>>where do you live?if someone on the board is close by im sure you could get some help from them.especially if they have a chance to hear the 600

And many of us can bring an Avia disk and SPL meter with us

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8