JBL LSR4312SP 12" Linear Spatial Reference Powered Subwoofer
I had a complete 5.1 set, including this sub.  These were the worst monitors I have owned.  They are not accurate at all and the room fixing feature is a gimmick, the software was buggy too.  I had 2 of the monitors die, sent back to JBL under warranty only to have them sent back DOA, didn't realize they were dead because I had them in storage, they went out of warranty.  The worst customer service I have ever had. Glad I sold them and will never buy a JBL product ever again.  Old JBL products are fine, the