In response to Joppe's topic in the Hi-Fi-Corner...
I've never compared Mogami W2549 directly to a Highline, however it is a very considerable improvement over the standard 'Lavender' cable and the standard DIN 4 to XLR cables for a 300DR.
Yes the W3106 is very similar to W2549; in fact it's basically dual W2549 (same construction and materials and almost the same electrical properties, just slightly thinner). And yes you're right I suggest that cable as it's to connect two phonos to a single DIN plug. The alternative approach is to put a soldered connection in the middle of a 'Y' cable made from W2549. There are three problems with the Y cable solution - firstly the junction causes a step in the impedance, secondly it requires the use of heat-shrink as the insulation and that's not as good as the continuous cross-linked PE of the cable itself, finally the junction is a mechanical weakness.
Yes these cables are suitable for use as an interconnect as well as being good as an external cable for a turntable, this is because it's designed as a microphone cable and so it's designed to carry tiny signals with faithfulness.
The connection I favour for using a twinax cable (i.e. two cores in an overall screen) is two use one of the ores for the signal and the other core for the return. I then connect the screen only at the end that's nearest the earth connection to the system (in this case the pre-amplifier end).
I hope this helps.
All the best