No, cables aren't worth it. It would be better to discuss why in the Sound Science forum.
Suffice it to say that there's no evidence to support real audible differences, and a fair amount to refute them.
Oh really now.
Which cables have you heard again?
You're making a false assumption. You are assuming that a difference exists.
Quod erat demonstratum.
No one has ever demonstrated a difference that I am aware of. So go ahead and demonstrate a difference then we can move on to evaluating your assumption.
Though I'm curious, how do you change the frequency response without actually changin the frequency response? Cables don't change the frequency response, after all. The same signal comes out the other end. If it is the same signal, then how does it make a headphone develop a different response? After all, headphones (well, most of them) are a coil of wire and a magnet.
If a cable produces a certain effect with a coil and magnet, then how could it possibly produce the same result (allegedly) with transducers that work on entirely different electrical theories? I mean an electrostat is completely different from a dynamic; it works kind of like a capacitor. If a cable does something magical with a motor (which is pretty much what a dynamic is) then how does the same result come from a capacitor? Or a balanced armature, planar or AMT? They're all really, really different technologies. How could the magic effect be produced across everything?
That stinks of an imagined difference.
When you get away from the "I hear a difference" claims, nothing adds up with cables. Whenever you take the cable assumptions a step further you end up in impossibilities and nonsense. They sound plausible, like Bigfoot, but the more you look the less you'll find.
For example, a lightbulb will give off slightly different colors depending on the power it is fed. Alright, hook up a magical cable to power a lightbulb as well as an ordinary cable. Take a picture of each and then use Photoshop to see if there is a color difference. There won't be.
I can hear it now. "You're not using an audiophile grade lightbulb." "Your eyes suck." (Admittedly, I'm nearsighted and astigmatic; fortunately my hearing has held up.) "Your camera is cheap and not good enough." "You HATE lightbulbs!" And so on.
But whatever way you slice it, no matter the angle you approach it from, you end up with a whole lot of nothing. Though you will collect plenty of slings, arrows and accusations.
Oddly, the loudest voices and fiercest waving of hands is from those who sell cables.
Imagine that.
Oh, and yes, I have tried cables. I had a Silver Dragon and a Cardas for Sennheisers for a few years. No difference. They measured the same as the stock cables. They were nicely made and looked good, though. I think they were more durable than the stock cables, too. I eventually sold them.
Currently I run a silver Van Den Hul somethingorother between my tonearm and phonostage. It works. It doesn't measure differently from other cables. It came with the arm and works, so I leave it there. Maybe someday I'll build a replacement and sell it.