I run a Lexicon MC-12 with three passive (identical) THX Certified subs:Stereo L/R + LFE. Each sub is powered by a discrete power amp channel, also identical. The system is calibrated to 75 SPL @ 0dB Reference. Crossovers are set to the THX 80Hz spec.
I use the MC-12's internal Pink Noise generator for calibration.
When passing the calibration Pink Noise through the subs, the L/R sub output sounds like low freqiency bass with no indication of Pink Noise. When the Noise passes through the LFE sub, it sounds much different. In fact it sounds much more like narrow-band Pink Noise mixed with low-end bass. It's not a placement issue (all three subs are below and span across the bottom of the screen).
I pulled the driver from the cabinet and inspected it. From what I can tell the driver and everything else is fine. There is no indication of any speaker damage whatsoever. In fact when playing source material with LFE activity there is no indication of any problems with the driver.
And so the question is - why does the Pink Noise sound so different when passing through my LFE sub vs. the L/R subs? Is this to be expected, or is it possible there may be an obscure problem with the speaker that has eluded me?
Thanks.
-paul.
I use the MC-12's internal Pink Noise generator for calibration.
When passing the calibration Pink Noise through the subs, the L/R sub output sounds like low freqiency bass with no indication of Pink Noise. When the Noise passes through the LFE sub, it sounds much different. In fact it sounds much more like narrow-band Pink Noise mixed with low-end bass. It's not a placement issue (all three subs are below and span across the bottom of the screen).
I pulled the driver from the cabinet and inspected it. From what I can tell the driver and everything else is fine. There is no indication of any speaker damage whatsoever. In fact when playing source material with LFE activity there is no indication of any problems with the driver.
And so the question is - why does the Pink Noise sound so different when passing through my LFE sub vs. the L/R subs? Is this to be expected, or is it possible there may be an obscure problem with the speaker that has eluded me?
Thanks.
-paul.