Thank you very much for all the reply. I tried other better audiophile test disc, it doesn't have this problem. So, I think it is that particular CD's problem. Although the Rotel RC1070 don't have that problem, but then when I listen to other discs, it is not as good as the AI. The tubes are 6h23n-eb, and the seller said there are less than 50 hrs on it.
The rest of my system:
Sony BDP350 Blu-ray player
Maverick Audio tube magic DAC
AI L1 preamp
Rotel RB1080 poewr amp
B&W CDM9NT speakers
cheapy power cord and interconnects
However, I have 2 PS audio statement SC power cord, and a soundsilver interconnect coming.
The rest of my system:
Sony BDP350 Blu-ray player
Maverick Audio tube magic DAC
AI L1 preamp
Rotel RB1080 poewr amp
B&W CDM9NT speakers
cheapy power cord and interconnects
However, I have 2 PS audio statement SC power cord, and a soundsilver interconnect coming.