Back in the early '71 while I was touring, I bought a Standell MCIIb/SAM30b piggy-back amp. It had a sparkly aquamarine grill cloth on the speaker cab and also on the head. And that entire grill cloth was held onto the cab with velcro tabs. I could quite literally grab the brushed aluminum frame of the grill cloth and pull the whole thing off exposing my two 15" speakers along with the 4 round ports mounted vertically next to the speakers. Was kind of cool to see, but the sparkly aquamarine grill cloth looked classier on it.
So I'm old school, which is actually where this bare speaker stuff came from, but I am not a fan of exposed speakers. Out of all your pictures the only ones I would consider would be the speakers with the metal covers and red background on the speaker mounting board - at least it's a little more cosmetically pleasing while offering some protection.
My first "real" amp was a Plush 1000ps with with the matching tuck and roll cabinet with 3 15 inch speakers.
It also featured the velcro tabs and our blasted lead singer requested that I take off the grill cloth. He then proceeded to poke his finger into the dust cap of the center speaker resulting in damage to that cone.
I still have the amp and speaker and the center cone is still unmatched 35 or 40 years later. Turns out they couldn't replace the chrome looking dust cap.
Leave your speakers protected and mistrust your lead singer if necessary.
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Funny you should show the Plush amps/cabs. There were two full stacks of Plush amps at the music store in Lincoln, NE when I bought my Standel. I remember thinking they were Kustom amps at first because I hadn't seen tuck and roll on any other amps/cabs at that point and then I read the brand as Plush. I tried out both stacks of Plush. I thought maybe something was wrong with the first one because it had two cabs stacked one on top of the other (don't remember if they were 212 cabs or 215) and they looked impressive but the sound was just too low. So I had him plug in the second double stack and it wasn't any better. Come to find out they had all of 100-watts rms, which was more than the Dual Showman I had come in looking for, but they just weren't loud enough to compete with the two Vox Super Beatle amps my guitarist and keys player had.
Was ready to give up for now when the salesman pointed out the smaller (single 215 cab plus head) Standel piggy-back amp. Tried that and almost shook everything off the walls. Gave me a good price and gave me $400 trade-in for my '66 blackface Fender Bassman amp (cost me $449 new in '66) and I walked out with it that afternoon and used it that night. Our keys player also bought a Fender Rhodes stage piano (Piano only without the amp you usually see attached to it), and the owner had to come to Little Bo's that night to see who the band was that dropped $2000 in his shop that afternoon. In today's money that's the same as casually coming into the shop and dropping $13,482. Salesman definitely made a nice commission off of our purchases.
That Plush gear really had a nice look though. Glad to hear you still have yours. If you're interested in trying to find a replacement or a repair, check with @agedhorse. He has a pretty good handle on available parts/pieces and substitutions on that era of speakers. Wish I still had my Standel, but it was stolen in 1976 along with my '65 Jazz.