These are horn speakers. As you might imagine, they produce a great deal of full range sound. Ironically, horn speakers can do this with very little power. A small 30 watt per channel amp would be sufficient.
NYC Audio & AV Show '12 --- TAD Room --- The TAD speakers had a very airy sound, but of particular note was the amount of deep down, tight bass that was coming out of these 'compact' speakers which was astonishing. I spent some time looking for where they might have hidden the sub-woofers but there were none. TAD CR1 loudspeaker ($37,000/pair), Viola amplification and a digital front end comprising the Weiss Man301 server ($9000) and Weiss Medea+ D-to-A converter ($19,000).