Currently Being ModeratedJan 25, 2012 11:32 AM (in response to yimmi2000)Re: Spider III 30 Watt loud noise when guitar cable is plugged in.
The 1/4" input jack/board internally could have an open/short. To really know for sure, a qualified repair tech should confirm this to be true in person. You've done everything we would've suggested to try as far as customer diagnosis goes.
There may be an Authorized Service Center (ASC) of ours in your area. If so, please consider having a repair tech at the facility diagnose the suspected internal issue and provide you with fix options: http://line6.com/service_centers/
Currently Being ModeratedDec 10, 2012 8:05 PM (in response to yimmi2000)Re: Spider III 30 Watt loud noise when guitar cable is plugged in.
Not a guitar amp expert but let me suggest the following. Generally it's pretty abusive to plug an instrument into a powered amplifier. I believe it has to do with the retaliation characteristics of the input stage but someone more expert regarding input stages of these amplifiers might know better. You might consider simply installing your cable into your guitar followed by installing the plug into the amplifier followed by powering up your amplifier.