Jan, Calculating maximum cable length is a complex task and is never accurate. There really is no brick wall in analog--it is just how much degradation is acceptable--but digital is another story and it has brick walls. Two parameters affect analog signal transmission in voltage audio systems: (a) The capacitive reactance of the cable creates a voltage divider with the source impedance of the microphone, creating high-frequency roll-off (b) The capacitive loading of the cable may be beyond the current drive capability of the source's output driver. This creates high frequency distortions as well as roll-off. With normal professional balanced audio connections and voltage distribution, especially if the driver source impedance is around 60 ohms, driving 100 m or more of typical cable is easily possible. Higher impedance circuits, and especially unbalanced ones, should be kept short -- typically in the neighbourhood of 3 m or less. Phono cartridge connections and Nakamichi cassette machine unbalanced outputs are especially sensitive to cable loading. For some additional insight into cable effects and a definition of voltage audio distribution, please see my paper on the subject: http://richardhess.com/be/aes-80.htm You might be better off leaving the A-D converters in the control room and running digital signals to the computers (AES/EBU either on 110 ohm twisted pair or 75 ohm coax). If I were re-building my transfer suite, I would consider MADI and local converters for each machine. While it is more expensive than wires and patchbays, the price differential is narrowing. Cheers, Richard At 03:17 PM 2010-01-17, Jan Myren wrote: >Here is a question I use to discuss with many of my friends: > >What is the maximum length to an audio cable before there will be a loss in >sound quality? > >This may for instance concern in situations where the sound card and the >hard disc is placed somewhat away from the turnable set-up, so that there is >a need for a long audio cable between the output from the phono pre-amp and >the input to the sound card. > >Do you have any good ideas? Richard L. Hess email: [log in to unmask] Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX Detailed contact information: http://www.richardhess.com/tape/contact.htm Quality tape transfers -- even from hard-to-play tapes.