From: zekfrivo@zekfrivolous.com
In article <9N2dnagxG8OpNhrRnZ2dnUVZ_oadnZ2d@giganews.com>, "Bill Graham"
wrote:
>
>"AZ Nomad" wrote in message
>news:slrni8dr2q.i7p.aznomad.3@ip70-176-155-130.ph.ph.cox.net...
>> On Wed, 8 Sep 2010 11:38:32 +1000, Mr.T wrote:
>>
>>>I doubt you will find any stereo separation below 50Hz on any music CD
>>>either, and definitely not on any vinyl source. So there is no difference
>>>between twin mono (real) SUB woofers, and true stereo for all practical
>>>purposes anyway.
>>
>> Unless your room is at least 50' wide, it won't be heard in stereo.
>> Wavelength for a 50hz wave is 22'. Let it bounce off the near walls and
>> it will definately not be stereo by the time it reaches the listener.
>>
>> If you can hear where sound is coming from your subs, it is because of
>> harmonics above about 80-100hz.
>>
>>
>>
>
>Not sure how relevant this is to your discussion, but I play a trumpet, and
>I amplify my sound sometimes, so I can use special effects, and I have to
>cut off anything below about 100 Hz, in order to eliminate the valve clunk I
>get when my valves return to their highest, "relaxed" position.....There is
>a lot of low frequency noise in any recorded band. Not just valve "clunk",
>but guitar fretboard noise and other stuff like that.....I can get rid of
>most of it with a low cut filter, but not all of it.....
>
I used to try and play trumpet. You could cut it off way higher I'm sure.
I have in the past used signal generators and try to find how high before
localization occurs. 70 Hz and below is pretty safe. Even my cheap signal
generator has .5% distortion, but my old HP does way better. Any
little noise can be localized, especially woofer wind or basket noise.
greg
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