Hi everyone I've been out the loop for quite some time. RECENTLY I grabbed a beast of a sub from a buddy of mine that he had in storage for 7 years. This thing is a beast. It's old but I just know it's a nice treasure. It's an RD audio 18 its huge it looks like the ol' Atomoc apxx same basket same huge stack I know it's the d1 I'm just unsure if it's the HW Or the SHW. How can I know. TIA.