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In the Forum: Playback Listening
In the Thread: Tightening to loosening Screws ? no fake...
Post Subject: Relative Motion vs. Frequency vs. PhasePosted by Paul S on: 10/18/2009
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My own experiments along these lines suggest that relative motion of the driver itself is a factor, along with attendent augmentation and/or cancellation of certain frequencies, depending on whether the frequencies and/or resonances in question are ultimately summarily additive or subtractive relative to what might in a given instance be thought of as the "primary frequency". Of course, it can be difficult to decide what this "primary frequency" might be when listening to complex music. This situation becomes even more complicated when we consider that such resonances may be tied to loudness (SPL), as well, and that the whole is also set off or constrained by "summing" frequencies.
There's even more to consider in the case of multi-driver speakers, such as the fact that phase is also frequenciy dependent, practically speaking, and it is also subject to summing, nulling, combing, "shadowing", and other nominally-transient acoustic phenomena that ultimately come to bear on "phase" experienced as the audible portion of radiated sound waves.
The frustrating thing for me while messing with the mounting screw tensions was that there was never a universal "best" setting that involved looseness, but it would all change with different sources or at different volume settings, or after moving the speaker around. These days I have settled for a pretty snug mount on thin-ish cork or thick-ish gasket paper.
Best regards,
Paul SRerurn to Romy the Cat's Site