Yep, placement plays a HUGE part in it's performance. Even moving it a few inches in some cases will make a difference.
I had a real problem with music. The low stuff was there, but there didn't seem to be any "kick". It took alot of fooling with placement to get it where I was happy.
The other thing to remember is that most "consumer" speakers have bloated bass/mid-bass, and this is what you were used to hearing. With a "real" speaker, this gives the initial impression that they are lacking bass. This will change with more listening. (My ears took about 2 to 3 weeks to adjust)
I would also reset the L/R mains back to 0db as reference, and adjust the REST of the speakers up/down from there.
Here are my settings:
L/R: 0 db
Surrounds: +1.5 to 2.5 db depending on the source.
Centre: +2 db
Sub: usually at -12 db, but I will cut it to -17, or goose it to -6. Gain on sub itself is at 3/4 volume. I should really turn down the gain, but the 600 is a pig to move, and I'm lazy. Adjusting from the receiver is easy enough.
