I just recently set up a small HT system in my bedroom but am using some cheap Bose speakers (2" or 3" paper cone with plastic wedge shaped enclosure). The enclosures are rattling at below moderate volume levels and is quite distracting. The Bose speakers run thru the passive crossover (about 80Hz I think) in my small 8" Klipsch sub. So to give me something to do I was thinking of creating some small bookshelf speakers to sit next to my TV in the armoire. I'd like to keep the cost of all drivers and tweeters below $100.00 (and thats either for 6 units or 4 units). The space I have to work with is 5"w x 20"t x 15"d. Since the width is 5" I was looking for 4" midbass drivers (1 or 2 of these) and a warm sounding tweeter. I'm still not sure whether I want two 4" drivers per side or one (MTM or MT). I want them to be as rich and full sounding as possible should I not have the sub turned on. I checked out Parts Express and found: Tang Band W4-992S 4" woofers. They say they provide excellent bass in a small package. Parameters are: Power Handling: 50 watts RMS/100 watts max / *VCdia: 1" / *Znom: 8 ohms / *Re: 7.0 ohms / *Frequency range: 55-2,500 Hz / *Fs: 55 Hz / *SPL: 86 dB 1W/1m / *Vas: .20 cu.ft. / *Qms: 2.93 / *Qes: .40 / *Qts: .35 / *Xmax 3 mm / *Dimensions: A: 4-9/16", B: 3-3/4", C: 3" Using WinISD .50a6, with the above parameters and a few more, 1 driver per box, in a vented enclosure I get the following: Enclosure Volume = .128 cu.ft. Port = 1 Tuning Freq. = 63.23Hz Port Diameter = 4.02 in. Port Length = 63.62 in. And I am -3Db at 64.0 Hz. What am I doing wrong? If I change port Diameter to 1" I get a port length of 3.39" which seems fine. The enclosure volume seems awful small for a vented enclosure (.128). If I up the box volume to .20 I get a bump in db's at 74Hz and then I'm -3db at 56.96Hz. How in the world do you design these things??? I haven't even gotten to tweeters and crossover's yet. ACK!!