This speaker is all time favourite of many users here. I happen to have two original ProAc 2.5 woofer speaker laying around the house, so thinking of doing this project..and so happen another user in another forum already started this project. So will be interesting to learn of his project experience and share the knowledge. Here is his project link..
http://myoldvintagehifi.blogspot.sg/another link with technical info to built the ProAc 2.5 spk..
http://www.justblair.co.uk/blog/137-diy-proac-response-25.htmlI have done a circuit simulation of the ProAc 2.5 crossover circuit using the Agilent ADS to look at the crossover frequency point and phase response. But will redo this exercise as a new project.. Next is to find a cheap source of the speaker box and crossover circuit parts and scan speak tweeter.
The original ProAc 2.5 use some kind of 'tar like wood pieces' to lay inside the speaker cabinet wall beside using the glass fiber, so the voicing of original speaker may be different due to the damping material, may have to experiment more to get the final voicing.