My experience with the little cubes is that they are quite in-efficient and need a pretty good amount of power to fill a decent sized room with sound. Then again, you can't expect much from a tweeter sized driver that they are using full range. As such, look for a receiver that is capable of 4 ohm operation and a relatively high power level at 8 ohms. Once you find this, you'll be all set once you decide to upgrade the speakers : ) Sean
>
>