I actually have no idea. Once I’m done tuning them to my room, I’m going to build a rear panel to test them with ports, I suppose it would be easy enough to plug them and get a measurement as a sealed enclosure, too.
no, it doesn't. Part of that is that the 2226 has a strong response past 1000Hz, part of it is that I'm using parametric EQ to soothe the horn response, as well as using shelf eq filters at the crossover points in lieu of named filters. As such, I've been able to tune it to have a somewhat linear phase response and a pretty flat frequency response at 1m
this doesn't include the shelf eq filters that I'm using for the crossover, but here you go:
Filter Settings file
Room EQ V5.30.8
Dated: Apr 6, 2024 10:25:20 AM
Notes:
Equaliser: Generic
R Apr 6
Filter 1: ON PK Fc 109.5 Hz Gain -3.20 dB Q 9.403
Filter 2: ON PK Fc 148.5 Hz Gain 3.20 dB Q 7.420
Filter 3: ON PK Fc 227.0 Hz Gain -9.50 dB Q 4.500
Filter 4: ON PK Fc 652.0 Hz Gain -4.00 dB Q 4.473
Filter 5: ON PK Fc 807.0 Hz Gain -3.00 dB Q 1.362
Filter 6: ON PK Fc 939.0 Hz Gain 4.40 dB Q 7.056
Filter 7: ON PK Fc 1154 Hz Gain 7.40 dB Q 1.002
Filter 8: ON PK Fc 1238 Hz Gain 2.70 dB Q 7.400
Filter 9: ON PK Fc 1920 Hz Gain -14.40 dB Q 1.002
Filter 10: ON PK Fc 2053 Hz Gain 12.00 dB Q 1.891
Filter 11: ON PK Fc 2401 Hz Gain 5.00 dB Q 7.015
Filter 12: ON PK Fc 2724 Hz Gain 1.50 dB Q 7.199
Filter 13: ON PK Fc 3045 Hz Gain 0.70 dB Q 7.380
Filter 14: ON PK Fc 3429 Hz Gain 4.50 dB Q 7.403
Filter 15: ON PK Fc 3918 Hz Gain 9.90 dB Q 2.317
Filter 16: ON PK Fc 6513 Hz Gain -2.90 dB Q 1.022
Filter 17: ON PK Fc 9291 Hz Gain -3.00 dB Q 1.046
Filter 18: ON PK Fc 16495 Hz Gain -2.70 dB Q 2.890
Filter 19: ON None
Filter 20: ON None
Filter 1: ON None
I'm crossing at 400 Hz and 5kHz, so filters 4-18 are irrelevant for the woofer. since the JBL extends past 1000Hz, driver overlap has made getting a linear phase response challenging, but I've gotten it pretty close. also, my eq settings are more to tame the horn peaks and nulls of the LaScala bass bin than to manage the woofer itself. YMMV with a direct radiator or other application.
Are the 12 dB LF suppression by the shelf filters enough in order to be used as highpass for the tweeter and midrange ?
Regards
Charles
Regards
Charles
They work best with the natural roll-off of the driver. In some instances, I’ve added a -6db butterworth filter a further up from the low pass shelf filter to help it along, or played with the q of the shelf eq to help it along.
The 2447, 1'5, coherent wave phase plug ending at the exit works well with the JBL waveguides too.
As the 245x drivers do.
SL or Be diaphragms.