605 time delay crossover

[Alien_Shore]

Do have Fluke 87 DMM?

Not the fluke, but I do have a good DMM - Extech 22

We need the woofer to be a flat impedance from 400 Hz to 4000 Hz.
Add a Zobel to your woofer . This is a series R & C across the woofer . Pick the values that give a flat Z curve. Use an L Pad to find the proper R (10 ?).The C ( 30 uF ? ) can be several caps in parallel

I have not yet built a test enclosure for this speaker, so I assume that you are speaking about all free-air values.
I installed DATS on my desktop PC; it is much more modern than my laptop, so I was thinking I might get more accurate results. Here is the free air test result on the woofer:

Make a CD of the test signal on my web site. and have it repeat 10x or more
To get the delay time we need to play the test CD , with the woofer on, and look at the acoustic signal 12 inches on axis with a scope and almost any omni microphone. Connect the HF horn in series with a 4uFd cap.
This gives you a bare foot woofer and a single pole HF high pass crossover.
Sync the scope with the amplifier output and turn the HF on and off.
Note the LF peak and the HF peak. Estimate the time between the peaks (300 to 500 micro seconds )

OK, I can use DATS for my 'scope. I have a calibrated condenser mic that I've been using to make FR measurements. I'll start now on the zobel and take a few measurements and report back.

Thanks for the help, Don.