I got home from my trip, and I found that the XLO Reference Recordings Test & Burn-in CD had come. I was going through the first 7 tests and everything seemed fine. What I found out:

-- The speakers are hooked up correctly in-phase (using the first two in-phase and out of phase tests):
-- Tried just the bass on both speakers (they are correct).
-- Tried just the tweeter on both speakers (they are correct).

-- But Test #8 (e.g. Low Frequency Demagnetizing Fade) shows something is very/very wrong:

-- On my upstairs system: (which consists of a low end Denon AVR and DVD player and Klipsh RB-5 II), I heard a low frequency hum that went from loud to soft to not being able to be heard after 25 seconds or so. This is what I expected to hear.




***** Now the problem *************


-- On my system with the Magnepan 1.6's test #8 starts out with a normal low 'rumble'. Then a second sound that sounds like a loud RATTLE starts up. It sounds just like a ribbon is loose. It occurs on both of the speakers. Each time I play this track #8, the RATTLE sounds different--so it's not in the recording. Further, the louder I play this track the more RATTLE I hear.

-- As track #8 gets softer, the rattle gets less, until eventually just the correct low rubble is heard.

--After running this "test #8" multiple times, the rattle even occurs on the right speaker in normal music. I never heard this before. Did I break something? Something strange going on?? Please help......

-- When I unhook the tweeter, this RATTLE sound is just as described above (e.g. it's just in the bass and not the tweeter).


Thanks,
Stan