VT- It is not always about the power of the amp-efficiency of the speakers can also be a contributing factor. As JM mentioned the receiver is a 40 wpc which would work well for most speakers from that time period. However it sounds like you have some more modern speakers that might be a little power hungry and the 40 wpc is just not enough. You probably need to decide whether you like the receiver or the speakers because it just sounds like they are just a good fit for each other.