Hey man, nice thread you got here... i am going to have to pay somebody to install my head unit, (and amp/s and subwoofer/s aswell if my dad can't) i'd like to know that it is in the hands of professionals who really know what they are doing and not just some young kids who are just experimenting with it. Half of my dad's career was being an audio/visual technician and the other half is a security technician (neither are automotive). I never realised how complicated all the sound stuff is untill i asked my dad afew questions about it. I ask him something simple like "which ohm rating for rms is better? 4 ohms or 2 ohms" and he explains to me in every little detail what an ohm is and what the ohm's law is and then he explains some more about distortion and a whole bunch of stuff i just can't understand without some sort of education in the field. I can never remember it, hes just like an old man raving on about his childhood or something. It's amazing how complex sound really is. I think qualifications are vital for installers considering that there are potential fire and/or electric shock hazards involved.