I just remembered that when I had the HPM's connected to my Technics 65 watt per channel (1970's 2 chl) receiver they sounded great. When it died I tried a late (1980's 2 chl) 100 wpc receiver and they sounded like you described. I then purchased a Sansui 8080 (1970's 2 chl monster) 130 wpc, they sound great like the Technics. Recently, I tried connecting them to a Denon 4308ci 7 chl 130 wpc receiver and they sound tinny, as you described. I don't know why but these newer receivers don't seem to send the low frequencys to the mains like the older receivers did. I'm wondering if it has to do with them being designed to have a sub. I had the Denon set with no sub large fronts 2 channel direct and the sound still didn't rival the sound when connected to the Sansui.
