You can add a few more kudo's for the QW subs here...Myself, Mike Kovach and my son all think the QW's sound good, especially for the price. As do the JBL SRX 700 series subs(when powered properly). I have also built the Fane 15"(available on the Fane international website) subs and they also rock like crazy, and are very small and light. could also easily be turned int 2X15" or 2X18" cabs... I like and use Yorkville speakers, but only have tops, and never heard the subs, but have heard great things about them. Bang for the buck here comes from getting wood dust in your hair, eyes and teeth...Small and portable, use lots of power if you want to "rattle" things. A Crown XTI 4000 with 4 per side of the Fane 15" or 18" subs are pretty impressive(yes thats 2 ohm stereo) ... but thats a goal. An XTI 4000 and 2 of the Fane DIY subs are a REALLY good start, but thats DIY and that should be do-able for for about $1500. (if you can do the work.. and they are not hard to build, you could do it with a skill saw and some basic carpentry tools...if you had to)
Gary Perrett
TZ productions