Yes, I think they are power hungry. I used these speakers in an installation I did recently. The budget did not allow for separates. They were driven by a mid level Marantz receiver.
They sounded I thought good a low volume. But when pushed they had a distinctly "gritty" sound and the receiver that was well ventilated got pretty warm, so I resisted pushing them. The impedance is 4 ohms and a little below in that in the real power band region of 250 to 700 Hz.
So I do think those speakers require beefy amplification and not receivers. I told them not to push that rig hard. I think it will have to be revisited and separates installed. I did measure the FR and will report on this later.
I got this FR from the mains.
That rise at 3 to 7 KHz made them sound a little bright. The experience did confirm my opinion that receivers are basically miserable.
I would not advise driving those speakers from a receiver. I really would like to hear those speakers driven from a decent amp.
I would get and amp of at least 150 watts per channel and comfortable with 4 ohm loads. I really regard those speakers as 4 ohm and not 6.