None other than David A. Wilson agrees with Sean. This is from an article in "the absolute sound" issue 63 jan/feb 1990. I believe that copies are no longer available due to a fire. With that in mind I'm sure (hope) that "the absolute sound" will forgive me for borrowing this excerpt.
"Recommendations
My preference is to run relatively short interconnect lenghts when possible. I know this flies in the face of the conventional wisdom of the last 40 years. Just remember that the old approach of power amps near the speakers hearkens from the days of damping-factor 6, 20 watt amplifiers, and low-capacitance paper-dielectric interconnects. Vacum-tube power amplifiers should never be placed in the strong mechanical vibrational energy fields surrounding loudspeakers. Long speaker cable runs are not as destructive as they may seem. The impedance that exist in the power amp out-put stage/loudspeaker interface network are generally quite low, usually well under 75 ohms, so reactive loses in that interface are usually insignificant. Remember, too, that with the very low power-amp-output impedance common today, as well as the beefy cables generally used, effective damping factor is still quite high."
"Recommendations
My preference is to run relatively short interconnect lenghts when possible. I know this flies in the face of the conventional wisdom of the last 40 years. Just remember that the old approach of power amps near the speakers hearkens from the days of damping-factor 6, 20 watt amplifiers, and low-capacitance paper-dielectric interconnects. Vacum-tube power amplifiers should never be placed in the strong mechanical vibrational energy fields surrounding loudspeakers. Long speaker cable runs are not as destructive as they may seem. The impedance that exist in the power amp out-put stage/loudspeaker interface network are generally quite low, usually well under 75 ohms, so reactive loses in that interface are usually insignificant. Remember, too, that with the very low power-amp-output impedance common today, as well as the beefy cables generally used, effective damping factor is still quite high."