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I have a 12" guitar speaker that was damaged in shipping (basket is bent out of round) but still plays so it gets connected to anything that might smoke.
I have 8 ohm 100W dummy loads for initial connection; if those don't heat up, I hook up some old KLH model 1000s I originally bought for garage speakers.
I use a pair of BPC-ish Sony 2 way speakers which probably came with a rack system in the early 90's. Enough to hear any major amp faults...and they were free.
I've used 5" drivers that were either fuse connected DC or AC coupled. AC coupling doesn't mean you won't see drifting DC if the cap is large enough. ...in speaker kit cheapo cabinets.