainly less than 1,000pF/foot ??

George H.

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"Shaun"

** Hey - you tryin' to steal my thunder ???

... Phil

I expect you're correct here, but your first post -- teens can hear to 22kHz,

60-year-olds can hear to 14 or 15kHz -- strikes me as rather optimisitic. There's a chart here: ... that only goes up to 6kHz, but it clearly demonstrates that your average 60-year-old is not going ot be able to hear 14kHz anymore.

The differences between men and women in that graph is interesting as well... they retain more high frequencies by a significant margin, although lose low frequencies by a small margin.

I could hear 22 KHz when I was 20. At 22K, it was more like a feeling of pressure than an actual pitch. I could walk past a house and hear the 15K from a TV set horizontal sweep, definitely a high-frequency pitch.

John