We use full range JBL speakers (37Hz-20kHz) but we have also 2 extra JBL subs (37Hz-150Hz). Currently we use a high pass filter set at 150Hz on full range speakers and the rest goes to the subs. How do I utilize the low end of those full range speakers and get flat response in the room?
By utilizing the crossover, the mains can produce the mid and high frequencies much more efficiently, and thus louder and with less distortion. I cannot imagine an application where this would not be preferred. Using the individual eq on each channel on the mixer should achieve the desired result. For PA or speech, for instance, I dial the bass back, and boost the mids and highs.