but of course ! umashankar
i have published my poems. read (or buy) at http://stores.lulu.com/umashankar > From: [email protected] > To: [email protected] > Date: Wed, 27 Jul 2011 13:26:47 +0100 > Subject: Re: [Sursound] Distance perception (really speaker wire discussion!) > > Oh dear................. LOL > > April edition was it? LOL > > > 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: [email protected] > > Date: Wed, 27 Jul 2011 08:20:02 -0400 > > To: [email protected] > > 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 b e > 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 nu mb > er > 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: [email protected] > > >> To: [email protected] > > >> 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 > > >> [email protected] > > >> 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 > > > [email protected] > > > 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 > > [email protected] > > 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 > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1390 / Virus Database: 1518/3790 - Release Date: 07/26/11 > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20110727/f67c98a2/attachment.html> > _______________________________________________ > Sursound mailing list > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound -------------- next part -------------- An HTML attachment was scrubbed... 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