I want to design, engineer, spec, and then contract out the building of my own bass cab. Unfortunately, I have never done this, so I'm asking you all for help! There are a couple of these types of threads going on, and while I've learned a lot in them, I don't think they're 100% pertinent to my musical needs. While none of the specs are set in stone, they have been churning around in my mind for quite some time, and I would appreciate any advice given. I'm thinking a two way design involving a 15" or 18" (sub?)woofer transducer crossed over to a JBL E-120 that I have sitting around for the mids and highs at approximately 600Hz (whatever the 20th overtone of my low B is). I may put a tweeter in, but since I've never liked the sound of a tweeter in a bass cab, I'm saving that for v2.0. Plus, the E120 has plenty of high end for me. I think my first order of business should be a woofer. To that end, I have a couple of requirements. 1) I want at least 15" of woofer. While I know Sd is far less important than Vd, with today's high xmax drivers, I see no reason not to go >= 15" for maximum volume, and since I'm running it crossed over, beaming shouldn't be a problem. 2) I'd prefer a ceramic magnet. While I know that magnet material has little to no bearing on the tone, I'm not a fan of the ecological ramifications of neodymium mining/extraction. Plus, I'm a young and relatively strong 24 year old man. Not going to pass judgement on people who use Neo speakers, just trying to lessen the white liberal guilt. 3) 4 ohms. I have not studied crossover design yet, so this is the one I'm so far least sure of as my mid is an 8 ohm transducer. However, if I can pair a 4 ohm woofer with an 8 ohm mid without any deleterious effects, then I think I'd like to go that route. After perusing USSpeaker, this driver http://www.usspeaker.com/KilomaxPro-18-1.htm seems to tick a lot of boxes. Has anyone used one of these before? It has the Vd, the ceramic magnet, and has the Greenboy seal of approval. I have a lot of questions about cabinet and crossover design among many other things, but this post is getting rambly enough, and I don't want to go on before I choose my drivers. Thanks again for any and all help!