1) The CMII is an excellent amp with lots of soul, especially if you start experimenting with different small signal tubes it can become extremely "soulful".
2) In many Tekton test reports they are much less sensitive than their spec. e.g. ~ 93db
3) "At idle" still depends on your volume setting. More sensitive speakers will require a lower volume than less sensitive speakers for a given loudness. The amount of hum, if any, will be equal because of relative volume settings between more or less sensitive speakers.
In other words- go for it. The CM II delivers and sounds better than most solid state amps regardless of price.
2) In many Tekton test reports they are much less sensitive than their spec. e.g. ~ 93db
3) "At idle" still depends on your volume setting. More sensitive speakers will require a lower volume than less sensitive speakers for a given loudness. The amount of hum, if any, will be equal because of relative volume settings between more or less sensitive speakers.
In other words- go for it. The CM II delivers and sounds better than most solid state amps regardless of price.