Well - If we assume that 70' of cable doesn't make any difference than cable itself doesn't make any difference and Home Depot lamp cord as good as Stealth Indra and thousands of dollars saved. Do you really believe that - if you do then why are you posting on the CABLE forum?
Super fine things that differentiate hi-end from mass market hifi-ish products are happening at the level of about -80dB (1 part in 10000) and in case of imaging perhaps even finer. At this point we don't event understand physics behind perfect sound like we don't understand why silver cable sound different (on average) than copper one.
With 75' cable capacitance has probably very little effect because of low source/load impedance but inductance in series does. 4.4 ohm of additional (inductive)impedance at 20kHz (1 Ohm at 4kHz) in series with the tweeter will cause big change. We can discuss if 7.5' vs 6' make audible difference but not 75'.
Sombody posted once that XLR cables can be run at any distance without signal degradation - how about a mile?
People get serious.
Super fine things that differentiate hi-end from mass market hifi-ish products are happening at the level of about -80dB (1 part in 10000) and in case of imaging perhaps even finer. At this point we don't event understand physics behind perfect sound like we don't understand why silver cable sound different (on average) than copper one.
With 75' cable capacitance has probably very little effect because of low source/load impedance but inductance in series does. 4.4 ohm of additional (inductive)impedance at 20kHz (1 Ohm at 4kHz) in series with the tweeter will cause big change. We can discuss if 7.5' vs 6' make audible difference but not 75'.
Sombody posted once that XLR cables can be run at any distance without signal degradation - how about a mile?
People get serious.