There is no bass, lack of soundstage. After changing to the vintage amp the sound is complete different, the ammount of bass I expected on my Denon are there, the sound is more... Well best in every single aspect. It is like having a complete new speaker. Just so you can see the difference, when listening to 2 channel mode ( pure direct ) my wife would say she hated. for that reason I would only listen to music on 5 or 7 channel stereo mode, but when the Sansui ( vintage one ) were hooked up she even asked me if all the speakers and the sub was on. She said the sound was much better, almost like when all speakers are on.