It's because we often run subs hotter than tops for live music, I think. For example, if I choose to HPF a vocal at 100 Hz on a full range system crossed @ 100 Hz with the subs 6db hotter than the tops, some of that <=100 Hz will be going through the subs at +6 compared to the >=100hz going through the tops. In response I take my HPF filter and move it up (or on an LS9 - up a lot), losing some of that 99-125 from the tops I was perhaps looking for. On a group/aux-fed system I can let a channel go as low as the tops will go, without encountering +xxdB subs because I simply don't assign it. Despite barely hanging on to the science at hand, I'm still comfortable based on this thread and my experience with saying that when I work on professionally tuned systems I get more consistent behavior in the crossover area by using group-fed subs as opposed to aux-fed subs with varying levels.
Despite barely hanging on to the science at hand, I'm still comfortable based on this thread and my experience with saying that when I work on professionally tuned systems I get more consistent behavior in the crossover area by using group-fed subs as opposed to aux-fed subs with varying levels.
I think I can safely say that most of us folks that use subs on an actual aux send run those channel sends at detent or "unity" for the most part. When doing that, there's no difference in crossover point between using a group bus, aux, or non-aux/bus feed "old school" setup...
Greg, I think the concern of the shifting acoustic crossover point is how the sub's aux master send is set relative to the main fader, and how their relative levels may change during the show, not the individual channel sends.
If you change a sub send for an individual channel, you are shifting the acoustic x-over point for that channel as gain is gain whether you adjust it from a channel aux or an aux master. Granted you're not changing the alignment of the whole system. But a relative shift is occurring. That said, it really doesn't matter if you're getting the sound you desire..
A slightly different slant on this that messed me up a couple of times is that the crossover frequency you choose might need to be lower with group/aux fed subs.
Aux fed subs all the way. Occasionally with bass guitars where the low notes have a lot more energy in the subs than wanted, I'll dial down the sub send from detent. Does it shift the relative acoustic crossover point down? Sure. But who cares? If it sounds good, it is good.
Agreed. I'm high passing my tops at 60Hz.
Same here, L'Ac 60Hz and D&B 70Hz. Works just as well on other brands to except smaller single top setups, but that's a whole other story
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