Thoughts on interconnect vs. speaker cable length.

Thanks Schubert and Iso. To bring specificity to my question, I am indeed asking opinions on IC vs SC lengths for a run between pre and amp of 3-12 feet vs a run between amp and speakers between 6 and 15 feet. I am currently in position to try 8 and 15 ft SCs with 3, 6 and 12 ft ICs. Just looking for opinions and having fun with audio.

Thanks Elizabeth and Almarg. I was aware of the high output impedance of the 3A would beg for shorter ICs. The 4M pair that I was using seemed to diminish dynamics. I must admit that this is my first forum post and the first time that I have been in position to consider and try for myself such options. I for the first time have a dedicated room for my system, so room treatment is another area I am playing with. I think I might just be having to much fun with all this. Mike

Thanks again to all respondees. I also have my equipment rack (sans amp) by my listening chair and am currently running AQ King cobra between sources and pre and pre to amp (6 ft). Am currently using 15 ft Monster Z2 bi-amp cables between Amp and speakers. I intend to explore other speaker cable options. This arrangement proves so far to be superior to the 12ft AQ diamond back and 8 ft kimber kable 8tc combination I was using. IMO the improvement was due to the different ICs. Thoughts on speaker cables?

Thanks all. Given I have ~$3500 invested in the amp and speakers, I believe $300 would be reasonable to spend on the used market.