petrik - Where are you taking this measurement? At 1 meter? The listening position? The hiss levels you are measuring do look high. For comparison, I have copied this from a post I made earlier in the month in the 'New phono stage in the Pro models thread':
I did check my D800 once with a iPhone app sound pressure level meter. With the Devialet at +2dB, the hiss + background noise just about hit 50 dBA. I tried this again yesterday with the 1000 Pro, this hit the 50dBA mark with the amp on about +1 to 0dB. Mindful that the 1000 Pro is more powerful, this looks more or less an identical result to me. OK, not a truly scientific test, as the ambient noise level is not that far below 50 dBA, but based on a sample of one amp, I would say the Pro is no different.
(for the record, this is with the phono stage set to 400uV)
http://devialetchat.com/showthread.php?t...s#pid52138
I did check my D800 once with a iPhone app sound pressure level meter. With the Devialet at +2dB, the hiss + background noise just about hit 50 dBA. I tried this again yesterday with the 1000 Pro, this hit the 50dBA mark with the amp on about +1 to 0dB. Mindful that the 1000 Pro is more powerful, this looks more or less an identical result to me. OK, not a truly scientific test, as the ambient noise level is not that far below 50 dBA, but based on a sample of one amp, I would say the Pro is no different.
(for the record, this is with the phono stage set to 400uV)
http://devialetchat.com/showthread.php?t...s#pid52138
1000 Pro - KEF Blade - iFi Zen Stream - Mutec REF10 - MC3+USB - Pro-Ject Signature 12