TED must be related to TLT: http://en.wikipedia.org/wiki/Tired_light_theory
With very long cables, even a few light years long, what happens? -- Marc Le Wed, 27 Jul 2011 17:52:58 +0530, umashankar mantravadi <umasha...@hotmail.com> a écrit : > > havent you heard of tired electron distortion ? (TID). the electrons > in speaker wire get tired moving back and forth and not going > anywhere. the solution is to disconnect the speaker every few hours > connect a battery one side and short the other, so all the old > electrons can be flushed out (i think i read this in the wireless > world) umashankar > > i have published my poems. read (or buy) at > http://stores.lulu.com/umashankar > > From: neil.water...@asti-usa.com > > Date: Wed, 27 Jul 2011 08:20:02 -0400 > > To: sursound@music.vt.edu > > Subject: Re: [Sursound] Distance perception (really speaker wire > > discussion!) > > > > I wrote the following as a guide for internal use at my work-place > > a few years back: > > > > One "don't" that I hold close is this: Don't be mislead by the many > > "snake oil and, smoke and mirrors" cable vendors that seem to imbue > > speaker cables with magical (and astronomically expensive) > > properties. No matter what Monster Cable, Audioquest, or Cardas > > claim (or any other esoteric speaker wire manufacturer for that > > matter), there has never been any proof in any unbiased listen test > > that there is any benefit from using these "snake oil, and smoke > > and mirrors" inventions. [I still stand absolutely by this > > statement... if you are one of the sad souls that believe they can > > hear a difference, then you deserve to waste ALL your money on > > magical items - I have some acoustic candles for sale > they cost > > $1000 each and you must use one per speaker in your listening > > room.... the benefits are "when lit, you can find each speaker when > > you turn the lights off"....). > > > > The most amusing claim is that some speaker wires are > > directional... yes, some manufacturers have decided that their > > cables must be installed in a particular orientation (usually > > indicated by an arrow printed on the outer jacket of the cable > > indicating the direction from the amp to the speaker that the wire > > is "designed" to be used. All sorts of claims are made trying to > > justify this. However speakers are inherently AC (Alternating > > Current) devices, and hence the electrons in a speaker wire spend > > just as much time traveling in one direction, as they do the other, > > so there is no fathomable reasoning that explains just how a > > speaker cable can possibly be directional, well excepting possibly > > being able to charge 10 times more to cover the cost of printing > > the arrows... In fact if you consider this claim further, the more > > you realize the "wacko" aspect to this - if the cable truly did > > work better in one direction versus the other, then the resultant > > sound cannot possibly be an > yt > > hing other than distorted when the electrons are flowing in the > > reverse direction! > > > > Another odd claim heard for some of the astoundingly expensive > > speaker connects on the market* is that 'normal' speaker cables > > exhibit some resonance in the audio band, due to their claimed > > transmission line properties (since it is common to model a cable > > as an RLC network). While the RLC model is not invalid, the > > (usually unsubstantiated) claim that the resonance occurs in the > > audio band (most often mentioned is 1.5kHz), is very easily proven > > through basic electronic math to be hopelessly incorrect, and even > > for a long 50 foot 10AWG cable of quite humble specification, the > > resonant frequency calculates out to be 2.02MHz (some 2 magnitudes > > beyond human hearing)! In reality cables DO NOT resonate at all! > > The model represented here is single RLC lumped circuit for > > simplicity and is only accurate at audio frequencies for circuit > > analysis. A speaker cable is actually a distributed element and > > should be represented as infinite number of lumped RLC models. As > > an infinite number > o > > f lumped RLC circuits are modeled becoming its true distributed > > form factor, we see the resonance frequency go to infinity. > > > > In order to shorten this discussion the most basic don't is, don't > > buy any cable that claims anything other than the simple design > > goal of connecting an amplifier to a speaker. > > > > So what does matter? > > > > The bottom line is that the speaker cable DC resistance should by > > rule -of-thumb present no more than 5% of the impedance load > > presented by the speaker, and hence the ONLY real issue of concern > > is the resistance of the selected wire per foot. The speakers I use > > most often have a rated impedance of 4 Ohms, hence we do not want > > to see a DC resistance greater than 0.2 Ohms for the cable run. > > > > In general the distance run per wire gauge recommendations I use > > are as follows: > > > > Up to 40 feet : 14AWG > > 40-60 feet: 12 AWG > > 60-100 feet: 10 AWG > > > > - Neil > > > > > > > > On Jul 27, 2011, at 8:03 AM, umashankar mantravadi wrote: > > > > > > > > years ago (no decades ago) i found what a huge difference it made > > > if the wires were reasonably thick, and cut to be exactly same > > > length. cutting them to same length is problematic with eight > > > loudspeakers (unless the amp sits in the sweet spot) but my next > > > rig, in my own house, in bangalore next year, will have same > > > length wires to all the speakers. umashankar > > > > > > i have published my poems. read (or buy) at > > > http://stores.lulu.com/umashankar > > >> Date: Tue, 26 Jul 2011 21:57:49 -0700 > > >> From: d...@dgvo.net > > >> To: sursound@music.vt.edu > > >> Subject: Re: [Sursound] Distance perception > > >> > > >> On 26/07/11 3:41 p.m., Sampo Syreeni wrote: > > >>> On 2011-07-26, Fons Adriaensen wrote: > > >>>> I certainly don't want you to waste your money on fancy > > >>>> speaker cables. > > >>> Never thought otherwise. That's obviously never been what we do > > >>> here. ;) > > >>>> But resistance does matter, so a good cross section such as > > >>>> 2.5 mm^2 puts you on the safe side. > > >>> > > >>> What I was trying to ask is, what's the real problem with > > >>> resistance, especially with regard to a passive speaker and a > > >>> modern, A/B class solid state end stage? I mean, I don't really > > >>> see cable resistance shifting their operating point much, even > > >>> with feedback, within the audible range. > > >>> > > >>> What is it that I'm missing? > > >> I swapped out some lamp cable on the speakers of a stereo setup > > >> some years back with some cheap stranded speaker cable I bought > > >> at Costco. Each core of the cable was about 3 times the cross > > >> sectional area of the lamp cord (each core of the speaker cable > > >> was about 3/16" in dia). The distances were not great, 5 or 6 > > >> feet. The improvement in stereo imaging was huge. Previously the > > >> image had wandered around between the speakers seemingly at > > >> random, now it was rock solid at the point wherever it was when > > >> I recorded it. _______________________________________________ > > >> Sursound mailing list Sursound@music.vt.edu > > >> https://mail.music.vt.edu/mailman/listinfo/sursound > > > > > > -------------- next part -------------- > > > An HTML attachment was scrubbed... > > > URL: > > > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20110727/2a25f5c3/attachment.html> > > > _______________________________________________ Sursound mailing > > > list Sursound@music.vt.edu > > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > > > > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: > > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20110727/bbcdd993/attachment.html> > > _______________________________________________ Sursound mailing > > list Sursound@music.vt.edu > > https://mail.music.vt.edu/mailman/listinfo/sursound > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20110727/54bed32c/attachment.html> > _______________________________________________ Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
