A relatively inexpensive alternative would be to run 10 ga. Romex in a 3 wire configuration (~60$ for 250' @Home Depot). Compared to 2 wire Romex, all the conductors in 3 wire are twisted, and contains two hot wires (black and a red), a neutral (white), and a bare ground. Use just the black for hot, white for neutral, and the bare for ground. The red wire isn't attached to anything, and is snipped off at each end. However, one could experiment with grounding the red wire at the panel, or independent ground, and determine if it acts like a shield drain.
Dedicated line which wire?
Is THHN 10 AWG crap?(the price is great) LAT AC2 is about $700. for 50', JPS ac line is about $900. Anyone know if the sub $50 THHN is a sonic compromise? (would rather spend the extra $650-$850 on recordings or concerts) I've heard that questionable copper purity and the pvc insulation make THHN a poor choice for audio ac .Any other ac line recommendations out there? Anyone know if solid really sounds better than stranded?