Greetings. I just got an 08 s2000 and notice that the front speakers seem to make the headrest speakers irrelevant. There seems to be very little power coming out of the headrests. I pulled the head unit and tried switching the +/- connections in every possible combination but still, although I do get sound, it is just a lot weaker than expected. Is it common for these to blow ? The previous owner did leave a big amp, capacitor and bass speaker disconnected in the trunk. Thanks for any useful suggestions.