Mogami cable is a great budget choice, this one already sounds much better than the original one. hopes you enjoy!

Which cable you have got?   Quote:  

I have once tried both in a headphone store, the Crossfade is not comfortable for wearing long time (my head is quite big indeed). They sounds worse than the Beats Pro (with both amped). If its direct driven, each have their own signature, though none are of my taste. I better go for the AT-ESW9...

If you wish to have less bass, why did you get the beats solo at the first place. you will be much better off with other cans in terms of sound quality    

You can ask if someone want to sell their original cables if they have their HD650 recabled, just try out ur luck in the forum

Will that introduces noices or crosstalk into the cable?   Quote:  

Choosing a 250ohm seems to be a balanced choice between voltage and details   Quote:  

Heard that the build quality of the X-Can havent improved much accross the generations, yet the price tags differs

The price is a bit scary for an "upgrade" cable.   Quote:  

RSA amps are of great quality and price. If budget allows, the combination of using an RSA protector or SR71B in balanced mode (even false balanced) will open a even wider soundstage.

AlgoRhythm Solo line out balanced to RSA protector or SR71B will be better, though these cans work fine without amp at all.   Quote: