<https://line6.com/support/topic/16128-alesis-alpha-112-fizz/#comment-121067>
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"I hooked my Marshall cab to the Engl and wow! \n  \nI did try my pa helix-mackie-crown-jbl's. I need to work with my pa setup more as sound was something that left me wanting. \nGoing to say I'm still a newbie with PA system and pro audio, and my crown amp is a class d power amp.  \n  \nGoing to defend the crown real fast in saying I have played music through my PA system and it sounded great. \nThe early days of class d amps were used mostly for bass as the class d THD is kinda high but playing at low frequency with a distortion level that the human ear could not pick up. And in car audio the class d would put out more energy than class A,B. That is a big thing when you are getting your power from batteries and alt's on a 12-15 volt system. \n  \nBut nowadays class D amps can play midrange and highs really well. The added bonus with class D amp is light weight and less heat. \n  \nSo I'm going to study my mixer a little more before hooking the Helix to it again.  And I think my Yamaha amp is class A power so I may give it a try. \nClass A or class A/B power amps have the best clarity with low THD ( total harmonic distortion) but they build heat faster and weigh more and are not as power efficient as class D amps, though when your plugged into the wall socket for power this doesn't mean much. \n"
<https://line6.com/support/topic/16128-alesis-alpha-112-fizz/>