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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Question about bass frequency posted by ecl876 on January 10, 2015 at 17:11:20:
Well, they used a slightly different driver, or a slightly different box tuning (or both). And the reality is that your room geometry and relative placement of the speakers will make the biggest difference in over-all low frequency response.But, if the woofer is different, there could be other sonic changes (higher up) that will change the flavor of the sound. There is more to drivers than just frequency response - the distortion spectrum and break-up patterns of drivers is a very important part of a speakers final sound, or what many refer to as "tonal balance".
Besides, the -29 versus -26 rating... that is usually a -3db or -6db level, associated with the speakers "cut off" frequency.
Things like motor design (parameters like xmax, and suspension linearity) show up on Klippel charts, which indicate how linear a low frequency reproducer behaves. Typically, things get worse as you move the cone towards it's excursion limits. Good drivers demonstrate more linear behavior - that's magnetics stuff. Then you have airflow, suspension components... how noisey is this thing? Does it create a buch of huffing and chuffing down in sub frequencies? A six inch woofer can put out the same SPL as a 12 inch woofer at 60Hz. How? It needs to move the same amount of air - and with the smaller cone area, it needs a longer stroke to make up for it. That can't take longer, or else you'll get a pitch change - so what has to happen? The little driver will require a faster cone speed at 60Hz for the same SPL as a larger woofer at the same frequency! Imagine that - two woofers operating at the same frequency with different cone speeds. Counter-intuitive, isn't it!
That's why small ports in ported boxes are more prone to "chuffing" (port noise) than larger ports - it's because a larger port, for a given tuning frequency, has a lower air speed (mach number).
At the end of the day, when you get down below 40Hz, there is a point where a properly integrated sub system *can and will* out-peform what a floor stander can do alone. I use a sub with almost all systems I have at home, even ported. There is one system where I occasionally leave the sub off - the system with a 12" Focal woofer (ported) on each side. Even then, for material with super-intense sub signals in it, the difference a sub makes is appreciable even with the larger woofers. It has more to do with placement at that point than displacement.
Check out this Scan Speak "Illuminator" driver... notice how much engineering has gone into making the moving parts "open" and not constricted, to absolutely minimize interference as this thing moves. Fantastic!
Cheers,
Presto
Edits: 01/14/15
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- RE: Question about bass frequency - Presto 08:14:07 01/14/15 (0)
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