I'm not a tech, but anyway, this is what I think I know about the subject. Phase differences or a weakening of the transients/groove are possible symptoms. If they don't, there will be slight discrepancies in clock pulses which could possibly lead to problems. This is so all A/D's and the recorder receive the "digital downbeat" (as Apogee calls it) at the exact same time. If you are using a digital console for monitoring at this point, it doesn't matter if that cable is the same length, but the A/D's and DAW/recorder should all be the same.
But, they should all be the same length if possible.Ĭertainly if you are using multiple stereo or 8-channel A/D converter boxes while tracking, they should all be fed with equal length cable. In short, no not sure you can hear a difference but others think there is one and it does not hurt anything to just make them the same size and move on.Īll your digital devices will lock to the master clock whether or not the cables are the same length. I have not tested this and honestly if I had time to test everything that I am interested in I would be 80 before I started recording and this would still be last on my list of tests. Since the lowest loads I work with are 4 ohms, it's a moot point :-)Īnd I too have heard this argument and agree that it is worth the time and trouble because you may hear a difference. I would think that could start to get noticable when driving a two ohm load near the limits of an amp. The argument I've read for equal-length speaker cables is due to the increase in resistance over distance (#10 wire = 1 ohm per 1000 ft). PS, re: speaker cable, it's never coiled like an inductor - (more like irregular loops if I do it), but it doesn't seem to make any audible difference. Until then, I am going to start to pay more attention to clock cable length, but more along the lines of using the shortest cable for the 'money' A/D. But wouldn't normal manufacturing tolerances of two 'identical' length cables almost assure that such a situation would happen (without compensating circuitry, at least)?Īs I said, I'm confused. I could see how there might be issues if A/D one was in the middle of the top of a square wave when A/D number two got the leading edge of the same or another square wave. Once the external device starts generating clock, if the first A/D gets the leading edge of square wave #1 while the second A/D gets the leading edge of square wave #7, at exactly the same time, why would it matter? My confusion is based on my understanding of clocking (please pardon any errors or holes in my logic, I'm not a tech): word clock is an analog square wave, right? A continual parade of identical square waves. But if having the same length clock cables will give me audibly better sound, I'll do it.Ī quick Google search said, "light travels 0.3 mm per picosecond" which works out to 300 picoseconds per meter. I like to use the shortest length Canare 75 ohm cables that will reach from my Drawmer M-Clock to the various BNCs involved. As for using 'identical' length clock cables, I'm ready to be convinced.
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