I have used this PA in the 70's. Very rich vocal sound in clubs and venues. The "Manhattans" had this PA for their vocals and used it extensively while touring the US Armed Forces in Germany. All I can say is, if you own one then you have a real piece of history. Conway Twitty, Chad and Jeremey, Momma's and the Pappa's, Jefferson Airplane, The Sandpipers, Petula Clark are just some to name a few that have used these PA's.It was a great touring PA and very road worthy. There are a few still around and price is going up all the time.