I own an RM100 and today just got an RM1250. The thing is totally lifeless compared to my RM100. I put the exact same tubes in it as the RM100 and it just sounds flat. I know the RM100 is a beast compared to the poweramp but does the tone really vary this much? The low end is OK but the presence isn't even close to the RM100. Who has both that can tell me if they also have a huge difference? So far I'm just sending the 1250 back and definitely won't be doing an RM4/power amp setup if this is the difference. Please don't write you have an RM4 setup and it sounds great unless you have both to A/B because mine aren't even close to sounding alike. The RM100 is easily 10 times better sounding.