Just a few hints:
- Is your cab connected to the red (powered ) output ? ( back of the powered Kemper
- is the Volume knob ' linked' ? Output/page 2/7 " Monitor Out Link " = black? If not, your volume knob isn't going to increase volume
- Power amp on ( black ) ? Output /page 7/7
- Power amp boost is +12db?
- Is your (guitar ) cab. 8 ohm? ( I'm not shure , but if its 16 ohm, the power output is half the max ?)
- Do you use a EQ perehaps with reduced output volume?
I played two years in a rockband with my Power-rack connected to a Bogner 8ohm oversized 2x12 cab and my poweramp boost whas set to +8db, It whas extremely loud, ( as loud as my Engl 100 watt tube amp )
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