I had a Denon PRA-1500 paired with a Denon POA-1500 and it was a wonderful match musically but had to get the amp gain and the preamp gain set just right. I did experience the same with the gain on the PRA-1500 but once the volume came on, it came on. Slow at first but rapid volume change after 9:00. I had the combo paired with a pair of vintage Klipsch Fortes and once the volume heated up with the Fortes high efficiency(98dB), you couldn't turn it down fast enough. Overall a very musical combination with very fast transients and very thumpy down low.
Does the POA-2400 have gain controls? If so, play with it a while until you get it right.
Bill
Does the POA-2400 have gain controls? If so, play with it a while until you get it right.
Bill