Yes, because it will sound better. All sorts of reasons why multiple sets are bad and not really any on the opposite. That's debatable... If 4 random Joes hop in the truck and go.. hmm? what the fuck i hear no sound back here because its all in the front. That's going to be bad, but if 4 SQ gurus hop in the truck and go ahhhh now this is nice. See the difference? What may be better for you.. isn't better for someone else. Now you can get technical with it and name off multiple reasons on why it will/would/should sound better, but i suggest people try it for themselves because your ears are different from others. He is talking about sound staging. And you really sound not be building your audio for your passengers, unless you are paid to drive them. Your ears, your equipment, you're the driver, your money, your car.