If you're willing to fork out for a hardware solution, the
Motorola T505 connects to the phone via bluetooth and transmits over FM. I use it in my car for both hands-free talking as well as listening to Pandora or Amdroid.
I have a 1999 Nissan Altima, and it has a double DIN CD / tape / AM/FM head unit that I considered (briefly) replacing. Instead, I opted for the same solution - the
Motorola T505, and after buying it I tested it at home with my home unit and found out it also works
while charging. major benefit - no scrambling around to find the cassette adapter after the battery runs out on the T505.
I bought a USB A to USB mini B 5 pin cable from monoprice -
For only $0.84 each when QTY 50+ purchased - USB 2.0 A Male to Mini-B 5pin Male 28/24AWG Cable w/ Ferrite Core - (Gold Plated) - 1.5ft | USB 2.0 Cables - Mini-B 5pin Type - and a Dual USB power converter for the cigarette lighter -
Griffin Technology: PowerJolt Dual Universal - Car charger for USB devices - and away I go.
Now, I get to charge both phone and T505 whenever I am in the car, and I can use the built in mic for voice calls (return audio is routed through the stereo) and all music is also routed through my stereo.
When I go to my next car, if it doesn't have native BT audio input, I'll have this solution to fall back on.
Tape deck??? LOL. What year car are you driving? Why not invest in a decent head unit with an aux input so you only have to deal with a stereo cable?
While doing it through the FM is convenient, it usually sounds like crap and you will probably get static interference. I don't know about the bluetooth and the quality, but the best, cleanest sound is always via a direct connection through a cable IMO.
Head unit replacement is not exactly cheap, and I'd rather spend $50 on a cheap solution then $150 for a replacement of a headunit, then add more money for speakers, amplifiers, etc....
The MOTOROKR T505 is the exception to the rule when it comes to static. As opposed to every other solution I have tried for DROID --> FM, this one uses a digital FM transceiver, so my 10 year old (really 12 year old, if you think about it) head unit has no problem locking on to the T505's signal and will only give me problems on stations that are broadcasting at high power / extremely close by (IOW, if you hear static on the frequency when the radio is on, the T505 covers it - if you hear static / radio station mix, the T505 still covers it - the only time the T505 gets overpowered is when you have a very powerful broadcasting station on the same frequency.
Like I said, I have tried other solutions already - bought a Griffin one from BestBuy, bought one from Satechi online (from Amazon) and have had FM transmitters in the past as well. Not a single one has had the clarity of the T505 - it is in a league of its own when it comes to transmitters.
Finally, in another thread, one user complained that audio over BT then converted to FM would sound horrible. For an individual who can discern audio quality between 192 and 256 bit rates when compressing music, I can say this - an audio purist who can discern changes like that *will* notice a diminishing of the music, but I am pleasantly surprised to say that the conversion does extremely well, especially if Pandora users go into the settings / preferences and change the audio quality to High (In my area I almost never have an interruption in music flow, except one notorious dead spot area where all coverage goes out, even cellular).