I just want to make sure I have this right. I need a sub with either a single 4 ohm voice coil or one with dual 2 ohm coils? Is that correct?

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2003 XL regular cab. 4 cyl.,a/t,Lowered,PC'd steel wheels and Spider caps.

That is correct. That's the only way to squeeze out that 150 watts from your 4 ohm amp.

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2006 4x4 3.0, Superlifted, 33x12.50 general grabbers, 15x8 method race wheels, kicker 10 inch comp rt, kicker 300.1 amp, JL audio components, bushwacker bed caps, uws toolbox(sitting in my office at work), 5% tint doors and rear.

Thanks.

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2003 XL regular cab. 4 cyl.,a/t,Lowered,PC'd steel wheels and Spider caps.

More stupid newbie questions.
New sub should be here today and I want to make sure I set everything right.
If I've read correctly,I want to use the crossovers on the head unit but,I'm still confused on the gain.It looks like the HU (Kenwood KDC-X300) has gain.Do I use it instead of the amp gain?If so,what do I set the amp gain knob at when using HU?
Sorry to ask all these dumb questions but,stupid questions are easier to handle than stupid mistakes. LOL

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2003 XL regular cab. 4 cyl.,a/t,Lowered,PC'd steel wheels and Spider caps.

If I explain it, it will just confuse you more. Google search "how to adjust amp to stereo" and one the best explanations is given by Crutchfield.

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2006 4x4 3.0, Superlifted, 33x12.50 general grabbers, 15x8 method race wheels, kicker 10 inch comp rt, kicker 300.1 amp, JL audio components, bushwacker bed caps, uws toolbox(sitting in my office at work), 5% tint doors and rear.

Did you get your sub box? You have to get it just right with these reg cabs, or you will sacrifice leg room. I spent weeks searching and measuring. I was about to make my own box, when I came across the Kicker 10 inch rt. A mid-tier loaded enclosure from the factory. A match made in heaven for a reg cab ranger. It fits between the floorboard "ridge" and just under the back-wall "ridge." Here's my setup.

Attached Images

20160716_123523.jpg (91.0 KB, 23 views)

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2006 4x4 3.0, Superlifted, 33x12.50 general grabbers, 15x8 method race wheels, kicker 10 inch comp rt, kicker 300.1 amp, JL audio components, bushwacker bed caps, uws toolbox(sitting in my office at work), 5% tint doors and rear.

That would be in a 98 plus reg cab. 93-97 are smaller. My 97 there was virtually 0 room back behind the seats. I managed to shove 2 amps and a 8 inch sub behind the seats. It helped doing explorer buckets and center console. One amp is right behind the console, the other behind the driver seat and the sub behind the passenger. Passenger seat had to be moved up 1 click. But driver seat isn't effected.

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1997 B2300 reg cab 2.3 Lima, 15x8.5 Mickey Thompson classic 2, 31x10.50 cooper discover at3, 7.5 open 4.10 rear, dynomax super turbo catback, alpine iva-w200 w/ nav, kicker 6x8s, alpine type R 8, alpine 250W mono amp, power bass 400.4, tool box & camper shell, compustar alarm/remote start.
1956 Ford F100 rust bucket with big plans!