waveguides from JBL 338784-001 - dual 350412-001 - dual 90 x 50 444878-001 - dual 60 x 40 338800 - HF 5024540 - MF Well, a year later, but that is what I am considering as well. Use the JBL 5024540 with either the Audax 13LB25Al mid or the Alpha 6a in an adiabatic enclosure. The Audax is actually more sensitive than the open back Alpha 6A, and there will be some modification at the throat area to match each driver. The Alpha bolts directly, but the Audax requires adaptation. The lower freq limit is unknown until I complete tests, but I expect around 500-600Hz, maybe higher. The mouth could benefit from a decreasing radius added to "finish" the profile. Was thinking the Seos 10 could be utilized, perhaps with a CD. The issue with the Seos 8 & a dome is the throat area is too large to provide much directivity control above around 6-7KHz. So you would need a unobtainable sensitivity (for a dome) to really make it usable with the other proposed drivers. The Audax TW025A26 shows quite high sensitivity, but look at the distortion! Never saw a distortion test result THAT high.... It seems to use a dome tweeter in an appropriate waveguide, and have increased sensitivity up to at least 15KHz, one needs to reduce the throat dimension. Has anyone found a 3/4" tweeter suitable to test? Or design a dome throat interface that would accomplish the same thing - and now one is designing a CD. So then, what is the appropriate CD for high quality audio? I have heard mention the Denovo DNA 450 & 360, but no data seems available. Also the newer CDX1-1730 & 31 (Celestion), again no data. If I decide to get these drivers & test, I'll post the process. There are some graph pictures on the Celestion CD's in a plane wave tube, and on a specific horn.