Classe DR-15 amplifier compared to Classe Dr-9

Classe DR-9's/15 I had both amps. The Dr-9 amps are more refine to my ears and with more weight and growl Than the 15. the Dr-15 is a later design/product and has no association with Dave Reich the original designer of the 9 and once owner of Classe. I am sure there are memers who see and hear it another way?

You say"not as fast as todays amps".I wonder if tomorrows are faster than todays and so on where we'll be in say 25 years.I wonder if one day they'll stop going so fast.I love this site,where else would we go with these observations?Sometimes I feel like science-fiction is becoming the norm...thanks for that,cheers Bob

I forgot to apolgize for the hijack of a legitimate question of which I have no answer,thanks,Bob

I was a Classe dealer for many years and this is how I remember it:

The DR-15 was indeed designed by David Reich AND Glen Grue and was a class A/B amplifier. The DR-3, DR-8 and DR-9 were pure David Reich designs and pure class A. They had a darker, warmer, more mellow sound than thier class A/B brothers.

I had a pair of DR-8s running mono on a set of Apogee Stages and it was one of the most beautiful sounding systems I have evr heard.

Not sure if I would swap out a pair of DR-15s for DR-9s? I think it's probably a side step and not an upgrade per say.