Sorry, should have been clearer. On tge rear of the amp there is an input marked “phono/aux”, this is normally a high level input like all of the rest and not suitable for turntable use. However this amp could be bought with an optional card installed for use with a turntable which takes a the much lower voltages from the turntable cartridge output.
If you do not have the optional card you phone will play the same through all of the inputs, if it is installed it will be very loud on the one marked “phono/aux” (so when checking out turn the phone volume off and slowly increase).
The reason for this is that cd, tuner, phones etc. output a signal at around 2V which the amp then increases to a level that can drive the speaker (typically by around 25 times). The cartridge on the turntable only outputs either 5mV for a moving magnet or 0.5mV for a moving coil version which need further amplification to get it firstly up to 2V somthat it can then be increased up to speaker voltage. The phono input also has filtering to take into account pre-emphasis built into the recording and manufacturing of the records.
So, if you plug a turntable into a normal 2V line level input it will sound very quiet as it is only seeing about 1/400 the signal it is expecting.
Easiest way to see if you have the phono card is to look through the vents in the top or take the top cover off. If there is a card like the one linked where it says “optional phono card” then you are ok if not you need something like this to boost the signal.
Project PHONO BOX (Black)
But first check if you have the optional card, then let us know what cartridge you have on your turntable and we can then go from there.
Hope this helps.