Why does my Yamaha setup sound better than the Luxman 595?

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I have the Luxman 595 class A amp. I also have the Yamaha r-n2000a used as a preamp to the Yamaha AS-3200. Ether system will use the same Sonus Faber Lumina II speakers. These speakers could be considered on the bright side.

I don't know why, but the Yamaha setup (preamp and amp) sounds a bit better to me. It is more open sounding and the sound stage sounds better. The Luxman has the vocals and instruments more forward than the Yamaha, which I like alot. The luxman also will have some instruments stand out more since they are more forward, which is good. But the Luxman sounds more flat and closed when compared to my Yamaha setup (preamp and amp). Why is this?

I listened to a Luxman for a bit with some very high end speakers and I had a similar impression of the sound. It was not the speakers and at the time I thought it was the room. It was still very nice, but not my preferred presentation.