I have a JVC RX-884VBK Home theatre Receiver. It's served me well for the past few years. I'm looking to replace it in the next couple of months with a better receiver, something with both DD EX and DTS ES. Lately I've been reading about receivers with the built in Auto Setup/ Room EQ function (Yamaha and Denon are two that come to mind.) What exactly do these functions do? Is it worth having on a receiver? Is it the same as the setup I do with the SPL meter and matching audio levels of the speakers? I know that the JVC RX-884VBK probably isn't medium level quality compared to the equipment you guys have experience with. I'm just looking for some suggestions on makes and models, and sources of info. Thanks.