i have a jensen jta-460 turntable and it has 1 red and 1 white plugs in the back only,when i plug it into my denon avr-1802 receiver that is about 10yrs old and has 1 red and 1 white phono plugs in back also. i chose the phono setting but it comes through distorted? when i plug am/fm, of dvd, tape ect. it is clear but not much amperage(power) it seems. why isnt it as simple as plugging the line out, again the only red/wht plugs on the back of he turntable to the red/wht phono on the receiver?