5 Attachment(s)
To Zobel or Not to Zobel:
N3134 (4430) crossover schematic says Zobel is retained in the LF circuit in external (biamp) mode. N3135 (4435) crossover drops it, apparently.
I'm running 2235H's full range to fill the notch between 1 kHz LF and 1.1 kHz HF crossover frequencies revealed in initial tests with AM6212 HF crossover. Would adding in the Zobel help the situation?
First RTA plot in "average" mode shows response running full range.
Second is with Zobel in circuit. Apparently, JBL 6260 amp running the 2235's doesn't give a whit about 2235 impedance.
Third is N3134 low filter kicked in. Ooops! Notch City. It MATTERS. We'll have to move one or the other of the crossovers' frequencies to close the gap if we're going to retain N3134 low filter as Guido suggests. Whether 2431 will play lower remains to be determined. JBL don't do it anywhere I've seen.
Last two plots show full range vs with filter at lower resolution. The notch is 12 dB deep. We can't ignore it; it's quite audible when switched in and out.