Report Trying to identify Sundown sub to order correct recone kit in Sundown Audio - GREAT Amps/Subs! GREAT Customer Service! Posted December 28, 2022 That's a zv4 rev 1 with the OG mega roll surround. Get with DTX ( Directronix) for an up to date recone with mega roll V2. That sub uses a true D2 8 layer coil. I believe there is a high BL coil available as well but those coils are very similar if I'm not mistaken. That's a potent driver with the right soft parts.