On Sat, 2009-08-15 at 14:04 -0500, Brent Busby wrote: It's fine. All pro audio balanced connections are low impedance outs to high impedance ins. This is done so that you can mult outputs (make copies) and the inputs won't mind a lower dB input signal. Rich... > Is it wrong to use a regular cable (no transformer) to connect the XLR > main and submix group outputs of a console to the TRS (balanced) inputs > of an audio card, or should impedance matching be done in that case? > It is quite common in music stores these days to find cables that are > XLR male on one end and TRS male on the other. (I'm currently using > those on my mixer outputs.) The cables *are* balanced, but they do not > contain a transformer at all. > > The impedance of my console's main/submix outputs is rated as less than > 75 ohms, but the input impedance of my audio card is 10k ohm. This > would seem to almost answer the question by itself, it weren't for the > near impossibility of actually finding a matching transformer that's TRS > and not TS on its 1/4" end. I looked at a lot of them. They're all > made for hooking up guitars, amps, and mics, and they all seem to have > an unbalanced plug opposite from the XLR end. > > If there is indeed a need transformers on each XLR mixer output in this > instance, where can I get one that won't unbalance the connection in the > process? Or is it fine to just use these common XLR->TRS cables that > don't have any? The reason I started to investigate this is because I'm > not sure I'm not getting some of the "tone suck" you might associate > with a badly matched connection, and this seems a likely cause. > > > Addendum: On the realtime end of things, I'm now achievable a solid, > unbreakable 2ms. I can't seem to do anything that causes an xrun. > That's good at least! > _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
