J.Reed

I personally would go with the XL. In fact I did lol and for the reasons above. Being able to upgrade power would be a very nice added feature. Again purly opinion and just that. I have NEVER tested the lvl 4. Good luck either way ya go.

I have not tested them side by side to tell you, but adding some enclosure specs might help other that have. On a guess I would say the XL. Higher motor force and higher sensitivity. Again this is PURELY a guess.

Todd does great work (HIGH priced) and SQ based, but some of these other guys can do as good if not better in certain areas. What kind of work are you looking to get done? If SPL look at some of the other guy

they are single coils and selectable guys

thats the problem. You are wired to a 1ohm load and the amp is only stable at 2. Switch them to 4ohm and enjoy.

My first guess would be impedence to low. How are these wired and specs of amp?

Nice vid! Very informative

AQ HDC3 aluminum coil would fit the bill, but some of the above choices are just as nice for a spl setup.

Would be small on net at like 4.5 per doing 3. That Would help with power handling some and you will be at a higher impedance than running all 4. So it could work, but I think your on the best track going walled. once you get it sorted I KNOW you are going to have some fun with it this summer lol

If you wanna keep the 2nd row you could wall at the c pillar possibly. Port area would be the concern here because of so much surface area going to the subs. Another option would be Doing 2 in a sub up, port back config. You would have spares for if something should happen None the less walled will be fricking sweet. If I could give up the 2nd row I would be walled already, but my ride still takes the family out and about quite a bit lol. Good luck with the build man! keep us posted.

Not offended at all. Just don't wanna see you WAIST money when you could see better results going with a more optimal route. No way in hell 4 18s will fit in my 05 Navi unless walled or losing 2nd row. Unless it was a cramped waist of time and effort enclosure lol. Thats why I opted for 15s. I could give them an optimal enclosure, go non-walled and has a cone advantage over 2 18s which was the next alternative that fit well. I can trick all day and do over 153db Usaci outlaw style on just one 3500d. So very similar power and basically the same vehicle with DC XLs.

IM running 4 15s, subs up port back in a Navigator on ONE 3500d.1. Don't know how thats not similar. Less cone and power at that. Hair tricks are no problem at all. I could do hair tricks with 2 L7 15s and only two ZX1000.1s in the same vehicle. As I said before the enclosure will make or brake you. If you have the larger newer expedition you "might" be able to fit 4 18" subs up port back with 2nd row still in, doubt it, but walled or going to 15s would be even better. I also designed a box for 2 18s in a 4 Runner on 1800rms that can trick all day long. Subs up port back. Again Enclosure WILL make or brake you. If you cram 4 18s with low net and port area its not going to do half as good as doing an OPTIMAL enclosure to what FITS the vehicle. 4 18s and 5k power is more then enough if designed correctly ie enclosure that works well with the equipment or could also be the biggest waist. Sometimes less is more.

i was helping him in another thread and this depth leaves 7-9 inches between the port and the door ( i have the same body style burbsn too) i told him this would work good only thing i dont have is sub disp. or bracing disp. withch either wont be much. Without going to look to see for sure. I remember sub displacement being around .23ish

They maybe different then the Navi. Mine had a 3rd row. With it gone and a fake floor in its place i get a whopping 16.5 cube gross matching the 2nd row seat angle to gain there and matching seat height at 17.75" tall. I only have 6 inches from box to the back hatch wall. Going taller cuts the airflow forward and IMP rise is higher too. So finding 8 more cubes just to get ideal net? Then displacements? Not going to happen without a wall or losing 2nd row. Unless as i said it is different then the navi with is the same thing with a different badge lol