BillFitzmaurice.info

In the beginning, I played around a bit, but not extensively, when I got my tuba/otop set-up going. Looking at my x-over, my tubas top out at 102hz, with the otops coming in at 110hz on my driverack, using the steepest LR slopes. When op checking my two new tubas using a tone generator, I noticed that the volume doesn't seem to really start to drop noticeably until quite a bit higher than 102hz. Like 120 and 130 still seem pretty similar, finally backing down substantially as the freq climbs into the 140-150hz range.
I've never noticed anything sounding off with how I've been running, but am wondering if I should set the subs to start rolling off quite a bit lower. Maybe 90 or even 80hz, to get them out of the otops bottom end.
Thoughts???

Since the Tubas are most sensitive above 100Hz you need to low pass them anywhere from 80 to 90Hz to get a flat summed response with the tops. If you had enough of them the Tubas would have a flat response right on down to 30Hz, but that would take perhaps sixteen of them. Even with four of them though you should see a flatter response into the lows than with two.

Thanks Bill, that makes sense. I will play around with lowering the LP accordingly.