Noom, it is my experience that if you have to turn up the volume to hear one thing at the expense of something else, in your case to hear instruments in the background the problem isn't necessarily too much detail as a general lack of overall resolution of the system. As to what is the specific cause, it could be anything and not necessarily the amplifier.
A very good system should be flat and smooth enough to allow the listener to hear everything on the recording even at moderate levels. If you have to turn up the volume to an uncomfortable level this would indicate to me a balance and/or lack of resolution issue somewhere in the chain. Rooting out the problem can be a tough call and could be a multitude of issues. At a basic level it is most important for the amp and speaker to be electrically compatible with each other. Of course a good source component and preamp are most important for fully realizing the potential. It is difficult for me to separate out one thing over another in these matters as everything, including room, placement, components and last but not least cabling are all important for realizing satisfying music in the room at reasonable levels. The devil is in paying attention to all the details.
A very good system should be flat and smooth enough to allow the listener to hear everything on the recording even at moderate levels. If you have to turn up the volume to an uncomfortable level this would indicate to me a balance and/or lack of resolution issue somewhere in the chain. Rooting out the problem can be a tough call and could be a multitude of issues. At a basic level it is most important for the amp and speaker to be electrically compatible with each other. Of course a good source component and preamp are most important for fully realizing the potential. It is difficult for me to separate out one thing over another in these matters as everything, including room, placement, components and last but not least cabling are all important for realizing satisfying music in the room at reasonable levels. The devil is in paying attention to all the details.