It all depends on how much larger an enclosure you can fit there, and how much sensitivity you're willing to sacrifice.
Just keep in mind that it doesn't take much of a loss in sensitivity to require the amp to reach its peak output on transients (clipping). It might make more sense to add a small powered sub or two that can also fit on the shelf and keep the bookshelf speakers that have served you well up until now.
Just keep in mind that it doesn't take much of a loss in sensitivity to require the amp to reach its peak output on transients (clipping). It might make more sense to add a small powered sub or two that can also fit on the shelf and keep the bookshelf speakers that have served you well up until now.