You have to realize the MC2100 is a 40 year old design! Transistors weren't quite developed back then as they are now. I think you would hear a lot of background noise with Avantgardes. If you want an inexpensive McIntosh that would sound significantly better then the 2100, try the 7100. It is much more modern and will be WAY quieter, not to mention better looking.
If you have your heart set on the 2100, go ahead but you are warned. ;) Good luck! Arthur
If you have your heart set on the 2100, go ahead but you are warned. ;) Good luck! Arthur