Which should cover the distance...XLRs or speaker cables?


Looking for advice on which cable to make the longer run, XLR or speaker cable?  I will be driving Klipschorns sitting about 18 feet apart with sources/preamp located on an adjacent wall about 10 feet from the left speaker, rather than between them.  I have to decide whether to put the monoblock amps close to the speakers with longer line level runs, or close to the preamp with longer speaker cable runs.  The environment has relatively low potential for electromagnetic interference.

Preamp is a Mytek Brooklyn Bridge with 75 ohm output impedance
Amps are Bob Carver 350 monoblocks with 100k ohm input impedance

Amps can be placed adjacent to the speakers, adjacent to the preamps, or anywhere inbetween.  My objective is to have the lowest possible noise floor.
volumizer
As you have balanced interconnects then definitely short speaker cable and longer XLR interconnects. The capacitance of the speaker cable will have a greater effect on sound quality than the effects of having a longer balanced cable.
I run long balanced interconnects to my monoblocks and short speaker cables.
If your equipment supports the 'Balanced Standard- AES 47'. This is the way to go as speaker cable characteristics are minimized.
Bob
I have 5 ft speaker cables and 15 ft XLR from the preamp to amp....works fine.
I also own the Carver 350 Mono block amps. I am using longer XLR interconnects and 6 foot speaker cables.

ozzy