Im trying to build the most musical and most efficient voice of the theatre system possible. I now have the cabinets so now i need to find all the xovers drivers and horns together. I wont be using modern solid state equipment..mostly tubes..ive been looking for 515 with original 20ohms cones but next to impossible to find originals and the replacement 15ohm cones change the impedance and sensitivity and maybe the sound and makes them sound like a 515b? What horn driver would you recommend? 288 20ohm 802/806 a/b or 290 16ohm?. What horn would sound most musical? the 8 cell 1005 or 15 cell horn? And lastly the crossovers which is the most confusing to decide on and at what crossover connections points would give me the full spectrum maximum musicality his lows excellent mids 3dimensional sound. There are so many altec crossovers out there i dont know where to start. Hope someone very familiar with the early 16/20 ohm drivers horns woofers xovers and their sonic abilities can give me some actual experienced advice on everything..thanks so much.