Talk:Subwoofer
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[edit] Crossover
What is "crossover" supposed to mean? It was a redirect to electronic filter, but most of the links were talking about chromosomes. -phma
The crossover is a filter which splits the signal into frequency bands, each band going to the apropiate speaker.
I don't agree with the following sentences:
"People who are accustomed to bass in home audio systems and car audio many times think that the subs in a concert PA system aren't putting out that much." More like I agree with the statement but i do not agree with the explination given in the article which is wrong.
First, if you look at the Fletcher and Munson equal loudness contours you'll see that the more the SPL rises, the bigger the low freq. sensation. So if you turn the volume up without altering the eq settings or without using a loudness control you'll notice that the bass becomes louder and louder, and if you turn down the volume, the bass starts to disappear.
Well PA systems are putting a lot more than home and car audio subs and with a lot LESS distortion. Cheap home/car audio systems are putting a lot of distortion into the sound which are mainly harmonics and intermodulation of it's poor transient responce. These are superior in frequency and if you take a look at the Fletcher and Munson contours you can understand why the distorted signal will sound much louder, although if you are to measure it with a SPL meter you'll get the same reading. For example a lot of people think that 50Hz it's not such a low frequency. That because if you put a 50Hz sine wave through a low quality system it will sound loud, more like a buzz than a hum ("hmmm"). And the more you turn up the volume the more the buzzier it gets due to amplifier clipping and driver distortion (which rises 8 times when doubling the power (due to electromagnetic non-liniarities) or more if we add excursion related problems, cone deformation, and others) Comming from a good system, 50Hz will not give much to the ears instead will give your body a massage if played loud enough and will move your furniture for free :)
PA systems are handled (or should be handled) by professionals who are doing their best and the systems will sound correctlly and well tonal balanced. That's why they do not appear so loud than a cheap boom-box with it's bassboost set to max and with it's speakers bottoming out at each bass note.
(sorry for my bad english)
[edit] Legal Issues
These are a pain in the *ss, and we need to say so (in an NPOV manner of course). Walls of houses and flats are not designed to block these sort of frequencies, and (in the UK at least) complaints about domestic noise are rising. -- Tarquin 17:47 Feb 15, 2003 (UTC)
- I hardly think the fact that some users of a piece of tech use it irresponsibly or in contradiction to local law is relevant. I'm sure that could be said of anything. Shall we add a note to the Automobile article that some people speed? Sapph 03:46, 20 April 2006 (UTC)
- In some cases, it's quite difficult to get full use out of a subwoofer without being 'irresponsible'. Because, as said, most places aren't designed to block such a mass volume of low frequency sound. And I have no fact, but in my experience, most people use subwoofer in contrast to law, rather than within the law. They just create a huge irritance to most anyone and everyone else in the vicinity. Peoplesunionpro 22:57, 20 December 2006 (UTC)
[edit] Article clean up
I tried to clean up some of the writing in this article, but it seems a little unfinished. Should it be marked for revision to conform to the almighty higher quality standards?
Specifically, the equations in the last paragraph needs to be formatted. Thanks to all those who contribute to the page. =) Dept of Alchemy 06:03, 2 May 2006 (UTC)
[edit] citing
Many speakers were capable of emitting subsonic sounds or were powerful bass drivers before the 1970s, like Cerwin Vega in the 1950s. Citation is needed.RCHM 01:43, 10 October 2006 (UTC)
[edit] This article needs help
This article needs to be rewritten becuase of the non factual common audio misconceptions about subwoofers. A good example is woofer speed directly linked to cone weight. This is untrue and is related to the inductance of the coil. See bellow link. http://www.adireaudio.com/Files/TechPapers/WooferSpeed.pdf
Suspension non linearities with Square cones are not a big factor in distortion, the reason is they reinforced the corners is because of the sorround tearing.
There is more I just have to read it again. —The preceding unsigned comment was added by 216.98.239.15 (talk) 20:38, 10 December 2006 (UTC).
