For years I have been using the BlackBerry Music Gateway product to get the audio from my phone to my car's system. Sound quality and volume are excellent, but it has some bluetooth related issues, forcing me to look at a new solution. I purchased the Griffin BlueTrip AUX adapter, and while it works perfectly from a bluetooth perspective, its volume output is probably about half of what the BlackBerry BT adapter puts out.
This is a real problem, so I either have to go back to the BlackBerry device, or boost the volume. I bought a FiiO E6 amp, and while makes the sound quality/volume meet my requirements, the device isn't car friendly. It requires for it to be turned on manually, then I have to select the right audio mode.
So I am looking for an affordable portable headphone amp, which turns on as soon as it receives power (either 12VDC cigarette lighter or 5VDC via USB), and doesn't require any intervention. Does such product not exist? I can't find anything like it :(