DENON POA-4400A MONO BLOC - Has anyone heard these amplifiers and if so where they any good ?
Yes .. think PMA850 (although that is an integrated) with more balls.
Clean sounding, built like a tank and almost doubles its output into 4ohms but I never got to try them into less than 4ohms back in the day so I wouldn't guarantee they will handle below 4ohms.
I was castigated in an earlier comment for saying "use your own ears". Well the thing is it has to be the case. If you are getting them for a bargain price (under £500) then they might be worth a punt (as you can sell them on for no loss hopefully) but to be frank I think a change to these from the 909 would be a side step at best and certainly not a significant step change upwards (and quite possibly a step backwards).