Here's the missing bit of info:
if the ratio of the pre's output impedance vs. amp's input impedance is marginal, then keep the interconnects SHORT. 2 meters or less is recommended. If you have to have long interconnects, your chances of success are better with a balanced (XLR/XLR) system. Worst case scenario: preamp w/ 500 ohm output impedance driving 20 ft of RCA/RCA cable into an amp w/ 10k ohm input impedance.
Best of luck,
Joe
if the ratio of the pre's output impedance vs. amp's input impedance is marginal, then keep the interconnects SHORT. 2 meters or less is recommended. If you have to have long interconnects, your chances of success are better with a balanced (XLR/XLR) system. Worst case scenario: preamp w/ 500 ohm output impedance driving 20 ft of RCA/RCA cable into an amp w/ 10k ohm input impedance.
Best of luck,
Joe