Why do digital cables sound different?

Expensive Digital cables sound different because you sit lower in your chair when listening to them. This is because your wallet is empty.

I still think a more interesting question is: Why do AC cables sound so different? or Why do AC cords make such an impact on a systems sound?

The AC cord seems much more mysterious to me because it does not directly carry the audio signal at all in a system.

I posed this question and there were only 6 responses at:

http://forum.audiogon.com/cgi-bin/fr.pl?fcabl&1042221110&openusid&zzTok20000&4&5#Tok20000

KF

here's what you need to do... go to your local wal-mart and purchase you a GOLD-PLATED OPTICAL cable, THAT'S WHERE IT'S AT!!!!! HA HA HA. (believe me, they make 'em)

I want a DAC with a slot for PC133 SDRAM, a 5 1/4 drive bay and an IDE controller. Those features should cost less than $60 retail (motherboards do that and a lot more for $60). I'll drop in 128 megs of RAM from crucial for $35. I'll plug in a 40x Plexwriter for $90 with a $3 IDE cable. Then the DAC can expect 100% accurate data to pour into the buffer at several times the playback speed. All it needs to do is pull out samples every 1/44100th of a second and do its thing with them.

If you think streaming bits from a buffer is somehow inferior to streaming them from an external component... well, uh... good for you, I guess. I hear that buffing bits smoothes them over and takes the harshness off the music, but to each his own.

Seriously, if $300 digital cables make a difference, we need to demand better hardware, plain a simple.

This discussion died off. Why?
I'm in the "I can hear a difference and I don't know why" camp between Coax/RCA terminated cables. Some expensive digital cables sound better than the HAVE Canare, some sound worse. I dunno.