I did have it in anouther vehicle, it had a poor battery and was on a 50-60amp tube fuse and would blow easily so the a,mp sat more than it was used, I could bearly listen to it with that setup. I was hoping once I got a newer vehicle that had some decent power and barrery, did the big 3 and what not it would work fine but its the exact opposite. Have it running x2 lvl 3 dc`s 4 ohm voicecoils. When I purchased the subs I was told to wire to the wiring option #1 in the link
http://www.rockfordfosgate.com/rftech/woofer_wizard.asp?submitted=true&woofer_qty=2&woofer_imp=4