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PreSonus Firestudio 2626 asymmetrical clipping distortion positive side -6dbfs, bad units on Ebay

I wanted to find out if anyone has had a simiar problem with PreSonus Firestudio 2626 asymmetrical clipping distortion issues. The positive side only of recorded waveforms clip at -6dbfs on some channels as can be seen and verified in my DAW(Sonar).

to get -18dbfs

I read that I should get my peaks at -6dbfs and the rest at -18dbfs

so on my keyboard I can pound a single note and get -6dbfs at the peak and then the sustain will drop down to about -18

or I can pound a chord (which makes it much louder) so I have to adjust the input knob down

so should I use a chord to get my levels right?

is this the technique you use?

Peak level @ 0, -0.1, -0.2 or -0.3dBFS?

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Out of curiosity what do you guys use as standard?

I know (from listening experience and from a TC Electronic paper) that a lot of consumer CD players will additionally clip the signal beyond 0dBFS when D/A'ing and things are so hot.

In which case I suspect -0.3 instead of 0dBFS doesn't make any difference - probably should be at least -3dB or something..