Low power amps considered for driving loudspeakers are often somewhat expensive. Auditioning one on your own loudspeakers in your own listening situation is advised.
Here is an easy to read article that covers the subject reasonably well: Speaker Sensitivity, Dynamic Range, and Amplifier Output | Confessions of a Part-Time Audiophile
The SPL Calculator referred to in the text: Pro-Audio and lighting Calculators. Calculator page de dBs, plus some others that are generally handy.
Adjustment can be made to accommodate the sensitivity of your speaker and its SPL at a selected distortion level in order to arrive at a result for your particular situation.
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