Check out the cabkes section of Audio asylum you may find some ideas there.
Originally posted by tubeguy44 the soldering is relatively easy.... pin 2 is hot, pin 3 is negative and pin one is the shield |
Originally posted by afilipi DrSpike69: Studio subwoofers (e.g., Mackie) have XLR balanced in. Ales |
Some systems have an active differential circuit that, for the circuit to work correctly, needs three conductors - Pos, Neg, and Neutral - in addition to the shielding. |
The circuit monitors the Neutral and adjusts the signal based on the feedback |
If the equipment doesn't monitor the signal through some means (i.e. netural), |
how does it know when and how much to adjust the signal strength (up to +/- 6 db)? |
the circuit adjusts the signal output to compensate for the signal loss due to the length of the cable. |
Originally posted by Paul D. K. DrSpike69 - The new Velodyne DD series has XLR's. That's one of the reasons I'm considering buying the DD-15 (my cable run is going to be 60-70 ft) over the B&W ASW 850 (that matches my Nautilus 803 Speakers). Paul |
Originally posted by Paul D. K. techtv1- How does it know how long the cable is? According to B&K - It doesn't know how long the cable is, but it adjusts the signal based on the impedence in the circuit which is in part based on the length of the cable as well as quality of the conductors, etc. Is the load impedance bridging or matching? Matching. Why doesn't any other balanced equipment do this? If the equipment has an active differential circuit - it does. Otherwise, they simply have balanced connectors. B&K said if you have any other questions they would be happy to answer them for you - 1-800-543-5252 - Ask for Gerry or George. |
from http://www.crownaudio.com/pdf/133472.pdf Balanced Line A cable with two conductors surrounded by a shield, in which each conductor is at equal impedance to ground. With respect to ground, the conductors are at equal potential but opposite polarity; the signal flows through both conductors. |
Maybe it's a gimmick |