It sounds like your accustomed to hearing really distorted subwoofers.
What DB scale do you use to measure band, what kind of music.
Thats awfully Quiet for a live band with a drummer unless your playing Jazz Fusion.
A couple of my bands were pushing 115-120dB on stage (Mostly Drummers pushing the levels).
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CRITERIA? In order of importance:
* fits in the car * can be lifted without injury * sound fantastic * cost no more than necessary
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Sorry I'm just a Danley Fan since I bought my Bass tech 7s years back (And built my own 22Hz Tapped horn).
I don't know the cost but, I think the TH-mini or TH-28 from Danley sound labs is the only thing that is going to fit your criteria. You might be able to get away with just 1 since the ting is so efficient. You will not be able to make anything comparably small or light that will out perform them. Not unless you reverse engineer his box and find a source for his drivers.
There are only a few really great 18's out on the market, I don't think putting them in an undersized box will do you any favors.
Your drums will benefit, keys will benefit and Bass.
Instruments that wont benefit are vocals unless your (Bary White, or a beat boxer), acoustic guitar etc. So if have Aux buses available don't send to subs.
A side note on the topic of bass guitar reproduction.
Bass guitar does not have massively strong fundamental on its open strings, due to the practical placement of pickups. The pickup proportionally less fundamental to 2nd harmonic ~10dB.
So a standard E bass really needs a strong 80Hz to represent its open string, and a 5 string tuned to low B needs 60Hz to represent its 2nd Harmonic.
Unless you have a bass with a pickup at the 12 Fret, you are going to need a hefty EQ curve to shift the spectral balance toward the fundamental (which sounds cool if you have a sub that will do it).
I've built a tapped horn so I'm a believer, the concept works incredibly well.
Good luck whatever you choose.
Antone-