ascl
Head-Fier
- Joined
- Feb 27, 2010
- Posts
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- 17
Is that really true? I don't think that TRS (3-conductor) termination at the driver is necessary for balanced operation. Each cable would have 3 conductors (and 3-conductor termination would be present on the amp side), but 1 conductor (the ground) only acts as the cable's shield. 2 conductors (+ and -) go to each driver, see image below. The ground conductor would not connect to anything on the driver anyway. The (floating) shield could stop at the connector (or in the connector but not connected to a sleeve). So, I think that mono (2 conductor) termination at each driver would be sufficient, unless I'm missing something here (which of course I could be).
(image from headphone.com)
Balanced requires 3 different connections, 2 for audio, one for the ground or shield. The 2 audio connections are out of phase with each other, which allows any interference that was picked up to be removed. If you only have one audio connection, it is an unbalanced connection and you lose the interference protection. So yes, a TRS or other style of plug with 3 connectors (XLR) is required.