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Keep in mind the JBL 2390 lenses were designed to be used with a baffle behind the lenses, I didn't see anything like that in your pictures.

Cut a piece of plywood that's about 12 inches larger in...

Taking bi-amping or tri-amping to the next level with a DSP with a speaker like the Metregon would let you truly time align the drivers. I have never listened to a Metregon but I'm sure it would...

Look at the DBX 360.

You can down the control software and demo it on your computer or if you have an iPad load the app and take a look it in the virtual mode.

The solder job does not look "factory" as well as a lot of the resistors being upside down.
From the looks of the one end resistor and dark look on the board under them I would guess
the originals...

The JBL 2344 horns are for lack of a better description made of dense plastic. Now there were two slightly different versions, the first version was 90% molded plastic with a metal flange throat...

Now that I look at it again it seems like a two part question, amp input and speaker connection.

It depends on the speaker and how the coils are wound the position of the coils in relation to the magnet assembly. If one coil so to speak is pushing the cone and the other pulling the cone they...

It would still be getting full range signal then.

Are you going to play out with this rig or just jam on it at home.

Big loud bass rigs don't always work real well at some gigs!

I use 10-32 and 1/4-20 allen cap head screws on all my cabinets.

I also use 10-32's to mount my rack equipment with.

Personally I would look at other 12 inch speakers for bass guitar unless you doing a true bi-amped rig and the E120's are the low mid/mid section.

The original DN360's did not come wired with a balanced output, you needed to install the optional output transformer. Also they are pin 3 + on the XLR connections.

Depending on the age the signal...

The TH specs for the 2265H are on page 5 of the link to the PDF page.
I still have that same PDF that I printed out in 2005 and the listed TH specs are the same on that one
as the 2008 dated copy....

I thought you could get the service and schematic info from the discontinued section on the Crown website.

I still use 3600's in my system, only ever had one needing repair and made the day of it...

If you some how hit the tweeter with full range or almost full range pink noise at a high level it could have damage the diaphragm, same goes for the compression driver.

If your using the word...

Do you have proper high pass filter on the low end, if the speakers are unloading/flopping from trying
to reproduce too low of below the cabinet tuning that will make low end sound loose without...

We have a winner!

Maybe P Audio?

Try swapping the drivers between speakers and see if the problem stays with the driver.

See what the DCR measures.
How old are the drivers, the foam may have rotted and is stuck all over the...

With that I'm going to guess there using a single pole filter per band pass, the coil is a low pass on the woofers, and a cap with some resistor padding as a high pass for each the mid and tweeter,...

Was/is the crossover just between the mid and the tweeter as in running the cabinet bi-amped?

With screw terminal connections I'm going to say the cabinets were for install use.

What do they have for crossovers...if any, in them?
What type of input connection is on them?

Is the rectangle cut out area a port with some sort of foam covering it
or a blocked off cut out...

It doesn't leave a hole so to speak.

For example a standard 24 db per octave filter cutoff crossover at 300hz at 450hz the signal is attenuated 12db, at 600hz it is down 24db (one octave) at...

You got a real DSP!!

Have you tried a little steeper high pass cutoff, if your not all ready use a BW "butterworth" filter for the high pass, there flat out to the cutoff frequency.

Have you...

Unless I missed it somewhere in your post are you high pass filtering the woofers?
Find you boxes tuned frequency, the tone sweep method mentioned works perfect.
Set a high pass frequency at of...