Sorry for a late response, I have been away from my computer. I have tried Lowthers on M.King transmision line, on Open Baffle and on Front horns, really the best setup for lowthers is front horns they sound very sweet (unlike to how they sound on boxes), even on front horns that load down to 170 hz they dont really go that low, on OB I was cutting them a 100 hz and they were having trouble with that...I do believe Lowther to be the most Dynamic dynamic speaker...lets rephrase that, the most dynamic cone speaker...It gets totally killed by compression drivers, I compared head to head Lowther DX3 and Altec 906 and the difference was night and day (plus I hate whizzers)
For a limited range you can even find more dynamic cone drivers than lowthers (Beyma, 18sound) but for a longer range Lowthers are indeed very good, the thing is that they step on Compression driver territory (500-800 hz) and they have nothing to do there in comparison!
I am actually using a Beyma 1" driver from 1.2khz instead of the Altec 906 I had (I may be changing these soon for either Radian or Beyma 750) I have a 170hz Exp horn with an 18sound driver that goes lower than the Lowthers did and have a fuller tone.
I do have a Supertweeter from 6khz up, the Compression Driver was having trouble on complicated symphonic passages going all the way up.
I love huge Symphonic music I used to have a pass for the local Theater but traffic jams have kept me starving for music. On the best dynamic system I listened to I never could get a full orchestra to play correctly and so I lost interest on reproduced Classical music, once I got into front loaded horns and got a system that could play Classical music properly I almost only listen to it when doing critical listening, for gatherings or parties I play everything.
Once you can listen to the violins on the left, Violas on the center-right and cellos on the right, trumpets on the right mainly and Precussion on the back left you know it is getting there, Last night I was playing Borodins Plovtsian Dances and when the percussions came in (minute 3:10 Antal Dorati version) I jumped off my seat!
Not to say Girl with guitar music doesnt sound good, it sounds wondefully deatiled dynamic and present, but once you have the luxury of a full orchestra playing just for you, its hard to pick something else!