Re: DBX Driverack PA question
There are shelving filters. You can set the highest or lowest filter on each output to be shelving, it's an option on the main EQ screen before you go into each filter.
A huge issue I have with the 240/260/PA/PX line is that they do not actually bypass the crossover filters when you scroll them to 'out'. All it does is change the screen to show that it's off, when the crossover filter is still in, just at the extent of the audible range. While the filter may not affect the magnitude response much, it still causes a MESS to the phase response because the filter cannot be bypassed. So if you intend to bypass the crossover, because maybe you're connecting that particular band to a powered speaker or something, then change the crossover to the lowest order filter present, the 6dB Butterworth.
Yes, I've measured this to confirm.