I’m confused

AMX - Little to no bass playing vinyl

I am new to the AMX. I have a very simple one turntable (Audio-technica AT-LP1240-USB) setup, as I just play records and sample with it. Playing vinyl in THRU mode in Serato, there seems to be very little bass response. Any attempt to turn adjust the bass knob more than a hair results in some sort of feedback. Turning the filter all the way left basically mutes it. Phono or Line modes. I have A/B compared vinyl recordings of the same songs online, and the difference is night and day. This only occurs in THRU mode. Playing from Serato sounds excellent. I am very pleased otherwise. Please advise. Thanks.
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