I have looked at all the cables now and i think i will go for the 20$ pyst cables if it isn't any big difference, $100 for cables is a bit to mutch...
then i will ether go for the pyst usb cable or this ...http://www.mimic-cables.com/collections/sleeved-cables/products/custom-usb-cable.
Then i have all i need right ?
anyways thanks for your help
There is so much audio hype-ology around cables.
FWIR, as long as the DAC is receiving the red light from an Optical cable and can tell when said light is ON/off, that's all it needs. Over a long range, the energy (brightness) of an optical cable could be so weak that the DAC can't quite tell if it's on or off... but I haven't had to thread a cable that long. Optical only transmits on/off digital bits, so it either works or it doesn't.
USB is similar to optical, except it's slightly easier to pick up interference and get small errors, in normal usage there ought to be no difference in cables (besides aesthetic look).
Analogue cables like RCA connectors may actually have some truth to quality difference. They're like the power line that runs to your house, except the strength of the electric pulse determines how much your headphone driver vibrates, the analogue pulse moves the driver this fast, that far. An amp is like a transformer or power relay, boosting the power and allowing you to control the output, with really high input impedance to try and widen the gap between the music signal and random noise/hiss. Copper is a great electrical conductor, second only to Silver on the periodic table and more flexible and much cheaper, as long as there isn't any corrosion/rust from oxygen in it the signal will pass through. As long as a cable is insulated from external energy (coiled copper can act as an antenna or magnet), not bent/kinked (outer edge of bend becomes weak, possibly resulting in a poor conductive connection and eventually might break), and has a firm connection between plug and jack, the cable will carry great sound.
You need every piece of a sound system (some parts may be integrated with others), but the order of how much a component upgrade will affect the overall sound quality is headphone>digital file quality (Kbps, effects processing and such)>amp>DAC>cables/interconnects. All that is subject to diminishing returns as you go up in price, and all of it could be messed up if one piece is garbage/broken. For me, all my components are in the same room, and cables would be the LAST thing I'd upgrade since I think I've already hit the point of diminishing returns with my RadioShack RCA cables that don't have any defects or kinks. Someday I might upgrade my RCA cable, mostly just because the cheap plastic housing looks weird connected to my Schiit Bifrost Uber and Class-A SET tube amp, but since I couldn't hear a difference between a monster cable and these the upgrade is very low-priority.
Edited by Evshrug - 5/20/14 at 12:34pm