Dalquist Screens.
Don't get me wrong, these things sounded great, but I thought the Magna Planers had a big more high end and a bit sharper. I use to have a band technician come over before my parties and dial in my amps. He would also wash the chassis down to prevent any dust on the tubes making static while playing.
Girls would always say, " I'm not familiar with that area you live in " . I use to tell them, " just roll the car windows down and listen for the music ". My neighbors were glad to see me leave.