Joeb,
When we say an amp has 500 Watts, we only mean that it is capable of dishing out up to 500 Watts when called for by the source. What's more, volume alone doesn't directly relate to power (Watts). (A bass tone at normal volume may demand more Watts than a piercing high pitch tone). So you can have a zillion watts without worrying about blowing the speakers.
Of course, your volume control can blow a speaker even with a low power amp. However, with your 804's and even most lesser speakers, your ears will usually hurt before you ever get to speaker damage.
When we say an amp has 500 Watts, we only mean that it is capable of dishing out up to 500 Watts when called for by the source. What's more, volume alone doesn't directly relate to power (Watts). (A bass tone at normal volume may demand more Watts than a piercing high pitch tone). So you can have a zillion watts without worrying about blowing the speakers.
Of course, your volume control can blow a speaker even with a low power amp. However, with your 804's and even most lesser speakers, your ears will usually hurt before you ever get to speaker damage.