- Jan 22, 2008
The summing resistors come from the pan-pot, so the impedance there is variable ftom zero to almost zero, via about 1k; the other side go to a VLZ point (VE summing amp have near-zero impedance), so they are in parallels AC-wise. Since the unrouted channels are actually disconnected from the bus, the actual bus impedance varies between 4.7k (with zero channels routed) to 12-13k divided by the number of routed channels (including FX and group returns).Just curious, how are you calculating that? I would not think the output resistors on the bus drivers are parallel. They each connect to a separate output stage and the bus.
The mix bus use 7.5k resistors, resulting in a lower bus impedance, particularly considering that there are more channels routed to the Mix master than to the groups.