Great sound at high volume

NHT 3.3's or 2.9's will play very loud.

all model ATC actives.

What are we talking about here? What's the budget? What do you consider very high volume? Very high volume only or does quality of sound have anything to do with things also? Seriously.

Not to mention what amp you would need. Some to many amplifiers will compress and/or constipate at higher volumes and/or when reproducing complex music.

The KAS (Kick Ass Speaker) from Montana Loudspeakers can deliver all the volume you will ever need with amazing clarity.

It can handle 900 watts continuous and 4000 watt peaks.

Known as the "Home Wrecker" The Montana KAS produces a three dimensional highly detailed sound-stage.

I dont know what your budget is but I run Sonus Faber extremas with dual classe audio ca 400's and they are crystal cleal almost all the way up.