Cable noise

I was running a 25 foot cable from my SanAmp Bass Driver to my Rumble 40 Amp and was getting a 60hz buzz (I.e. AC power) . The amp is functioning as a monitor for me and the drummer and We are also going through the “House”. I had an extra cable a little heavy-er duty that was 15 ft long which seemed to cure the buzz, but I had to reposition the amp to get the cable to reach.

I don’t think a balanced cable will work with the amp input. Could I get a 25 foot length to work with a better shielded cable or is 15 feet the limit?

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a good quality 25ft cable will do the job, especially if it’s after an active device (the Sansamp).