Can speaker cables be too thick?

Can anyone tell me what the sonic characteristics are when you are using a very thick copper cable (> 4 AWG) compared with cables with higher gauge number? A certain Swiss amplifier manufacturer claims that the thicker the copper cable the better the sound. Sometimes 20-30A travels through the cables during very short periodes (kick drum, tympani) even when the speakers seem to be a benign load throughout because in real life with real music a speaker's impedance can vary a lot.

Chris

http://www.roger-russell.com/wire/wire.htm

This should answe3r your thickness issue w/ regard to overkill. He takes a common sense approach, missing in much of what passes for cable "wisdom" today.

I recently had an odd experience. I am not into the technical aspects of electrical phenomena, so no arguements from me.
I use tube monos and decided on short, 1.5m Cardas Ref cables for my Avalons and Audio Physics. After about 3 weeks, it seemed the music was compressed and muddied. No longer had the soulfulness. My audio group agreed.
I tried my old standbys- DIY monster cable with a Home Depot power cord taped together in biwire configuration. (Absolute Sound did a speaker cable shoot out with low, med, very high $ cables. The Home Depot the lowest $. A Sound concluded that it was tought to HEAR much of a difference between the H Dep. and the most expensive cables.)
My cheap DIY monster cable with a Home Depot cord at 15 feet immediatley put the soul, depth, soundstage, tonal balance back into the room for which the Avalons and Audio P are known for.
I don't know if the Cardas were too short. But they were HUNDREDS of dollars more expensive than the cables I am using and will DIFINITELY remain in my system.
You might want to give this approach a chance. if you agree with my take on the matter, you can use that good money for other things.
Good luck!

I'm sorry, even the Roger-Russel article doesn't provide the answer to the question. Thx anyway for the article.

Chris