Same situation here, although i have a Denon 2801 (90wpc x5).I just wasn't happy with 2 channel. So, just last week i picked up a used NAD 218 amp (225x2) and boy did it make a difference. My speakers really came alive and sounded like a new pair. Anyway, as mentioned above, a SPL meter and the onscreen Denon menu will adjust the sound level.
However, there is one thing you should know, if the external amp does NOT have a 12v trigger, you must turn the amp on/off each time you power up the Denon or listen to 2 channel. If your Denon has a 12v trigger, then locate an amp also w/ a trigger. this will link the two. good luck and your moving in the right direction.
However, there is one thing you should know, if the external amp does NOT have a 12v trigger, you must turn the amp on/off each time you power up the Denon or listen to 2 channel. If your Denon has a 12v trigger, then locate an amp also w/ a trigger. this will link the two. good luck and your moving in the right direction.