@erik_squires
Interesting. Makes a big difference having enough power. I've been a big advocate of that for a very long time. I've never had the efficient low wattage gear so have always gone for big power.
The speakers that I've been using for the last 23 years or so, are quite power hungry and per the manual, are OK with up to 400 watts at 4 ohm X 4. I feed them with 385 x 4. The difference in going from one amp to two is enormous. I found them to be slow and flabby with only one amp and they did not come to life until I had them bi-amped.
I'd love to hear the super efficient type sometime but I may never have that opportunity.