differences between the V3 and the V4 unit:
1. the menu in general is the same but the font is different and smaller than the V3 unit.
2. it now has mp3 ID3 tags and they are written under the tracks list (and it is quit small). but! the very disappointing thing is that unlike the RDS info that is being shown in the MFD+ screen on the dash, the ID3 tags are not being shown on the MFD+ screen and it still only shows the track number (like in the V3 unit)
3. unlike the V3 unit that had a big delay when you where trying to raise the volume and lower it with the steering wheel control buttons, the V4 has no delay!! so that is a very big improvement.
4. the Navigation menu is different.
5. there is no longer an external mic option, only internal(but since Mindrunner says that the internal mic works better than the external one, I guess that this does not makes much of a difference).
6. the car that I installed it in is a MK5 golf with no rear view camera, and when I tried to shift it to reverse the unit did not enter to the OPS screen, and actually had no reaction to me shifting to reverse(even when I did it while in the Navi side). so everyone that don't intend on connecting a camera or does not have an OPS system will not have to suffer that the unit changes to an option that is not installed in their car.
7. there is a brown wire that is comming from the main wire (the one that is being connected to the cars radio connector) and "av camera" is written on it, I think that it is ment to be a power source for the rear view camera (but it is only a speculation)
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V4.
http://audiosources.net/viewproduct.asp?id=883