Hi Ivica,
Can you post some measurements?
Below is a link to some solid Jbl data on directivity of the Jbl 4331 system and the 2307.
See a fig 4 , figure 12.
As you can see the vertical polar reduces to 45 degrees above 5000 hz then falls away.
The impact of this is the height of the horn/lens assembly must be exactly at ear height much like your head in a vice situation. Just something to be aware of.
I don’t mind sitting still in my favorite chair listening to an album with a glass of Knobs Creek Bourbon if it sounds good....Lol (the good stuff)
The whole EQ of a room and power response thing was the intent of the bi radial approach in studio situation with the document below.
I won’t elaborate on that because it’s a big topic. But it can invite challenges in the diy space like CD equalisation and room curves and it goes on and on.
Depending on your own preferences and scenario this may be relevant.
http://www.cieri.net/Documenti/JBL/D...)%20(1983).pdf
Below is the raw driver response (top) and the EQ with the schematic posted in the link previously.
The raw driver is 110 dB at 1 kH and 105dB at 10 kH.
The equalization gives 100 dB at 1 kH and 10 kH.
The lower curve is flattened and extended a bit and the crossover slope.
That’s the difference between just trying it casually and setting up the driver to perform its best. You of course need something to do reliable measurement with.
Again my acquplas dusted diaphragm being a tad more mass may not extend as much as the factory 2425 Ti diaphragm.
You may be able to do this with your drive rack