Eminence Alpha8a with SEOS 12 and DNA150 I think it looks pretty nice actually. Very simple cross over. Every effort was made to keep this as simple as possible. Budget was the name of the game. Having said that though, I can't live with anything that's not quality. So I didn't skimp on quality to save a $2 part. The final impedance is a very easy to drive load, except at very high frequencies. Above 20khz this approaches 2 or 3ohms. Even lower way way up. This is really as cheap of a SEOS build I think we'll see. You'll need this from PE. And from Erich, you'll need: http://www.diysoundgroup.com/plastic-seos-12/plastic-seos.html http://www.diysoundgroup.com/waveguides/adapters/adp-11.html http://www.diysoundgroup.com/drivers/tweeters/dna-150.html And the optional flat pack enclosure: http://www.diysoundgroup.com/plastic-seos-12/seos-flat-packs/75-seos-flat-pack.html Or just the baffle: http://www.diysoundgroup.com/speaker-baffles/seos-8-ported-baffle.html All said including the baffle - $130.15 per speaker. $25 more if you wanted the whole enclosure flat pack. Measurements are shown below. I've been playing with this speaker for about 3 months. I've been playing with the idea of this speaker even longer. It sounds very good for the money. I'm really happy with it. I may do a version with the DNA-205. A few things, power handling is about 100watts max. This is a little bit tweeter and woofer related. With a 80 or 90hz sub cross over, the woofer runs a tad past xmax at 100watts. The nice thing is, this alpha8a has a great bass response, on paper and audibly. So matching to subs is a piece of cake. Just keep the xo above 80hz. The little DNA-150 is also crossed over at 1700hz. It's a slow transfer function, so it should be ok. But 100watts would push this little guy. It's down 19db by 2khz, so it would take 64 watts just to get it to 1 watt levels. This is ok. Realistically, most receivers can't hurt this speaker, but it is not as bullet proof as these other SEOS designs. Keep that in mind. The other thing is the enclosure. I put ports in my flat pack enclosure, but I stuffed it very full. Even some stuffing in front of the vents. It's essentially sealed. Check out winisd for different alignments. But if someone doesn't know how to do this and wants direction... Build it 20L and seal it. It's the easiest way to go. If you really want bass extention, ported works well with this guy too.