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The interaction between an amp and speaker is very complex. A lot more than just power. Dave certainly understands it a lot better than I do. Sensitivity and impedance are definitely factors. Mine are rated at 85dB and 4 Ohm, but may realistically be closer to 3 Ohm. But it goes beyond...

It’s true. They eat amps for lunch.

I know that question is for Dave, but one factor to consider is, if you decide or plan on new speakers and the ones you prefer are difficult to drive due to moderate/low impedance and/or efficiency, you probably want to start planning for external power.

I can certainly attest to that. There are definitely speakers from years back where the effort was made to progress speaker tech that are actually more advanced than many models available today.

I tend to agree with Man regarding the speakers. But, on the main question, I'd say, in general, that anyone driving seven or more speakers in their system (7.x or 5.x.2) and likes to crank it up, should at least consider a three channel amp for the front, if they already have a mid-line...