I'm interested in designing a 1*12 cab, as much to hear how it sounds as anything else. Before I start, I would like to check that my assumptions are right. 1. Several people have mentioned that the sound of a bass is mainly in octave 2 and upward. This suggests that for 5-string use, I would not hear a lot of difference between a cab tuned to 45 Hz and a cab tuned to 60 Hz. 2. Tuning the cab to match the speaker Fs gives you good transient response. Is transient response related to punch, and related to group delay? In other words, should I design for minimal group delay, provided the cab -3dB point remains at or below 60Hz? 3. Very few people in the audience will be listening on-axis, and a 12 inch speaker will beam high frequencies. To get better dispersion, I should cross-over to a smaller midrange unit, and use a horn tweeter above 3-4 KHz. From the above, I am heading towards a Delta 12LF in a 2.5 cu ft cab vented at 51 Hz, crossed over to an Alpha 6 (or similar) in a small closed box at 500 Hz, and an APT 200 (with an attenuator) from 3.5K upwards. My concern is that if this is an optimal design, I would expect to see several versions of it made commercially, but I haven't found any. Where is the flaw in my reasoning?