More power is generally better at all volume levels. Wattage ratings can give some indication of an amplifier's capability, but an amplifier capable of higher current levels will help to eliminate distortion when the amplifier needs to reproduce sudden bursts of power. Speaker efficiency, room volume, decibel level, and other factors determine just how much power is enough.
Expensive speaker cables DO make a difference (mostly in your bank account!). There are, however, some excellent cable designs that are worth the higher price. You don't need to spend thousands of dollars on cables to get good performance, though.
Expensive speaker cables DO make a difference (mostly in your bank account!). There are, however, some excellent cable designs that are worth the higher price. You don't need to spend thousands of dollars on cables to get good performance, though.