I am thinking of upgrading my speaker cable. I have a nice Kenwood KV6060 and I recently bought new OFC Shielded Phono Interconnects. I thought I should compliment the setup with new Speaker Cable. I only have old AIWA midi hifi speakers (SX-Z700) and the sound is quite good. Will upgrading the cable give a noticable increase in sound quality? ANY help will be greatly appreciated. Thank you in advance.