Ok, here goes!
1. Press SETUP.
2. On the touchscreen, press MEDIA.
3. On the left, you'll see AUX Input Level. Pressing the text next to it will reveal 3 options;
Level 1 (1.5v)
Level 2 (0.7v)
Level 3 (0.3v)
With my iPhone, Level 1 gives the best quality as coreying has explained in an earlier post
Peace Out!
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