| Re: Two eD 13Ov.2 D4
Chuffing is port noise. Noise from the turbulence and compression of air flowing in and out of the port.
Humming I am not sure about. There are a couple bits that can be wrong:
1) mechanical noise from the spider or vc rubbing somewhere or the tinsel leads smacking things.
2) harmonic distortion. A good test for this is to play a sine wave of 20Hz. Crank up the volume slowly. You should not hear anything. At some point you will probably hear chuffing. Another thing you might hear is 40Hz or 80Hz. If your drivers are good you should be able to get pretty high SPL before you "hear" any note.
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