Florin Andrei wrote: > But it might be ok, though, to run high- > amplitude analog signal over lengthy cables. I.e., speaker signal. > At those amplitudes and impedances, there's only a very low risk of > picking up noise. You do not pick up noise but the longer the speaker cables the higher their capacitance and their resistance. There also are other strange distortions happening due to cables. All of this can influence the sound: "Speaker cable needs to have a very low electrical resistance, so it needs to be fairly hefty and made from a pure material, such as oxygen-free copper (OFC). Impure material can introduce nonlinearities (the oxidised copper actually behaves as a semiconductor) that manifest themselves as increased distortion at low signal levels. There are many cables that qualify, including 30A 'cooker' mains cable, but a sensibly priced, heavy-duty speaker cable is easier to use and looks nicer. If the cable resistance is more than a tiny fraction of an Ohm, the amplifier's damping factor is compromised and also the loudspeaker's frequency response can be affected. The reason for this is that a loudspeaker's impedance varies with frequency, but if this impedance is placed in series with a significant fixed cable resistance it acts as a potential divider, and the power delivered to the loudspeaker at different frequencies will be altered slightly." (http://www.soundonsound.com/sos/jan02/articles/faq0102.asp#Anchor-32729) (It might be difficult to convince people who intend to buy expensive golden speaker cables to use Linux and a little bit of digital hardware instead but one could try :-) Cheers, Andreas
