I've been experimenting, using the JBL D2430K driver with the STX825 horn and am beginning to wonder if a 1000 Hz crossover point is too low—especially if I change the slope from 24 dB/oct. Linkwitz-Riley to 12 dB Butterworth. I know it's not too low for the driver, but perhaps it is for that small horn. All I've been able to determine from JBL's published information is that in the STX-825 speaker system a 1.3 kHz crossover point is used, though the slope is not specified.