It took me less than a minute to find this in the description of his turntable on the Audio-Technica site-
"But in addition to the USB output, the turntable also comes with a detachable dual RCA output cable and is equipped with a built-in selectable phono preamp so you can connect directly to your home stereo, whether it has a dedicated phono input or not.".
Try another source- if you had to turn the volume control up to maximum and all you heard was treble, turn the volume down to minimum and set the switch to LINE, as it shows in the manual. Read the manual.