These were popular around 1972-1976 or so. I have never heard them. I remember them as being advertised as the theatre amplifiers used for the sub-sonics in the movie "Earthquake"
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BGW is still around today folks! You can find them at:
I can't vouche for their new amps, but back in the day (70's) their amps were quite durable and reliable. As for their sonic attributes, well, I would think that maybe they were better suited to bass drivers. You can find these on ebay sometimes.