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Questions about RCA MI-9584-A Drivers and MI-9595 Horns

Posted by MikePSD on April 29, 2020 at 04:53:40:

Re-posting here on suggestion from the folks on the normal speaker forum.
I just came into possession of a set of old RCA speakers and am looking for details. These came from an old movie theater, built in 1948 so that might be when they were installed. I bought the theater for a craft distillery but the previous owner had taken out everything years before. He just dropped these off for me when he was cleaning out his storage facility. I understand they were part of a set that included boxes and these are the high range part of the system. All told there are 4 RCA MI-9584-A drivers, 4 RCA MI-9595 horns, and the dual throat adapters to connect it all. It looks to be in good shape (one of the drivers has a crack in the back cover and some of the insulation on the horns is a bit chewed up). What I am looking for are thoughts on the following:
How can I check to see if these are in working order? I don't have any tube amps or specialized equipment other than a multi-meter.
Any recommendations on cleaning these up, especially things not to do!
I am highly unlikely to take on a new hobby without my wife killing me, so these will likely need to find a new home. So, is there value to offering them for sale as a set or as individual components? Ebay has been of little help, not many examples or comparisons to glean info from.
I have lots more pictures if needed. Any help is appreciated. Thanks!