I think Atmasphere makes an important point. For me, loudness can mean many things, not just the ability to produce sound that measures 120 dB!
From my perspective, in addition to absolute level, it includes rise time and the ability to produce a given level cleanly and without stress. I've never heard live acoustic music sound distorted or harsh. Yes it may become too loud to be comfortable but that is a function of sound pressure levels. Reproduced music on the other hand can become uncomfortable for me to listen to long before it becomes so loud I need to turn it down or leave the room.
So back to the OP question, I suppose it becomes an issue of finding speaker/amp combinations with sufficient headroom and low distortion. After that the specific choice is a matter of personal taste -- a point emphasized by many of the replies here.
From my perspective, in addition to absolute level, it includes rise time and the ability to produce a given level cleanly and without stress. I've never heard live acoustic music sound distorted or harsh. Yes it may become too loud to be comfortable but that is a function of sound pressure levels. Reproduced music on the other hand can become uncomfortable for me to listen to long before it becomes so loud I need to turn it down or leave the room.
So back to the OP question, I suppose it becomes an issue of finding speaker/amp combinations with sufficient headroom and low distortion. After that the specific choice is a matter of personal taste -- a point emphasized by many of the replies here.