Originally Posted by Tom899
I'm thinking maybe I should only use one sub output on the AVR and split the signal to both inputs of the MiniDSP, and then use outputs 1,2,3 on the MiniDSP.
(I'm currently using SubEQ HT (not split before the MiniDSP) but questioning if I should just split one AVR sub output as explained above)
My understanding of SubEQ HT is that it adjusts level and distance (delay) individually for each (of up to two) subs. The MiniDSP also allows delay and level adjustment but is not automated. So it all depends if you actually want to bother adjusting the levels and delays individually or if you prefer to blindly trust Audyssey. (I have no personal preference on the matter -- this is mainly a trade-off between hassle, confidence and taste).
If you want to use SubEQ HT's capabilities, you *must* use the two AVR outputs independently. If you use only one output and split it, as far as the AVR is concerned, you only use a single sub. Centralizing all delay and level settings to the MiniDSP, while not an automated option, might be conceptually appealing too. Technically, one could obtain the same results this way, too.
The midbass module makes things challenging for me to wrap my head around for best configuration and setup. Currently I set the frequency knob on the regular subs so they cut off above 50Hz and leave the MBM-12 set open (50-150Hz). My subs are all in front with the MBM-12 in the center. My (6) main speakers are set to small with crossover either 120 or 150Hz.
I am not familiar with the MBM-12, but it's basically another crossover in the system. I guess the MBM-12 is daisy-chained to the subs? Is it only hooked to one of the two subs? If so, as far as the AVR is concerned, they are bundled into the sub subsystem. As far as the MiniDSP is concerned, if the MBM-12 is daisy-chained to a sub, it sees the MBM-12 as part of the sub it is connected to. However, you mention using the MiniDSP as a splitter to connect the MBM-12, which is another possibility. If you do so, just take care not to combine multiple crossovers (e.g. the one on the MBM-12 itself and the one on the MiniDSP). If you combine multiple crossover, the slope increases in the frequency response and this could cause a dip in overall response.
So if you use the MiniDSP as a splitter to connect the MBM-12, you should either use the MBM-12's HPF knob (if any), or the MiniDSP crossover block, but not the two simultaneously.