Momentum Stereo amp is a combination of high end electronics and art. It is surprisingly small but quite heavy at slightly less than 100 lbs. The exterior is a combination of polished cast aluminum and milled copper. There are no heat sinks as such. The thick copper plates make them unnecessary. The stereo Momentum s said to be identical to one of the monoblocks except for a smaller number of output transistors.
This particular unit is a store demo and comes with the manufacturer's five year warranty! It looks brand new, but has operated long enough to be fully broken in. Also included is the suitcase-like case made from thick industrial plastic with wheels and a pop-up tote handle (why don't all big amps come with one of these?)