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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: DC at output: Why is it bad, and how to check? posted by dave slagle on April 7, 2002 at 15:32:19:
so unless the driver is loaded in the same manner front and back, the air will introduce distortions...Uh, no, it won't. With respect to the asymmetrical nature of air, the driver is "loaded" simultaneously both front and back. In other words, you have compression on one side of the cone and rarefaction on the other side of the cone at the same time and the driver sees a singular linear load.
The asymmetrical nature of air is only of consequence with respect to wave propagation where compression and rarefaction occur at a given point in the medium at different times, not simultaneously.
I should also mention that while technically there is an asymmetrical nature to air, for all intents and purposes it's non-existent at sound pressure levels typical in audio reproduction. Several years ago I consulted a Ph.D. engineer on the subject and he pretty much summed it up with:
The only catch is that a sound level high enough to make
the non-linearity anything but totally insignificant would literally kill you before you could hear it.Of course one can always argue about what constitutes "totally insignificant" but the sound levels he was speaking of here were on the order of +/- 1 atmosphere, or about 194 dB, or in more realworld terms, the sound pressure produced by a Saturn V rocket at full throttle. Which is quite a few orders of magnitude greater than the threshold of pain, let alone typical listening levels so there's not a whole lot of room left to argue.
...and is it beyond the realm of reason to then wonder if possibly these distortions could be reduced by a slight offset of the normal null position of a driver???
It's beyond the realm of reason if your underlying premise is erroneous.
i can guess that the manufacturer of a driver has never considered this, because they have no idea how the driver is going to be implamented, and an infinate baffle would need a completely different design than a sealed box...
Why?
se
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Follow Ups
- Re: DC at output: Why is it bad, and how to check? - Steve Eddy 01:44:05 04/08/02 (0)
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