Even with a surge protector/electronic noise supressor I only get a 15-17 audio quality, but when I disconnect the power cord and go to battery use only I get a 25-30 audio quality/accuracy. Do you have any suggestions as to how to remedy this problem? The source of the problem in my opinion is the Lenovo power cord that plugs directly into my laptop. I have three different power cords for the laptop and all have similar problems. Thanks.