Originally Posted by enricoclaudio
Have been a week since I got my 105D and I love it. I have it plugged into my Parasound Halo P5 via balanced interconnects. With some tunes I can hear a little bit of distortion at some frequencies, more than distortion I think is clipping. I had the volume in the Oppo at 100 but yesterday I bring it down to 75 and even at 80 there is no more distortion or clipping, so I opted to set the max volume for the stereo out at 75. Does this sounds right?
The P5 has a gain of 10dB and a rated maximum output voltage of 7V. That doesn't mean it will clip at exactly 7V; it depends somewhat on the input impedance of your amps and a measured clipping voltage may in fact be higher than this, especially with higher impedance amps.
Given the stated specs, one can compute the maximum input voltage that "could" cause clipping if the volume on the P5 were dialed up to its maximum 10dB gain:
dB ratio = 20 log (V2/V1) ---> 10 = 20 log (7/V1) --> V1 = 2.21V
The BDP-105D specs show a maximum output voltage of 4.2Vrms on the XLR outputs.
This yields a dB ratio of 20 log (4.2/2.21) = 5.57 dB
Since each volume step on the 105 corresponds to 0.5dB the calculation shows that you would have to limit the BDP-105D to a maximum of 88dB to avoid clipping on the preamp for a very loud recording and again, this would be with the preamp set to maximum volume.
It may be that in fact you were clipping at the amp. One can compute the clipping criterion for your amp too given its specs but with the preamp in the circuit one would need to know the voltage gain/loss your preamp volume control is dialed to in order to ultimately know the maximum output voltage from the preamp. Typical amps clip at 1-1.5V which is way less than the preamp is capable of producing.
Incidentally, I own the Parasound JC 2 BP preamp and for 2Ch listening its volume control is actually set to attenuate
the signal from the BDP-105 around 10dB. Without the preamp in my setup, I would need to operate with volume levels on the BDP-105 around 45-65 vs the 65-85 I am able to achieve with the preamp in the circuit. I feel that this higher BDP-105 volume improves the macro dynamics. This is with the amps I have, in my setup.