| X | Area | Radius | Width 1 | Width 2 | Height 1 | Height 2 | Jeff Robinson's Midbass | fin phase plug | 1/2 phase plug | circular plug | circular plug |
| inches | Sq. inch | inches | inches | inches | inches | inches | AREA | radius | |||
| 0 | 15.904313 | 2.25 | 4.5 | 4.5 | 4.5 | 4.5 | April 22nd, 2001 | -5.83333E-08 | -2.91667E-08 | 1.0875E-08 | 5.88355E-05 |
| 1.25 | 17.323755 | 2.20482 | 5.330196 | 4.740955 | 4.032998 | 4.534249 | Exponential 72.8 Hz flare rate | 0.589240939 | 0.294620469 | 2.671765373 | 0.922198098 |
| 2.5 | 18.869882 | 2.15964 | 6.160392 | 5.006794 | 3.712999 | 4.568498 | With E.V. EVM10M it has flat | 1.153597752 | 0.576798876 | 5.270209172 | 1.295206424 |
| 3.75 | 20.553998 | 2.11446 | 6.990587 | 5.299418 | 3.489246 | 4.602747 | response from 100 to 500 Hz | 1.691169428 | 0.845584714 | 7.784025023 | 1.574081357 |
| 5 | 22.38842 | 2.06928 | 7.820783 | 5.62089 | 3.332664 | 4.636996 | regardless of how many used. | 2.199893557 | 1.099946779 | 10.20089746 | 1.801956301 |
| 6.25 | 24.386562 | 2.0241 | 8.650979 | 5.973446 | 3.225465 | 4.671245 | Low end -3dB point hinges at | 2.677532919 | 1.33876646 | 12.50741188 | 1.995302697 |
| 7.5 | 26.563036 | 1.97892 | 9.481175 | 6.359514 | 3.156218 | 4.705494 | 79 Hz for 2 to 8 cabinets. | 3.12166099 | 1.560830495 | 14.68895643 | 2.162322836 |
| 8.75 | 28.933759 | 1.93373 | 10.31137 | 6.781724 | 3.117299 | 4.739743 | High end -3dB @ 700 Hz | 3.529646245 | 1.764823123 | 16.72961517 | 2.307639899 |
| 10 | 31.516065 | 1.88855 | 11.14157 | 7.242931 | 3.103486 | 4.773992 | Straight vertical expansion | 3.898635127 | 1.949317563 | 18.61205169 | 2.43400905 |
| 11.25 | 34.32884 | 1.84337 | 11.97176 | 7.746228 | 3.111132 | 4.808241 | from throat to 31.125" | 4.225533588 | 2.112766794 | 20.31738232 | 2.543073662 |
| 12.5 | 37.392651 | 1.79819 | 12.80196 | 8.294971 | 3.137669 | 4.84249 | Straight horizontal expansion | 4.506987081 | 2.253493541 | 21.82503802 | 2.635740004 |
| 13.75 | 40.729905 | 1.75301 | 13.63215 | 8.892795 | 3.18129 | 4.876739 | from 31.125" to mouth | 4.739358861 | 2.36967943 | 23.11261401 | 2.712374151 |
| 15 | 44.365004 | 1.70783 | 14.46235 | 9.543643 | 3.24074 | 4.910987 | (You can see how around X=10" | 4.918706461 | 2.459353231 | 24.15570591 | 2.772904614 |
| 16.25 | 48.324533 | 1.66265 | 15.29255 | 10.25179 | 3.315179 | 4.945236 | Height 1 necks down to 3.1") | 5.040756198 | 2.520378099 | 24.92773126 | 2.81686764 |
| 17.5 | 52.637445 | 1.61747 | 16.12274 | 11.02187 | 3.404087 | 4.979485 | The Radius column shows | 5.100875518 | 2.550437759 | 25.39973516 | 2.843411121 |
| 18.75 | 57.335279 | 1.57229 | 16.95294 | 11.85889 | 3.5072 | 5.013734 | the corner radius for the | 5.094043024 | 2.547021512 | 25.5401785 | 2.851261354 |
| 20 | 62.452391 | 1.52711 | 17.78313 | 12.76832 | 3.62446 | 5.047983 | transition between adjacent | 5.01481598 | 2.50740799 | 25.31470734 | 2.838647849 |
| 21.25 | 68.026199 | 1.48193 | 18.61333 | 13.75603 | 3.755984 | 5.082232 | perpendicular walls. | 4.857295074 | 2.428647537 | 24.68590172 | 2.803170806 |
| 22.5 | 74.097463 | 1.43675 | 19.44352 | 14.82844 | 3.902041 | 5.116481 | To keep straight side walls then | 4.615086219 | 2.307543109 | 23.61300194 | 2.74157837 |
| 23.75 | 80.710581 | 1.39157 | 20.27372 | 15.99246 | 4.063036 | 5.15073 | you have to use the difference | 4.281259133 | 2.140629566 | 22.05161058 | 2.649385901 |
| 25 | 87.913912 | 1.34639 | 21.10392 | 17.25561 | 4.239497 | 5.184979 | between Width 1 & 2 for the | 3.848302432 | 1.924151216 | 19.95336778 | 2.520189323 |
| 26.25 | 95.760133 | 1.3012 | 21.93411 | 18.62604 | 4.432071 | 5.219228 | phase plug profile dimension. | 3.308074938 | 1.654037469 | 17.26559761 | 2.344314486 |
| 27.5 | 104.30662 | 1.25602 | 22.76431 | 20.11255 | 4.641514 | 5.253477 | maybe split into plug & side ext.? | 2.651752885 | 1.325876442 | 13.9309229 | 2.105789753 |
| 28.75 | 113.61587 | 1.21084 | 23.5945 | 21.72473 | 4.868694 | 5.287726 | 1.869772674 | 0.934886337 | 9.886845598 | 1.774001324 | |
| 30 | 123.75597 | 1.16566 | 24.4247 | 23.47293 | 5.114591 | 5.321975 | 0.951768804 | 0.475884402 | 5.06528978 | 1.269776285 | |
| 31.125 | 133.65356 | 1.125 | 25.17187 | 25.17187 | 5.352799 | 5.352799 | <==== Here is the transition point | 1.40868E-06 | 7.04341E-07 | 1.49898E-08 | 6.90754E-05 |
| 31.25 | 134.80105 | 1.12048 | 25.25489 | 5.380294 | |||||||
| 32.5 | 146.8319 | 1.0753 | 26.08509 | 5.667009 | Profile is selected to allow molding | ||||||
| 33.75 | 159.93649 | 1.03012 | 26.91529 | 5.976061 | the throat with a simple profile | ||||||
| 35 | 174.21064 | 0.98494 | 27.74548 | 6.308897 | design dispersion: 36h x 20v | ||||||
| 36.25 | 189.75876 | 0.93976 | 28.57568 | 6.667098 | single probably 70h x 40v | ||||||
| 37.5 | 206.69452 | 0.89458 | 29.40587 | 7.052383 | eight probably 36h x 10v | ||||||
| 38.75 | 225.14178 | 0.8494 | 30.23607 | 7.466615 | |||||||
| 40 | 245.23544 | 0.80422 | 31.06627 | 7.911818 | Added both blade (finlike) and circular | ||||||
| 41.25 | 267.12243 | 0.75904 | 31.89646 | 8.390178 | crossection phase plug profiles | ||||||
| 42.5 | 290.96282 | 0.71386 | 32.72666 | 8.904064 | Cinco de Mayo, 2001 | ||||||
| 43.75 | 316.93094 | 0.66867 | 33.55685 | 9.456034 | |||||||
| 45 | 345.21668 | 0.62349 | 34.38705 | 10.04885 | the circular fit is interference, which | ||||||
| 46.25 | 376.02689 | 0.57831 | 35.21724 | 10.6855 | should make it easy to attach to the | ||||||
| 47.5 | 409.58688 | 0.53313 | 36.04744 | 11.36921 | top and bottom flares | ||||||
| 48.75 | 446.14206 | 0.48795 | 36.87764 | 12.10345 | |||||||
| 50 | 485.95976 | 0.44277 | 37.70783 | 12.89197 | Use of a phase plug allows straight sides | ||||||
| 51.25 | 529.33114 | 0.39759 | 38.53803 | 13.73882 | the whole horn length (the Width 1 column) | ||||||
| 52.5 | 576.57337 | 0.35241 | 39.36822 | 14.64836 | |||||||
| 53.75 | 628.03191 | 0.30723 | 40.19842 | 15.62531 | Rear chamber volume: 630.375 cu in | ||||||
| 55 | 684.08308 | 0.26205 | 41.02861 | 16.67475 | |||||||
| 56.25 | 745.13675 | 0.21687 | 41.85881 | 17.80216 | Front chamber is a 9" diameter hole | ||||||
| 57.5 | 811.63939 | 0.17169 | 42.68901 | 19.01344 | 3/4" baffle, speaker is rear mounted | ||||||
| 58.75 | 884.07732 | 0.12651 | 43.5192 | 20.31497 | Data provided to build 3 versions | ||||||
| 60 | 962.98026 | 0.08133 | 44.3494 | 21.71362 | curved side wall or 2 phase plugs | ||||||
| 61.25 | 1048.9252 | 0.03614 | 45.17959 | 23.21682 | |||||||
| 62.25 | 1123.1719 | 0 | 45.84375 | 24.5 | |||||||
| 0 | 15.904313 | 2.25 | 4.5 | 4.5 | |||||||
| 10.15 | 31.84104 | 1.88313 | 11.24119 | 3.103329 |