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The spacing your dad is probably talking about is at the back of the unit. I had to do a little trimming of the plastic back there to get my decks to fit.
Anyway, I previously owned the 6500 and I now own the 6600. There are quite a few differences between the two. First the 6600 has one additional output over the 6500, specifically for the subs. That makes three aux inputs on the 6600 over two on the 6500. Second, it has a High Pass Filter, the 6500 does not. This is designed to filter the music coming out of your stock speakers so only certain frequencies (that you choose) come out. There is the option to run the subs with all speakers working in your car, as opposed to the 6500, you could only run the front speakers when you were in sub mode. Now, how do I explain this? On the 6500, there was an option to run in sub mode. When this was on, you would have all the settings in your Audio to control the level and output of your subs. When this was turned off, you could not adjust you subs. There is this same option on the 6600, but it runs with all of the stock speakers, as opposed to just with the front speakers. The 6600 also has more adjustability as far as sound goes. I think it is quite a bit better than the 6500, and well worth the money.
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