Unfortunately it ALSO bypasses the HPF. (Their manual doesn't mention this but it's been confirmed by myself and many other ZP3 owners.)
Everyone seems to have that hiss.. and anyone that says they don't probably haven't tried turning the bypass feature off or don't have great hearing and just...
@Avvocato In your Noise Floor Test, I'm wondering if that silent background you experienced was with the Bypass mode enabled? Because in my unit there's a high frequency hiss coming out of my tweeters if bypass is not enabled.
This same issue with the ZP3 is being reported all over the internet...