Not dialoum, but I remember those Gallos, heard them, found 'em kinda good sounding. They were a bit unconventional, lacking passive crossovers, relying solely on the respective acoustic rolloffs, so no insertion losses there, combined with those planar tweets (cylindrical in shape) lowish impedance, I can sorta see how they may trigger overly sensitive protection circuitry. Highish voltage sensitivity in a band that doesn't demand much power should still be able to be driven with most amps, though. I don't recall any specific recs from Gallo, just didn't dig so deep.
The woofer on those was a dual vc type, so it could be driven in numerous ways to manipulate damping (actively drive one vc, leave the other open for no extra damping, shorted for extreme damping, or with resistors to get something in between those extremes). Pretty flexible for room integration.
Back to mainstream speakers that can be challenging, a good rule of thumb is to always check load characteristics of speakers with multiple woofers. That's a huge group of speakers from most mainstream companies. Multi woofer designs quite often sport low impedances, in bands that actuall DO need copious power. (And even then, most amps can adequately handle them, excepting the headbanger crowd who might genuinely need MOAR!!)
Gotta go dig more holes and patch up our nightmarishly extensive dribbler system. Tis the season for landscaping, oh, yay.
