infernox wrote:Also why are the celestion's so great?
It is subjective of course, but many of the great amps have celestions in them. Both celestions (usually in vox/marshall) and Jensens (usually in Fenders) are fantastic speakers.
If the amp has a scooped sound (cut mids) you will find a speaker with a scooped frequency response will sound dark and unimpressive due to the superposition of the responses. So a speaker with a flatter response, or even a mid boost might sound better.
That is just one example, there are many factors such as sensitivity, resonance etc etc...
It all depends on what you want your amp to sound like.
So see celestion as the tried and tested design. However, they have made some pretty kak speakers too...