Adrian, welcome to the club. I think the Rockford Fosgate? sub you intended to replace the stock Infinity one with needs way more power than your stock amp can send it. 250 RMS will barely work on that Hyundai JBL amp that is designed to send maybe 60-90 Watts to the sub. I would either get a separate 250/500 W rated Mono amp to power the new sub or ditch the sub and look for a stock replacement to swap in.
I know this because added the 8" sub from an older Tib (like yours) into my 2008 which didn't have one by wiring a Mono sub inline which was only rated for 60W @ 2 Ohm and 90W @ 1 Ohm. Since I bridged the dual 4 Ohm voice coils in the sub, the 60W @ 2 Ohm seems to be the perfect power level for it.
Maybe somebody can move this into the interior/audio section where more people can see it and it's more relevant.
"They call me Mister Tibbs!"
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2008 Tuscani GT V6
Injen CAI - headers - custom Borla exhaust - HIDs - Supercharged
You neva had me... you neva had your car
Last edited by Mr.Tibbs; 11-22-2015 at 11:45 PM.