20 foot long speaker cable: is it ok?


Hi guys I'm looking to move my speakers to the long wall of my room, the 14 foot one. In order to do this I'm going to need to acquire a 20 foot pair of speaker cables. I don't (can't) put my amp in the middle.

Based on my research it seems as long as the cable is well made, it shouldn't matter, at least 20 feet or under? I am worried that my sonics will suffer... 
d2girls
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Is there any way to move the amp closer to the speakers?
I would use longer interconnects between preamp and amp than use long speaker cables. And, balanced interconnects over RCA.
B
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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.