I understand that impedance rise isn't always a bad thing. Enclosures are often very efficient when impedance is the highest. The two may or may not be related depending on the install.
Will infinite baffle have more or less rise than a ported enclosure? I have gotten different answers from different experts.
So, what is the best way to fight impedance rise? Some full bridge Brazilian amps have special circuitry to help compensate for rise, but they do not completely eliminate it. I am going to run a Taramps 30k, and don't want to wire it low in order to get the full power out of it.
I know that the stronger a motor is, the more drastic impedance rise will be. That is one of the reasons that neo motors have higher rise.
It was brought to my attention that adding a pole sleeve can reduce impedance rise. I had previously thought that pole sleeves were only used in Sundown Nightshades as shims, because there were many different coil options. What material are pole sleeves like this made out of? Aluminum, copper, steel, or something else? I'm guessing most are aluminum and some are copper. Apparently, pole sleeves reduce rise, but also reduce motor force.
What affect does "supercharging" with neo magnets on the pole piece have on rise? The primary purpose of the magnets is to direct more flux back into the gap, according to DD.
Will a copper shorting ring on the tip of the pole piece affect rise? I have heard that it reduces back-EMF, but am not sure.
A far as damping, I have also heard that the amplifier used affects rise. Is there any more public information about amplifier damping factor?
I'm interested in designing and building a neo motor for a 5" b2 coil, and want to get the maximum I can out of my amp.
Does anyone have interesting information about coils?
Copper is more efficient, but it is heavier than Aluminum. Aluminum can handle more power because it dissipates heat faster, and is lighter by volume. Which would yield higher rise. If I had to guess, I'd say aluminum.
Please share any other information you have about the technicalities of subwoofer motors, rise, and/or amplifiers.