Am currently using the Crown XLS 2502 and quite happy with it. Noise levels are not low but manageable. Just for my information, when you say that Crown is not a very good amp, are you comparing it with audiophile grade class D amps or with class A/B amps or with any power amp in general.
ASR has given it a recommendation.
In my view, it's a pretty neutral amp and at the price, it is a cost effective way to add power to a HT Setup. Combined with a entry level tube pre, it does quite well at stereo too. In fact, I use it over my Marantz 7010 in pure direct for two channel listening.
But please note, I have old ears and not trained to hear differences in amps.
I am comparing it to QSC RMX series of amps. The crown is also class D and I do not like class D for speakers. I am also referring to the subjective sound quality, even if you compare the XLS with the older Crowns, the older would sound better IMO.
Firstly I am not an objectivist, secondly Amir at ASR has often stated he sells and is friends with Harman people. He follows the Harman guidelines for speakers which is utter trash and marketing propaganda to put it mildly. IMO the science of audio can not currently predict if you will like something or not based on data, it is too fixated on being an engineer and less so on being a music listener.
It is cost effective, no denying that. There is a difference in the sound, to me anyway.