QuietEclipse29
10+ year member
CarAudio.com Elite
don't think I'd be trusting that thing then, or I'd at least be double checking with an o-scope. I could see some very high end HU's maybe being clean at 100%, but something like the Pio 600 I highly doubt.
Do you have access to an o-scope as it'd be interesting to see how the 2 compare...
I think the DD-1 is a great tool, and where I live there's no where near me with a O scope to compare.