> Not so bad I guess :-) but did you actually try to hear sounds below 30Hz 
> with them?

Actually no. But the headphones certainly produce far more bass than my 
speakers do.

> Remember that the fundamental frequency of a 32' open pipe (or a 16' closed 
> one) is about 16Hz !

Doesn't necessarily mean the pipes generate any significant energy at 
their fundamental. ;-)

> Usually the very low frequency band is percieved more by chest and belly 
> than by ears
> Human ear is usually said to percieve sounds down to 20Hz and I suspect even 
> good headphones can't reproduce such low frequencies simply because their 
> resonance frequency is higher

By sound card, amplifier and headphones are all "rated" to do 20 Hz - 20 
kHz. Of course that only means the system has a meaningful amount of 
gain in that range; I'm sure frequencies outside it do register a little.

But clearly, no stereo system is likely to shake the building like a 
real pipe organ can - much to my neighbor's relief! ;-)

(BTW... if your headphones *have* a "resonant frequency", the designers 
did something wrong.)

> Do you want stops and manuals? 
> http://en.wikipedia.org/wiki/Image:Usnaconsole2.jpg

o_O

It looks like it would take 3 people to play it...!

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