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Are 15 inch speakers very much deeper sounding than the the 12s? Are 18's worth it? I was considering getting one of the 15 or 18s if they are any good.

18"s are for SPL.... for daily driving.. whats the point? but a nice single 15" is a good choice.. usually the bigger the subwoofer the more lows it can pick up. and the more "rms" it can handle.. not really too much of a difference... a single 15" vs. a single 12" in the same exact car/enclosure/amp..etc.. the 15" Should be louder.. but if i really had a choice and had to run a single sub it would probably be a 15"(given if i have enough space, i used to run a single 15" Adire Audio Tempest actually).

the 15" should be able to handle the lows much better but might not be able to move as quickly and keep up with fast-paced songs (as compared to a 10").. but thats just how i look at things, it may not be correct.

This actually brings a question to my mind.. is there a way to do a good setup with multiple-sized subwoofers? like the alpine installs... they had like 3 10"s, 12"s, and 15"s in some car... are these sort of setups mainly for show, or would they actually sound good. my guess is that they would have a crossover on each sub and had each size playing a certain frequecy.. so the bigger subs woudl play the lower frequencys, and then the smaller subs (10"s or 8"s could be used to play higher bass frequencys (such as those in Late Night Tip)

*dont know how to deleted this so..*

Would the output from the HU be considered RCA? Would it fit directly into the amp (as in with no adapters/connectors)?

Hopefully this pic explains what im thinking.

the fifteen will handle deep bass very well, with high output if given ample power, but you'll want to cross the 15" sub over at a lower point, like 50-60Hz, and use 8" midbass drivers for midbass and anything between teh 15" or larger sub and the midrange drivers. If you go with smaller subs, they can cross over at higher points without issue.

Anyone want to comment on if the above picture would be correct? Would I need any more adapters?

PS: Dash=HU... I didn't know that when I made the picture.

Thanks :)

the image is small and hard to make out and I have no idea what it's supposed to signify honestly.
is that supposed to be a head unit driving two door speakers, and the head unit's pre-outs going to an amplifier to drive a sub enclosure? if so, that's pretty normal for a system.
as for the diagram though, why did you show ground? you didn't show a head unit, or power source, or signal lines as separate or labeled so showing a ground seems rather pointless.

if you want to diagram a system, this is a more accurate way to do it, chaining devices as they'll be connected in the system:
http://www.wickedcases.com/charger/system.jpg
http://www.wickedcases.com/jeep/system.jpg

Sorry, I had a much better picture but then the limit for uploading on this forum prevented it so that picture fit within the 15k limit.

In the VB212PKG, will the amp included within that package accept imput from a 30w*4 HU?

any amplifier should have RCA inputs.
you need to see if your head unit has RCA pre-outs to match.

for larger images, you need to host them somewhere else instead of uploading them. then use the "[img=http://www.yoursitehost.com/image.jpg" command