Which cable has most impact - IC, Spkr., power?

Is there a consensus yet? Good, I'm not too late.
For me it's speaker cable. The only times I hear a difference that I truly believe is there is when making changes to speaker cables.
With ICs there has never been a noticeable change. I have tried some pretty spicy cables so maybe my sonic taste buds aren't sensitive enough.
Same with power cables. No change. I'm thinking either my equipment does it's own filtering, as any properly designed piece should, or my AC is clean. I know the AC is clean so probably a combination of many factors including a healthy dose of skepticism.

As the thread originator.....I'm still searching for an answer. My brain tells me it should be IC's connected to source components. The old theory that if you don't get the information at the beginning of the chain, everything downstream suffers. Lately I've been changing a lot of cables in and out of my system and my preconceptions (and this theory) are not holding up. What's having the most discernable impact is speaker cables, by a wide margin, followed by IC's (source and amp/pre about equal) with power cables bringing up the rear. Maybe this question is so system dependent that there is no definitive right answer, but it seems to me there should be.

Definitely depends on the compatability of the equipment/cable link and the synergy between all of the equipment and cables. If you cannot establish a synergy between all of the cables, you will be changing cables frequently. Some people decide to change the equipment instead. I would focus on upgrading your speaker cables and build around them. If you build around the interconnects, it can be a lot more expensive to constantly be changing speaker cables. For me, speaker cables made the biggest noticeable change, which I feel also reduces the amount of noticeable change derived from the interconnects and power cables.

IMO, start with the power cable.

Joc3021,

You are making the mistake of attributing properties to ordinary wires. It is the quality of AC power and the choice of components which determine whether a cable will make either a large or negligible difference.

Think about it;
Poorly designed power supply => Power cord makes a difference
Extremely Dirty AC power => Power cord makes a difference
Poorly matched impedances between components => IC's make a difference
Ground Loops due to poor grounding or leaky power supplies => IC's make a difference
Speaker load extremely low impedance and highly reactive => Speaker cable makes a difference
Amplifier Output Impedance extremely high => Speaker cable makes a difference.
Unstable Power Amplifier => Speaker cable makes a difference
Underpowered poorly designed outputs stage of the Preamp => Interconnect cable and length can make a difference
Jittery Digital signal poor jitter handling/rejection => Digital Interconnect and length makes a difference

If you follow the logic you will understand that any cable anywhere in your system can make a difference but it isn't a specific property to the bits of wire but really has much more to do with the setup and components themselves.

So exactly the same cable/power cord/IC can make no difference in one system and a huge difference in another...