Big Difference does not exist at ATC.
This may come as a big surprise as most manufacturers offer an array of wildly different sounding speakers to suit a variety of tastes.
As for ATC, throughout most of their line differences are quite subtle. The active three ways (50 and above) are a step up in SPL and effortless clarity (approaching absolutely deafening levels with the 300) but soundwise the difference in timbre with their two way 20 or 19 is subtle indeed.
In essence you simply gain bass extension and dynamic power with the bigger models. IMHO, the Active 100's are already ludicrously dynamically overkill for most home users but to me that is what should drive your thinking - if any. FWIW: if you get any of the Active 100's or above then you have a speaker with their premium midrange driver (what they are really known for and what is used by Sting and so very many others...) To me aesthetic craftsmanship cabinetry/pride is the main issue after that whether you want Anniversary or not. Remember ATC staff don't do woodwork - that is outsourced - they are primaruly acoustic engineers - their main focus is to design and build transducers and amplifiers and sound systems for prestigious clients...a box is just a box although one with gorgeous veneer/woodwork will cost a darn site more (even if it has similar guts).
This may come as a big surprise as most manufacturers offer an array of wildly different sounding speakers to suit a variety of tastes.
As for ATC, throughout most of their line differences are quite subtle. The active three ways (50 and above) are a step up in SPL and effortless clarity (approaching absolutely deafening levels with the 300) but soundwise the difference in timbre with their two way 20 or 19 is subtle indeed.
In essence you simply gain bass extension and dynamic power with the bigger models. IMHO, the Active 100's are already ludicrously dynamically overkill for most home users but to me that is what should drive your thinking - if any. FWIW: if you get any of the Active 100's or above then you have a speaker with their premium midrange driver (what they are really known for and what is used by Sting and so very many others...) To me aesthetic craftsmanship cabinetry/pride is the main issue after that whether you want Anniversary or not. Remember ATC staff don't do woodwork - that is outsourced - they are primaruly acoustic engineers - their main focus is to design and build transducers and amplifiers and sound systems for prestigious clients...a box is just a box although one with gorgeous veneer/woodwork will cost a darn site more (even if it has similar guts).