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Configuring a crossover in AUM
In preparation for this quad sound system gig coming up, I'm experimenting with splitting off the lows and keeping them central while sending the mids/tops to my quad panning matrix, as opposed to keeping the signals all intact and 'free moving'.
I've split lows and highs with AUM a lot in the past, but I ran the lows through a bass amp with extra processing and it often came from a different speaker entirely, so I didn't worry about it too much and just set a LPF node at around 550hz and a HPF node at around 550hz on the other channel. I just chose these frees by ear and it sounded fine (spectacular, in fact!).
I have a few specific questions:
Can anyone suggest any precautions that I should take to avoid artificially boosting middle freqs by letting them overlap in the roll off of AUMs filter nodes?
Are there any specific precautions that I should take with regard to phase of the lows, or can I just send it all off to two busses, sum each down to mono, then send those two channels out to 1+2 and 3+4?
Is there any specific frequency range that people would suggest making the split at?
Does anyone have any thoughts or opinions on the methods of spatial sound distribution that I mentioned above?
Thanks,
Oscar
Comments
The split point depends heavily on the type of the speakers . Also the slope of the filters should be at least 12-18 dB/oct . Low split-point keep the subwoofers clean and tight ,but you risk overloading the satellites and may burn their horns/twitters . On 550Hz the subs and the overall sound will sound muddy.
What's your speaker setup? How are they placed ?
Some infos here: https://forum.audiob.us/discussion/12759/creating-a-cross-over-in-aum
I was experimenting with something in the same way at my smartmixing topic. Check the pics @syrupcore...
https://forum.audiob.us/discussion/18600/aum-smartmixing#latest
I use PressIt to split and 3 busses to control the input to each range and had different outputs (which could be routed to external outputs in your situation)
If you're not splitting to different speakers, but simply want to keep lows centered in the stereo image, I'd recommend doing some mid-side filtering and put a HPF on the side-signal.
Easiest way (I think) is to make two channels receiving on a common bus, put a mid/side-balance node in each channel. one at 100% M and the other 100% S. Now put any filter(s) you'd like in them, for example the mentioned HPF in the side-channel.
Personally I love some 3dB boost with the Saturation node on the side-channel, but it's more of a production/mixing trick to bring out some lush stereo width