Newsgroups: sfnet.harrastus.audio+video Subject: Re: Kaapeleista lis�� keskustelua (oli: High-Endist� riitt�� keskustelua) References:<01be877c$7d803040$1c058ec2@tero> <01be8789$12585240$4624d5d4@tero> <7f5sbe$eg3$1@tron.sci.fi> <01be87d4$f3fb45e0$62018ec2@tero> From: Tomi Holger Engdahl Date: 16 Apr 1999 14:01:40 +0300 Message-ID: Organization: Helsinki University of Technology, Finland Lines: 18 X-Newsreader: Gnus v5.3/Emacs 19.34 "TeHo" writes: > >Besides describing the L/C ratio, impedance has little to do with > >analog audio cables. Even the highest frequecy (i.e. 20 kHz) has a > >wavelength of 15,000 meters (9 miles). > > Where did you dig up this figure? Wavelenght for sound at 20k Hz > frequency is quite close to 1.7 cm. I wonder what kind of tweeter > would be the one that has to produce sound that has wavelenght of 15 > km's. Kyll� tuo aallonpituus ilmassa pit�� paikkaan, vaan kaapelissa tuo signaali liikkuu l�hes valonnopeudella (tyypillisesti jotain 0.5-09 kertaa valonnopeus), joten aallonpituudeksi kaapelissa 20 kHz taajuuksille tulee hrlposti toistakymment� kilometria. -- Tomi Engdahl (http://www.iki.fi/then/)