Heres (HOPEFULLY) all the info you need regarding the Avatar B210 cabinet decision a lot of us had to make. Hopefully this info makes the decision easier. I went with the Kappa Pro for the below reasons. There 2 main contributions to their tone, the woofer itself, and the length of the port. They use a shelf porting style. The length of the shelf port has a good factor in the tone. The longer the shelf port, the deeper the low end. The shorter the shelf port the more punch you get from enclosure. Per Avatar, they used different port lenths for the diffrent speakers becuase they feel each speaker benifited most from the lenght choosen. I've done my homework and here's what I've come up with. Hopefully it helps some out there. B210 Neo - $269.00 - 40Hz - 3.5kHz - Freq. Response Weight 44lbs 600 watts Longest Shelf Port of the 3. Deepest low end of the 3 due to shelf length along w/ 40Hz response. Lacking mids compared to both Delta and Kappa. Also a little sloppy. Neo speaker doesnt react as quickly. Lightest of the 3, and best bottom of the 3. B210 Delta $229.00 - 65Hz - 3.5kHz Freq. Response Weight 55lbs 700 watts Middle Length Shelf Port of the 3. Bottom is so/so due to Middle Length Shelf but 65Hz is not so good though when using as a stand-alone. More of a mid-driver. (Some say cab suffers due to 65Hz low end) Tight, Lots of Punch, with good midrange. Weight is average B210 Kappa Pro - $279 - 45Hz - 3kHz Freq. Response Weight 64lbs 1000 watts Shortest Length Shelf Port of the 3 Bottom is very good due to 45Hz Response. Pairing up with the short length port, which adds Midrange punch, you have a great cabinet that has a loads of punch with a great low-end response. (Comments from Avatar) Kappa does everything that the Delta does in terms of punch, but does even more due to lower frequency response Our best 2x10 Heaviest of the 3.