I dont know if it will do well for the Pro-900. But I run my HFI-780 thru Qinpu Q1 Ampilfer. Thats what i would suggest.
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Source: Xonar HDAV13/w I/V 2xLME49720HA + 2xLME49710HA buffer>Qinpu Q1 Amp> Ultrasone HFI-780/Sony SS-B1000
Headphones : Ultrasone HFI-780(analog)
Speakers: Sony SS-B1000 bookshelf speakers(analog)
Amp owned:Fiio E5(not in use)
Speakers owned:Z-5500(connected to a HD TV,Wii and DVD player in another room)
Z-5300( in the closet)
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