If you choose an amp with a lot of reserve power, the advantages you will get are:
- Ability to handle a lot of extra dynamic headroom. With today's digital sources, it is possible sometimes to get about 120 - 144 db of dynamic headroom. If you are listening to a lower powered amp already at 3/4 of its max volume, and one of these musical sections slam you, your amp may not be able to handle it, if it is a relatively low powered amp. On a hi powered amp, since it is extremely unlikely you will be listening at 3/4 the max volume, such a slam will be much more easily handled.
- This also goes pretty much with the above but you are much LESS likely to clip your amp, if it is higher powered.
- If your amp is class D, you will not be paying for extra heat or inefficiencies.