I have an iAMP 500 and a CXL-112. At practice I usually play with the gain at 3:00 and the volume at 1:00 to 1:30. EQ flat (sometimes some mid boost but not this time). P bass with the volume and tone wide open. I saw a post where Tombowlus mentioned that the deep switch seemed to be designed for the CXL-112, so I tried it. Well the sound started farting on the low notes, so I switched it off. Still got farting on the low notes. Neither the overdrive nor the clip leds came on. Now I am not blaming the deep switch. I almost never noddle between songs and if I do I play quietly (concert/stage band background). The farting is not noticable when the band is playing, so this has probably been happening all along For those who know this setup, has the amp run out of headroom, or do I need more speakers?