Hi Niels, i'm using the same (cheap) DB-25 cable from Reichelt, about 1.5m long. It's also unshielded and you are right, it might pick up some noise, even a ground hum if you run it e.g. close to a transformer. But: my expectation would be that while reducing the DB-25 cable length and upgrading to a better/shorter USB cable (e.g. with a ferrite ring) will help to battle the minor digital noise introduced by the PC, it will probably not he