Biggest Improvement Speaker Cable Or Interconnects

I am also a firm believer that "what has been lost at the beginning cannot be recovered" so work from the source downwards...

Based on experience with my own cables in customer environments, the IC's make the biggest difference, followed by the speaker cables. However, this really depends on the IC's. My IC's have extremely low capacitance (3.8 pF/foot), so they make a huge difference. It is fairly easy to make a good-performing speaker cable, but more difficult to make a good-performing IC. Many manufacturers therefore have better speaker cables than IC's, even at the same price levels and so they probably will make a bigger difference.

I think it depends on the current state of your system. If you're already completely outfitted, I would say wherever your cabling is the most compromised, whether that be interconnect or speaker cables. If your speaker cables are overly restricting the music, then spending a lot on a digital IC might not yield the results you hope for, if any at all. In that case changing speaker cables could make the biggest difference.

If you have no cables at all, have a single matching brand throughout, or have different brands of cables but at a similar performance level throughout, then I would agree with what the previous posts mention about getting the best cable starting form the source first.

I'll add something that might confuse you even more. The biggest improvement I've ever gained by changing cables was with a power cord upgrade. Sorry. Good luck!

All of the people I have spoken to re: this subject have told me that the "Cable Company" recommended upgrading speaker cable first.

Definately a good start is to buy the best you can afford from your source to the preamp and match the quality from preamp to amp.. From here.. I believe that speaker cables will have different sonic effects depending on your speakers and amps..
The idea is to have as little resistance between the source to the speakers... If you are using powerful amps or monoblocks... definately a power source upgrade and power cables will let you get all out of your amps.. or at least what you paid for.. Good luck.