<https://line6.com/support/topic/16128-alesis-alpha-112-fizz/#comment-118768>
<http://schema.org/text>
"I'm using the Alesis Alpha 112A's  successfully with Boss GP-10, VG-99, Peavey Vypyr Pro , Fractal Axe-FX II Ultra+ \n  \nI do not own a Helix, but I do hear high end fizz on the Alpha 112A's  when i use my Firehawk FX with FW 1.20 - rolling down the high EQ on Firehawk helps. \n  \nI imagine similar procedure can be performed with Helix. \n  \nFWIW - when I demoed the Helix at LA amp show, I thought it was a bit too bright and could benefit with some EQ with lowering the high Frequencies above 8Khz   \n  \nBut wanted to inform any fizz you hear would also occur on other powered cabs  - Alto TS112A ( which the Alesis Alpha 112A is based upon),  QSC K12, Yamaha  DXR10, EV ELX112P , etc.  sounds like a gain mis-match, or ground loop  / switching power supply issue in your configuration. \n"
<https://line6.com/support/topic/16128-alesis-alpha-112-fizz/>