i am about to get that 9815. how do you like it so far? have you figured out all the eq's and stuff yet? i have heard it is a great unit, but takes some time to learn. i think i am going to pick one of those up and a us acoustics amp with some cdt comps for the front. i have a dd 9515 with a jbl in the back for now, but plan to take it out for a more sound quality install.
as for the hu question, i believe that the quality of some hu's are better than others. some use diff/ technology to process the sound. most people don't get external amps for the speakers and just run them off the hu. that is why people say that you should notice a difference in the aftermarket hu then stock. aftermarket hu's usually have more power to push to the speakers making them sound smoother and can get louder. the stock hu in the cruisers don't have much power at all. any aftermarket hu should be an improvement to it. i think you will notice a difference if you choose to buy the aftermarket hu and wil like it.
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