Nomada have a good point about the soft start for sure, this is why we suggest a op-amp at the input with a wide gain to compensate, but i do understand your point.

BTW last suggestion, since more than everything has been covered, and we still don't know in wich car it will be installed...

Most of those deck have a turn-on lead for factory amp and/or electric antenna and such. The use of a volmeter on the back connector of the radio will show you the truth. The easy solution of using the ignition/accessory wire it's still working too.


http://www.installdr.com/QuickWiring.html or www.google.com for radio pinout

And of course, the best one that need a few experience.. open the radio and probe the circuit to find a remote, use a MOSFET, Transistor ,CMOS buffer to provide your turn-on.

That's all for me too