Affordable musically fast subwoofer


I am looking into acquiring an affordable and musically accurate subs, which will pick on the lower end notes of my Horn loaded single driver fullrange speakers. Besides those terrible 100+lbs subwoofers that retail 2-3k, is there something out there that is not necessarily hernia producing but that will actually be quick and musical enough for my horns?
The RELs are too expensive....decent used ones about1k+
The ACI Titan, seems to be decent, but still too heavy and moderatedly expensive at 1K+
The VBT Magellans, sophisticated, but the full set up, I wonder how good.
what about those mini SUNFIRE subs?
Any other ones that are easy to acquire in the used market?
bemopti123
Vandersteen 2W or 2Wq. An outstanding bargain - three 8" woofers, 300 watts; very musical and unobtrusive.
Vandersteen 2W.You run the sub off the amplifiers output thus retaining the main amps signature in the sub.Great price used also.If you really want to do it right I suggest building your own.You will learn exacally what it is you desire in a sub by building your self.The flexibility in chosing a driver, encosure and what amp to drive it along with the proper equalizing(parametric).There is a trial and error period but that is where you learn what about bass you like.How about an Adire Tumult sealed.An Adcom GFA 555mkII amp (bridged mono).A Behringer digital parametric and you have world class for under 1000.00.Good luck.
VMPS is well known for some of the best bass available. Prices are very reasonable. Check out the site:
http://www.vmpsaudio.com/
You can find out more at the VMPS circle at audiocircle.com.
The designer, Brian Cheney, has been known for over twenty years as offering some of the best bass available and things haven't changed. Prices are great bargains for what you get. These are passives so will require an amp, but that's easily affordable considering the price of the subs.