I am relatively new to HT and have an Onkyo 595 with the Poly RM6600 surrounds and Polk 350 sub. The system sounds terrific like it is, but everyone I talk to recommends getting a Radio Shack SPL meter and Avia Guide to Home Theater. Both seem relatively inexpensive for assuring that my HT sounds (and looks) its best! Any tips on using this for a newbie? Is it relatively straight forward and explained clearly on the DVD? Any help would be most appreciated. Thanks.