@cdtd You do need to completely disconnect the woofer before testing. The battery will tell you if the coil is good, If it pops/moves, you really should still check it with an ohm meter...... I’ve never been inside of this speaker, but I’ve been in many. I don’t know this, but just by appearances, looking at pictures, this driver appears to be an Usher 8945 woofer. I don’t know for sure, but if you need to replace, start looking there.
Driver Testing - reduced output
I have Proac 3.8’s. The right speaker has limited output compared to the left speaker. I tested the cables, amps and other electronics as well as swapping out. I get the same results. I tested the tweeter, mid and woofer drivers with a battery and all but the mid “pop” / produce noise. When I tested the mid with the battery, the woofer driver produced the “pop” but not the mid. Testing the woofer only made the woofer “pop”. Question: is the mid Driver bad or is the crossover doing something that is nulling the mid drivers response to the battery test? The wire is soldered to the drivers, i did not remove the solder before testing. Thanks in advance!