Lexus LX470 Skar Subwoofer Upgrade (Factory Location) 

Great video man, def reached a bass head's RU-vid recommended. Ohms are a measure of impedance, or impedance to electrical current flow. A larger Ohm rating equals a greater load impedance. A higher impedance load will result in less amplifier output for that impedance, for example an amplifier will output more power at 2 ohms than at 4 ohms. The wiring you did is called "Series" and wiring + to + and - to - would be a "Parallel" wiring in your case being 2 ohms but you wired to 8 which is correct for your vehicles amp. Your factory "sub" more like a midrange it seems disconnected from the surround of the woofer. Cheap speakers can do this from playing over the years but that Skar EVL 6.5 should do and sound a TON better. Great video!

Another couple reasons it may not be as "loud" as before 1) newer speakers like Skar Audio have much lower sensitivities (in simple terms sensitivity is a measurement of decibel output; taking the reading 1m away with the speaker @ 1 watt) so with stock amplifier power it may not be giving the speaker as much power as it is rated for. 2) the enclosure fasteners might not be adequate for the higher weight of the speaker over time it may crack the edge so i'd be weary of that, as well as, the enclosure may be not sized appropriately, not much you can do besides a custom box but those are pricey. For bass on a budget I think you did a fantastic job.

Can you fit 8 inch sub in here?

Will this work for a 2006 Land Cruiser 100 series too? My Sub speakers blown

What year is your lx470?