Bob, that x10 multiplier "rule" is not something I put much faith in. To actually calculate the drop in dB for this kind of case you simply apply the voltage divider principle at a specific frequency. For example if at 20 Hz the output impedance (what the up stream impedance looks like to the downstream element through same ground return) is 4,800 ohms, and the input impedance at that same frequency is 22,000 (it could actually be different, these are frequency dependent) you get a basic voltage drop of 22k/(22k+4.8k); if it is 1 volt pre divison we are talking 1 v x 0.82, or in dB a -1.7 dB loss. Audible? probably not a whole lot, but that is using these figures. Personally I would rather not like to incur these losses when spending this kind of bread. I would hope that after spending thousands of after tax dollars my electronics can stay razor flat between 20 Hz and 20 kHz. My speakers and room interact to mess the rest of it up but nothing is perfect, eh?
