re: X32 Discussion
If I Insert say an exciter on a subgroup and multibussing a channel through that group does the entire board latency compensate and change (increase) so that all routes stay in phase? I have read that without inserts the whole system is phase coherent, wonder if it remains that way when inserts are used?
Hi John,
this is an interessting question and I hope I can answer it with my plain english, as it is a quite complex topic.
Maybe I should start with the not so common fact, that the vast majority of digital live boards (none of the Yamahas or the A&H iLive f.e.) do not have a latency compensation.
I think, only the Digidesign consoles have this feature (correct me, if I'm wrong).
There is a story to both sides. If you are into parallel compression and have fun with any kind of double routing and stuff, you may like latency compensation because you don't need to think about what you are doing. All signals will always be phase coherent. The downside to this is the fact, that you are adding latency to all your signals at the same time. Together with other digital gear in a complete audio rig, it might become hearable at the end. If you just add one GEQ in a (let's say) matrix out in a board with latency compensation, ALL other outputs will face the added latency due to this one GEQ in a matrix out. This is the price you have to pay, if you want phase coherency on the entire console.
Personally, I don't like the idea of latency compensation on a live desk. One example:
On a Yamaha M7CL, the roundtrip time from a analoge input to a direct out is: 1,73 ms (48kHz). If you now set a routing in the M7CL like this:
In(GEQ) – ST(GEQ) – Mtx(GEQ)out
The latency will rise to 2,65 ms. That means, all your monitor outs (feeding InEar systems or floor wedges) would have this amount of latency, if the M7CL would have latency compensation! Let's say you would ad more digital devices like a Line6 wireless mike (I guess they have a latency of about 3ms) and feed your wegdes over a digital speakercontroller (maybe with fir filters) you could end up with an overall latency of about 7 or 8 ms!
To say it straight, the X32 has no latency compensation also. But with the fact in mind, that only the dedicated insert effects on the X32 will rise the latency, you can compensate their latency with the channel delay. The roundtrip time on a X32 is 0,8ms. If you insert one of the eight stereo fx to an audio subgroup or mixbus out, this will add 0,7ms. With this in mind, you should add 0,7ms of channel delay to all these channels you double route to an audiosubgroup where one of these eight FX engines is inserted and all of your signals stay phase coherent. In addition I just want to stress to fact that only these eight stereo effects will add latency, the rest of the desk will always work with 0,8ms latency and is always phase coherent, regardless how much EQ or compression you are usesing.
Long story to a simple question, sorry for that. But I just had a long discussion with on Yamaha PM5D owner, who did not know that his board has no latency compensation too;-)
Christian