Is this typical Service?

You mentioned the hum coming from the amp and not the speakers, you may want to pop the top and tighten the nut and bolt holding the power supply as I own two of there 25 amps and I noticed one of them having a slight hum. I gave the nut and bolt holding the power supply a slight tightning and no more hum. One other thing is excesive DC on the line as this causes hum in the transformers. Maybe worth checking into before you send it off. If you go to psaudio.com they have great info on hum and what causes it.

$75 and hour charge is reasonable - and pretty consistent with what I've experienced with other companies. In my experience, the minimum service charge is 1 hour which I think it fair. 4 hours minimum to check them out seems really high - especially if nothing is wrong. Did I misunderstand you? In other words, they told you that it will cost at least $300 each, $600 total to check them out. Something is wrong there.

I just sent one of my M200's back to B&K to check out an intermittent fault - it cost me $96 including labor (1 hour which is the minimum), parts - one part bad (a switch) and few other minor parts they replaced to bring them back up to Spec, packaging in a brand new factory box, and shipping cost back to me.

Daveherm69: Since their purchase by B&W about 4-5 yrs ago, Classe is no longer a "CDN company" as you say...for true CDN stuff, check Anthem, Linar, Bryston....Classe is now a big international company and their warranty policy may not be as easy-going as it used to be. On the other hand, you can tell by their new products that the cash influx from B&W made them move up the ladder. Quality ladder I don't know but the look and price sure have moved up!

Beheme is quite right, Classe' is now an international company.Still they showed amazing concern that we work out our issues. I do have to wonder how on earth Classe' ever got the nerve to offer a life time warranty way back then. I'm glad they did though.
Regarding service time,Classe' stated their technicians are very meticulous and it would take a minimum of 4hrs.per unit.
I also inquired about having some gain added to the m/c section they said it could be done at a cost that probably wouldn't exceed $100US.

Dave- I am glad to see that this all worked out for you and eventually echoed my experience having the voltage converted to 120v when I bought a DAC-1. Great sounding unit and they did the work quickly and economically (course that was before they were bought). I do know that my local high end tech charges $150 minimum (2 hours) for bench work.