Joe X

Those subs are generally considered daily subs with average sound quality but I couldn't answer which are better since it's a brand that is not used on here and personally I have not used them. What is used on here are mainly Sundown audio subs and for a cheap alternative skar audio subs. for bass amps the great majority of people use taramps Brazilian amps which quite frankly I would never own not even for free.

The Juggernaut 15D2 which I was looking at is basically 20mm Xmax which is ok for a medium power subwoofer so no problems there. How you aim your sub and port depends on the vehicle, aiming up in trucks can cause the windows and roof to flex and cause rattling in some cases but not always, one must run a few tests before deciding what is best. Also bear in mind that when running more than 1000 watts rms you generally need electrical upgrades which need to be added to your total system cost. Since you have two trucks I would recommend making a plan for each and decide which you will do first, take measurements for a sub box and total costs and then go from there.

The Juggernaut is 19.8mm Xmax, so take care where you get parameters from, the manufacturers recommended box internal volume is best but if you need lower volume like 4 cubic feet you should be fine, you can use the model you entered and lower the volume to see the effects. Other than that there are many subs out there if you are not set on that brand, from the parameters looks like the juggernaut is higher efficiency with higher cone area and lower MMS, which means it will get louder for the watt, to that end the larger box will help.

You can use marine grade plywood and use phenolic glue to build the box.

kydream did you use 4" round ports? Nice box BTW.

You have ample port area which is extremely important, tighter volume is good for fast bass and musicality which some people prefer over maximum output, still I was ready to draw the 10 cubes box but you didn't ask, as before you can reverse mount the subs to seek that extra output if you decided to test that, pics or whatever you want to share are welcome specially to inspire others.

Are you saying you exposed your speakers to water? If both left and right speakers turn silent when that happens most likely your car stereo has become faulty or have loose power terminals, if it happens to the left or right speaker only it may be an issue with the speakers or you may have wiring issues. Happily these days can be very inexpensive to replace car audio parts if needed.

OP you cannot ruin an amp by using it at it's rated impedance UNLESS you don't have proper electrical upgrades, if your input voltage drops below 12V as you play loudly THEN an amp may overheat and get damaged. Make sure you have the electrical upgrades for the power you are running and you will be safe. Also quit many upgrade cycles as you will end up spending much more than needed, decide what power you will be running and buy electrical and subs to match, you know, if it ends up getting too loud you can always turn it down.

Looking at the model the sub will not get damaged in an 8 cubes box on rated power but the larger box will play less flat and you will lose some sound quality and the box will get heavier.

Look to build a 4.5 cubic feet net enclosure with 60 square inches of port area tuned to 32Hz. Pretty big enclosure make sure it fits before building.

There is also this, cheaper and multiple units: https://www.sonicelectronix.com/item-159041-Cerwin-Vega-CFMANL125.html It is from a known brand so it should be at least what it claims to be, the 125A rating will work as a 120A fuse replacement no problem.

All_Ears_On_Me, that was fast.

Here is a high quality fuse available in 120A: https://www.knukonceptz.com/product/nickel-silver-plated-150-200-250-300-amp-anl-fuse/

For daily use 3.5 net with 50 square inches of port area, tuning 32-35 Hz, dual 0.75 layer baffle, strong cross bracing or window bracing. BTW Sd is 540 cm² (not what they list)

Post this in the amps section. With that amp you will not notice any difference and with sound quality amplifiers higher impedance may slightly be better but nothing dramatic. Usually a bad sub enclosure design, poor electrical or poor gains settings or crossover settings will be far more damaging for your sound quality than wiring impedance.