2 WORKING 10 WOOFERS 1 IS GENUINE ACOUSTIC RESEARCH. HE SAID YOU COULD TELL BY THE FRAME. THEY BOTH HAVE NEW LARGER DUST CAPS INSTALLED. THE ORIGINAL AR DRIVER MESURES 8 OHMS, THE OTHER 7 OHMS. THE AR DRIVER HAS A LARGE SQUARE MAGNET, AND HAS A SERIAL # TAG: 20000 4 2. IF YOU JUST WANT ONLY ONE, LET ME KNOW WHICH ONE.