I have the OEM Aux input at the back of the center armrest and have found the same. The unit sending the signal to the Aux (eg iphone, ipod etc) needs to be turned right up. If the unit is a quality unit there is no distortion and the volume coming out the radio is fine - so turn up the ipod or iphone to max and all should be good at the radio end.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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