Rory had said he would mark this question as off-topic:
There have been questions answered about audio in the past ... I'm not seeing as why this is off topic. I mean, by these standards, tires would be off-topic because they are a mechanical thing on the car, just a piece of rubber. Audio equipment is part of the vehicle itself, so IMHO, it should be on-topic. Yes, there is a cross-over into the grey area of electronics or audiophilia, but this happens quite a bit on most SE sites. Should questions like these be off-topic?