I would use the TAD on Low F , the Altec Low - Mid and the horns above with a 2405 UHF . The Crossover points are roughly :
Tad 15's - 28 Htz to 300 ish
Altec 15's -280 Htz to 700 ish .... A bit wasted . JBL 2123 or 2122 would be better in terms of size IMHO
Altec CD - 700 to 7.0 Khtz
JBL 2405 0r 2402 . 7 to 18-20K .
Sonics are too dependant on amp , cab , and crossover design to offer any opinion . I would look to something like LAB Gruppen , Mc2 or the Crown K2 running the Tads. You have the scope t EQ what ever you want really !
Hope this helps . There are people here with the knowledge to help you if you give them all the info they need
Rich