I have a Dahlquist PDQ 1500. It's been running every day for more than 10 years. I have a Velodyne CHT10. It has worked every day for 19 years, never let me down. I had a Kenwood SW300, 12" sub, worked fine until I cranked it with the Dreamworks version of HG Wells' The Time Machine. Blew little pieces of rubber all over the room. A spectacular demise actually though followed by a sad degrading series of farting noises.
These EP subs, just seem to expire frequently and without drama. What are the chances of an EP600 outliving its warranty? Someone must have run the numbers.
Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.