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.
it's about 8.5 cubic feet.Hi Gigantic - what's the total back chamber volume in your vented LS style horn?
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 1mThanks - - -and it doesn't seem in the graph to lose any upper bass either
this doesn't include the shelf eq filters that I'm using for the crossover, but here you go:post your EQ settings would be nice
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.great thanks a lot!
If you cross at 800Hz then filter 7 to 18 are irrelevant for the 2226?
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.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
The 2447, 1'5, coherent wave phase plug ending at the exit works well with the JBL waveguides too.A 2-way with 2380 horn and 2447 drivers or perhaps more modern 1.5" exit and waveguide.