David, I was fortunately able to return a PH NS after I heard, and measured via Adjust +, significant channel imbalance. I took the output curve picture to the last AXPONA I went to, and showed it to AJ Van den Hul (who was kind enough to look it over). His feeling was that my cart had some significant construction issues, likely related to the suspension. He didn’t think it was worth fixing if I could return it. As I said, I was fortunate to have purchased it from a great seller, so I did return it. I was unhappy as I’ve heard a PH with no similar issues, and it is a wonderful sounding cart.