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Songs that make your headphone WOOOOOW!!! - Page 257
Gear mentioned in this thread:post #3842 of 38445/21/15 at 6:12amQuote:Originally Posted by Aurthur
I kind of summed it up already, the pointing of a subwoofer down a long hallway to give the sound wave longer to travel, so the deepest notes can be heard. I don't have equipment to measure exactly how deep the note and its undertone/overtone series is, but I do know how deep my subs can respond, and that's 16Hz (the guy with the 16ft room's servo subs respond all the way down to 5Hz, where his pre-pro stops responding first). 16Hz requires 21.46 Meters (Calculation from http://www.sengpielaudio.com/calculator-waves.htm) to complete a wavelength. Therefore, to hear the tone without hearing what's left of it after decay and the likelihood of it running into itself on rebound (standing wave), I need to be standing or sitting at least that distance away from the source of the sound. That means I have to be standing or sitting 70 feet away for an unaltered 16Hz full wave to reach my ears.
So why is it I can hear it in the 16 foot room? Two reasons: his subs point only forward, mine have passive drivers on the side that are pressure-coupled to the primary driver. When I purchased them, that sounded like a really great idea - fill the room with bass. What I didn't realize is that I was also more than tripling the possibility for standing waves, which eats bass. Thus, more sound waves are completing in his room, even if they have to bounce a couple times to do it. Think dumping one rock in a puddle of water versus six. Which one gives you perfect ripples? The second reason is because his subs are larger. They move more air. They also respond equally well at 5Hz and 100Hz, because the servo has to complete the same amount of travel no matter how fast it's moving. Magnetic moving coil moves as far as it can given the amount of power, and as such, at lower power, moves less. Therefore, my subs do not respond with the same amount of volume or strength at 16Hz as they do at 20, 40, or 80. Finally, the ability for the servos to do that makes the walls shake in the room, making the note more noticeable.
None of this has anything to do with headphones, however. At least, not until someone comes up with a servo-driven headphone woofer.
@Aurthur, but can you then explain how we are able to hear frequencies from a headphone of <13.5kHz? 13.5kHz equals about 1 inch, so anything below that frequency, and thus with a greater wavelength, you would not be able to hear? Or would it be distorted? How does it work?
Not criticising btw, just genuinely curious.post #3843 of 38445/21/15 at 8:18am
The way I understand it (mind you, I'm not an acoustician or anyone in the science of such things, so take this as second hand knowledge), is that what we are actually hearing is primarily the overtone series (higher frequency complimentary sounds that virtually all sounds have), and/or the movement of the cone itself at extremely low frequencies. For example, if you play a 10Hz or 15Hz tone, it doesn't sound so much like music as it does a rapidly repeating tick or pop. Further, since we feel bass more than we hear it as human beings, what we are sometimes hearing is the resonance of our own body in reaction to the sound wave, which in turn, gives the sound wave an extra 10-12 feet to work with when piped in directly on the head.
That's the best answer I can give. That question has plagued me a bit as well, and these are the best answers I've found.
- Songs that make your headphone WOOOOOW!!!
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