Amp first approach to build a system. Anyone did it ?

Speakers first. Why? Because the room is the thing you have the least control over so gotta get the speakers and their setup right.

From there, choose an amp capable of driving the speakers to their max, add a good quality source, and voila!

Is there a rational argument for amp first? I suppose if one has a strong preference for a specific amp. A SET comes to mind. If that is your thing then perhaps nothing else will do. Your speaker choices might be more limited but the right ones are still probably out there somewhere. To each their own.

@inna 

I think that you meant "Has anyone done it?"

I’ve always considered the source and speakers first and move on from there.

I’ve always considered the source and speakers first and move on from there.

While I have not done this myself, I might be tempted given the amp I currently own (a clone/re-build of a Western Electric 133A amp).  The other amps I have are also low-powered amps that require fairly high efficiency speakers.  Really good amps make a lot of difference, so it might make sense to at least look primarily at that type of speaker, that is, if I were in the market.  Right now, I am more into upgrading my existing speaker.