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How are ribbon cables different from a copper track on the PCB? I had this discussion some time ago and basically there was no compelling argument to suggest for the very short distances that the ribbon cables run, that it was any different to a PCB track. Of course it is not silver or ultrapure copper and I am not saying there is not an audible difference if you change or upgrade. At the output power of the AK380 the AWG is unlikely to be an issue either. Also if you saw the AWG of the internal wiring in many high end IEMs, the wire is like the width of a hair.
To be clear, I am not defending AK for this decision or saying it's the best at all. But it isn't going to substantially harm the output either which is why the AK380 still sounds as good as it does. I feel this is one of those Audiophile indulgences that wires have to be thicker and ultrapure etc, when there are other changes in the output design that would make far more significant differences.
Also as mentioned previously, the AK380 with cradle into my high-end system beats the Oppo 105 which has much more attention to circuit isolation, fatter cables, separated components etc.
The differences is that there are
1/ several layers (thickness) on the PcB together with the width of the copper printed it resulted in better conductivity. Not to mention that nowadays it is possible to custom made your PcB with different materials and purity as well....who know what AK have.
2/ PCB was made that way, and then every other components were puzzled up and tuned to match it sound preferences from AK engineers by the usage of measurement Riggs equipments and so on
3/ when tuning, it is well known that manufacturers uses the best possible materials to tune and engineer a products, I don't doubt that they used top quality cables wires for the 2.5 socket instead of ribbon cables. For your interest, they can make the product, so doing some wiring and sourcing some exquisite materials is never out of grasp, it is next door. The differences between SS and Duraluminum or Copper could be from the usage of different materials Capacitors and resistors and so on....just AK doesn't disclose it
4/ after the tuning , engineering and prototype met all the specs, they will have to work on the marketing and decide about the final product outcome
5/ back to back with #2 reason, everything on the PcB was engineered that way, and then what comes after the digital and analogue + amplifier converted into will be the final result. The integrity and purity of this signals shall be kept at the maximum potential and minimum degradation. Therefore, better wires with better purity and sizes will be a huge playing factor. Best yet ? Directly soldered it on the board
6/ even the cables from the plugs to connect between your socket and headphones will effect the sound. Let alone the ribbon cables. The keyword here is "Keeping the purity and integrity" of the Post process signals from every High quality components that were engineered on board
Period. I hope it makes senses