An often overlooked sub is the ID CTX subs. You could stick with ID but go with the CTX 124 (4 ohm) or 128 (8 ohm). I've used them in IB in several convertibles! They were awesome and cheap! In my case, I needed a 4ohm load so I did two of the 8ohm (ctx128)

On Amazon: CTX124 - Image Dynamics 12" 4-Ohm Subwoofer

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