20 foot long speaker cable: is it ok?

mental

my interconnects are Belden 1694A. What are yours?

The type and gauge of the wire is very important  especially 
longer runs I would think at least a 12awg size wire  if not bigger 
quality too has a lot to say about the Final product.
myself use the solid High purity foil Speakrrcables from Verastarr  and  they can handle longer runs with no issues.

Thoughts for 12 foot power cord and ’middle of room’? I use several four meter power cords. I have my stereo equipment stack near me. The amp near the speakers. (MY speakers (Magnepan 20.7 are at narrow end of room. MY listening chair is really in middle of room, equipment rack back and to left, along left wall between me and speakers is the Plasma TV and its stand with ’extra’ CD changers and DVD stuff.
(you might try the amp ’halfway’ to the speakers?) Along the wall?
And my power? from the kitchen 20 ampere outlet, with a pair of 32 ft and 40 ft long 9 gauge AC extensions to Duplex boxes, one set near the amp, one set near the power conditioners.MY equipment rack is actually out, away from the wall,) so I can get behind it easily, close enough I can reach the physical volume knob from my listening position.Directly behind it is my PS Audio P-600 regenerator. And back to the side, behind it and the main rack, my two TTs(I cannot begin to say what a nice convenience the rack away from the wall is. Years of experience I LOVE not having to struggle to get at the wires!)MY other power conditioner is away, past the TV stand (against the wall).
((That could be where you put the amp))
Used to use that conditioner for the amp too. (no longer) So each way was four meters. Now I could. maybe, move it closer.Anyway, I have used a lot of four meter powercords. The nice thing is the ’extra’ meters usually do not cost near as much as the first, for plenty of brands of power cords. Having a longer IC to the amp, and half as long speaker cables.. Would be good too.I opt for long XLR to amp, and short speaker cables.                             
added: PS my interconnects are mostly Kimber KS1016 (RCA) and KS1116 (XLR) with a few Cardas Parsec

mental

Just checked the Siltone web page for those Morpheus interconnects.  The wires apparently are a mix of various precious metals including gold, silver and copper. 
Cost per single interconnect:
.5 meter $675.00
1 meter  $785.00
1.5 meter  $895.00
2.0 meter $1005.00

I'll stick with Blue Jeans Cable and not be quite so satisfied with what I might discern as the difference. BTW: The Belden 1694A cables are RG-6.