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Yep - it’s wavelength related. At 40 Hz (low E), a wavelength is about 27 feet. If your woofers are a quarter of that or less from the floor, they are coupled well to it.
The frustrations of acoustics in any given room and my lack of any ability to control it drove me endlessly crazy. I rarely was comfortable, rarely heard myself properly, and frequently toasted the rest of the stage while not being able to hear myself. Too bad I never figured out my cabinets needed to be SIX FEET off the floor. At least they'd have been on access with my ears. No wonder guys flock to IEM's.
Or it may be a useful placement. It depends entirely on the situation. It doesn’t have to be mud.
"Mud" is usually not too much low frequency energy. If you have too much low end, eq can tame it most of the time. Mud is usually harmonics caused when you try to get low frequency energy out of a speaker that ca n't produce it, and it creates harmonics that are....not pleasant. Bass cabs can't really produce the lowest fundamentals, and they need HP filters to avoid creating those harmonics. I get to play through PA's that handle low frequency energy very well; extended low frequencies on a 5 in that situation are not at all "muddly", they are.....awesome.
The room modes, which can be particularly noticeable in a relatively small room, can also contribute to exaggerated peaks and valleys in the low end.
Well, guesses and sheepskins are fine; but, we used have a saying: Theory guides, Data decide.
www.bassgearmag.com
Sorry, I'm trying to take a look at this while monitoring 6th graders fixing a math quiz, and my head is spinning a bit with the calculations. To sum up, I'm guessing putting an am cabinet or combo amp on casters doesn't do much to reduce the sonic effects of floor coupling, it just makes the amp easier to move, right?Well, guesses and sheepskins are fine; but, we used have a saying: Theory guides, Data decide.
I “published” my experimental details and observations here:
(Submitted Article) – Bass Amplifier Isolation | Bass Gear Magazine
By P.H. TownsendTecPadz LLC Good Vibrations and Bass Vibrations Good vibrations. As bass players, we’ve all felt them. Bass notes and tones carry a lot of energy, due to the frequencies they inhabit. Physics. When you were young, your parents were yelling at you to, “turn that music down,”...
Please feel free to disprove those results or my conclusions.
What I did not describe in that article was the further response I observed when I repeatedly lifted the driver cabinet off of the stage plate while observing the sensor amplitude increase then decrease. At least seven or eight times. But, you can see the effect in the results shown in Table I, in which the coupling increases monotonically with the height of intended isolation device.
At which point, I was pretty much done with the work having mechanistically disproven that particular use of the device I had designed (and which I still use with trad amp heads).
But, what's your opinion on highland cows?
Don't blame the subwoofers, they aren't the problem.
Well, of course, it's the MISUSE of subwoofers that's the problem, but if they weren't there they couldn't be overboosted till everything sounds like that '93 Honda Civic - you know, the one with the 25 series tires sticking eight inches out past the fenders, the purple neon bulbs underneath, fart can, lots of stickers (cause stickers make a car faster!) and the wing on the trunk lid, still in the original black primer.
