This is a discussion on Harman/Kardon Drive and Play works with iPhone within the iPhone Accessories forums, part of the Apple iPhone Accessories category; firmware version 1.1.1...
firmware version 1.1.1
with the wired fm transmitter on the the hk d+p1 i have a lot of interference. it may be a situation of the location of the phone to the head unit of my car. do to the length of cable that comes with the dp1 and the location of the control box of the dp1 in my car, my ipod and iphone are no more than 18 inches away from the head unit, and i do get a lot of interference when the iPhone is not in airplane mode, but not any more interference than any other fm transmitter that close to the head unit with the iphone.
i would also recommend getting the wired fm transmitter for the dp1 because of the poor strenth of the wireless fm transmitter. especially if you live in any moderatley populated area. also the last time i looked crutchfield.com was giving the wired module for free with the purchase of the dp1.
also i used it before with firmware 1.0.2, no difference after the upgrade.
hmm then it must be my drive and play, for some reason it stopped working after i upgraded it.
Does the iTouch or iPhone also charge when connected to the HK driver and play? I have a Belkin device that works fine with my older iPod, and while it works with the iTouch for audiop and playing, it will not charge the iTouch.