Hello Sir
I personally own 26yo JBL S3100s a 2 way asymmetrical horn design with a 15 inch bass driver. They will not thunder you out the room, but give very fast bass response especially for a 15 with 94db efficiency without the horn drawbacks. The ME150HS bass driver is basically a 600 watt basket with a 2235 cone. You will not hear much talk about them as they were designed for the Asian Market even though made in America. Mine have been used with multiple amps throughout ownership, but settled on Warner Imaging ER300s a small manufacturer based in Baltimore around 2000 who knew how to build solid state with "Tube Character". If I decided to give them up I would replace with 4344Mk2
https://www.canuckaudiomart.com/details/649479281-jbl-s3100-minieverest-rare-in-northamerica/