I had one years ago, I think it was made by Niles. Worked fine with an NAD amplifier. Back then, though, I was using zip cord for speaker wire, and that was about all the Niles would take,.
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Speaker selector boxes put one more switch between your amp and the speakers. Even when new, that's one more spot to add a bit of resistance to the wire run between the amp and speakers, and time will not help things.
That said, years ago built-in speaker selector switches were standard issue on most amps with few complaints. Whether it is a theoretical issue or one that you can actually hear depends on the quality of your hearing combined with your level of audio nevorsa.
Three or four months ago, I bought the "TC-7220 2-Way Amplifier Speaker Selector Switch Switcher Comparator Crossover Router" on Amazon. Haven't dared use it after re-reading the manual of my vintage (ca 2000) Krell FPB amp which says the amp will likely be damaged if connected to a speaker selector. (Krells, for all their weight and heft, are delicate little flowers in some regards — the FPBs also may not be hooked up to any tube preamps without first being modified by a dealer. Kinda ridiculous.)
Anyway, now I wonder if there are any other high-current power amps too that will melt down or blow up if you run them into a speaker selector box. Not sure I want to find out, at least not the hard way. Now the TC-7220 is sitting sad and neglected on a shelf.
Thanks for starting this discussion, I'll be following it closely for additional wisdom.