Hums caused by radio frequency interference from florescent lights & computer screens.Ground loop caused by a break in the guitar cable ground shield.Ground loop caused by a computer's USB port connected to your DP32SD's USB port.Ground loop caused by external or rack-mounted gear connected to your DP-32SD. Possible other sources of ground loops and hums: If the DP32SD's electronics find another (shorter) path to ground through something else connected to the DP32SD, a ground loop results.Įven though it presents when you plug in your guitar, the guitar may not be the actual source of the hum that you hear. There is also a route to ground through any equipment or instruments connected to the DP32SD. Its typically due to interference due to low-quality. Your DP32SD is grounded through the three prong AC plug. Hiss, Buzz, Hum, or electrical noise / computer noise are the most common problems, and the cause of these problems are usually the same. A ground loop sounds like a low frequency hum or buzz. A ground loop exists when the DP sees more than one path to ground. When you touch the metal you are disrupting a ground loop. "when I touch the metal on the chassis the hum goes away."
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