This has been interesting. Lots to think about. Justin On 7 April 2018 at 01:27, Bob Blick wrote: > Hi Justin, > > The capacitance of speaker cables, if considered by itself, doesn't reall= y > attenuate the high frequencies. The output impedance of your typical > amplifier is quite low due to it basically being a powerful opamp, and it > will maintain its output under almost any load. In the amplifier there's = a > small inductor in series but it's typically only about 1 uH. Since all > cable also has inductance, together with the capacitance the cable will > have a characteristic impedance. But at audio frequencies it's all pretty > much not going to have much effect. With widely spaced conductors the > inductance potentially could attenuate the high frequencies. In practice, > using speaker cable, the inductance is quite low. > > But if one or both of the conductors is vibrating due to electromagnetism= , > there are going to be (frictional) losses at low and middle frequencies a= nd > that is the effect I was curious about. > > Friendly regards, > > Bob > > ________________________________________ > From: piclist-bounces@mit.edu on behalf of > Justin Richards > Sent: Friday, April 6, 2018 8:10 AM > To: Microcontroller discussion list - Public. > Subject: Re: [EE] impedance of unsecured parallel wires > > Mike, > > I assumed the closer the cables the more capacitance which would attenuat= e > the higher frequencies more. > > To clarify, are you saying closer together is better for audio performanc= e > as it gives more coupling which is better as it lowers the inductance. > > Whereas cables spread apart gives less coupling and increases the inducti= ve > reactance which would attenuate the upper audio freq range more. > > > Justin > > > > > > On 6 April 2018 at 16:09, Mike wrote: > > > On 05/04/2018 23:57, Bob Blick wrote: > > > A very long time ago I needed to wire some loudspeakers and used two > > strands of some salvaged single conductor insulated solid wire, fairly > > heavy gauge. When I later replaced it with regular speaker cable of > similar > > gauge, the system sounded better. I wonder now if the wires vibrated > enough > > because of the electromagnetic effect that it caused resonances. My ear= s > > were pretty good back then. > > > > > > Perhaps I should do some testing and see if I can measure the effect. > > > > > > Bob > > > > > > > The closer the pair of wires, the better the coupling and the lower the > > inductance. If your speaker cable was e.g. 3 meters long (~10ft) then > > they could be adding around 1 Ohm inductive reactance at the upper end > > of the audio frequency range, if the wires were spaced apart. > > > > Mike > > -- > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .