On 07/27/2011 12:41 AM, 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?
power transmission impedance matching.
if you look at the spec sheet of a commercial p.a. amplifier, 9 times
out of 10 you will see twice the power rating for 4 ohm loads than for 8
ohms. usually this means you connect two 8 ohm enclosures in parallel
for an optimum load. but obviously any resistance of the wire will limit
the power you can draw from the amp.
say you're using the really cheap NYM 3G1.5 wire, which has about 14
ohms per km. for a practical speaker line length of 20m, that's 0.3
ohms. i won't make a fool of myself here by giving precise numbers after
a day of mixing and three bottles of beer, but it's easy to see that 0.3
compared to 4 ohms is a significant fraction.
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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