Op had a dual 8 CStang enclosure before, ported may not address what he's used to or wants. Tlines are a once bitten thing... the low power, bandwidth and output usually spoils users. Check Diyma for threads and discussion about pros and cons. Tuned and setup correct a Tline only needs levels and crossovers set. Even an marginal driver performs well above Fs. I never tune lower than Fs myself as a 1/4 octave tuning at 50hz in car should dig deep and flat (25hz?)NVX has really high quality equipment at a really good price. I would recommend 2-10" speakers in a ported wedge-shaped box. Face the sub and port backwards. Also, remove all the sound padding on the rear deck and put baffles over the rear deck speakers. The baffles will protect the speakers from the pressure of the subs.
Wire the subs up for 2 ohms.
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XAD14 3000W RMS X-Series Full-Bridge Class D 1-Ohm Stable Monoblock Amplifier
Product Details: Class D 1 ohms Stable Monoblock Amplifier RMS Power Rating: 4 ohms: 1100 watts x 1 channel 2 ohms: 2000 watts x 1 channel 1 ohm: 3000 watts x 1 channel Total power output: 3000 watts CEA-2006 Compliant Amplifier Pulse Width Modulated MOSFET power supply Wired remote bass level...nvx.com
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VCW102 Version 3 (VCW102v3) 2000W Peak (1000W RMS) 10" VC-Series v3 Dual 2-Ohm Subwoofer
Product Details: 10" Dual 2 ohm VC Series Subwoofer Power Handling: Peak: 2000 watts RMS: 1000 watts Carbon Fiber Enhanced Non-Pressed Paper Cone Custom High Roll Foam Surround with black nylon stitching Die cast aluminum vented basket Dual progressive-roll spiders with integrated flat-braided...nvx.com
Oh I can recommend 2kw on a set of capable 10s but Op has been around, overthinking everything and not ready to buy anyway.