This paper describes acoustic filter chambers, low-pass, high-pass and band-stop. The characteristics of each type of chamber are discussed, as well as the properties required and the specific methods of solutions for each.

It's a simple discussion about acoustic chambers and ducts, and provides formulas describing their properties. Acoustic chambers that provide high-pass, low-pass and band-stop (notch filter) properties are shown. The paper is written as a laboratory exercise for students of acoustics.

As you do tests, please post your results. I enjoy seeing things quantified. Measurements can serve to reaffirm our expectations, and they can also show special situations that cause exception. So measurements are extremely important, because when they do not match expected results, we can then analyze our data to see if the measurement or conditions are at fault, or if actually we are seeing a new situation or "exception to the rule."

Consider all the capacitors inside an amplifier. The laws of physics are the same in our amps - each RC network has a corresponding phase shift. Most of the caps are fully in the passband because coupling caps and bypass caps are set for 10Hz or some other very low frequency, so their phase shift is negligible in the audio band. But tone controls and equalizers are killers for phase.

BIG HINT:
The Woofer is 4 OHM ( 2 - 8 ohm woffers in parellel)
The mid is 8 OHM

I never presented the "big picture" of the situation. That was an error of ohm-missions on my part. Im a terrible writer.

A Tip for Hobbyist;

All my cross-over parts are mounted on 'screw down' terminal strips to make it easy to re-configure and change parts.

I'd love to see you check this one out, and to post your results. Compared with the rest of your work, this will be incredibly easy. All you need is a debounced switch - something that can give you a "clean break." Then apply about 5 or 10 volts DC to your loudspeaker. You will measure the signal that results.

Set gain on your scope way up there to measure a very small signal. And have its rate set to show about four cycles at 40 or 50 Hz - pretty slow. What we're trying to capture here is the overring at resonance, set up by the tiny amount of energy of the square leading edge of the DC transition. The small components of harmonics in the resonant frequency bandwidth will excite the system, and you will see a tiny overring.

With gain set so high, the initial transient pulse delivered mainly by the tweeter will go way off scale. I'm not interested in this event. What I'm interested in is how much you are able to excite the system at the motor cabinet's resonant frequency. It will be a small and quickly decaying sine wave at the motor cabinet's resonant frequency. In fact, depending on the woofer, it is likely to not be a complete cycle, and only a half cycle or even a partial.

So if you're interested to do this during your measurements, I'd love to see you post your results.