so whats the deal with Fs?

[PioneerSPL1990 10+ year member]

Next question : then why do most online box designers not take in some of these important factors when designing, and if there is one that does, does someone have the link?

 

[newusername 10+ year member]

It's used to block out frequencies from being played that us humans cannot hear. Usually below 20hz. And frequencies that can potentially damage the sub/subs.

Why would a sub-sonic filter work at low frequencies and not higher frequencies?

 

[GregU 10+ year member]

Why would a sub-sonic filter work at low frequencies and not higher frequencies?

Because sub-sonic means below hearing....... same thing as infrasonic.

Ultrasonic means it's above hearing.

EDIT: To answer the other part of your question, they are used on class D amps/sub amps. Class D amps are used for subs, since the turning on and off of the amp causes distortion but not audiable in the low range frequency. That's why a lot of four channel amps are class A/B. There's also class B/D and a couple other but I'm not familiar with them.

 

[newusername 10+ year member]

Sub-sonic does not mean "below hearing". Where did you get that definition?

Infrasonic means below 20 Hz. Ultrasonic means above 20 kHz.

 

[Papermaker85 5,000+ posts]

first off most people think that 20hz down cannot be heard, it can...

the filter is called sub-sonic because its used to filter low frequencies that can damage the woofer and that are normally not part of the actual recording... a-lot of times you get its from compressing files and just bad recordings..

FS is more of the "outcome" of the drivers design.. its has to do with mass, compliance and dampning. not very often do you want to tune below FS. usually the lowest i tune is 30-32hz depending on the driver...Qes also affects HOW the driver reacts under FS and well as over FS... without getting into too much detail just remember that many many recordings never go lower than 35hz.. and very few go down to 30hz. so its safe to say that 30 hz is the lowest tuning for musical applications... its a good mix of low end extention and output...

 

[groundpound4200 5,000+ posts]

ohhh man..... //content.invisioncic.com/y282845/emoticons/popcorn.gif.32dd9e22fd77e77bc3c907062768fcd2.gif

 

[dman4486 5,000+ posts]

first off most people think that 20hz down cannot be heard, it can...

wrong. the typical audible range for the human ear is from 20hz-20khz

 

[newusername 10+ year member]

I don't mean to come off rude; I'm just trying to promote a little inquisitive thinking. What is the definition of subsonic, and what relevance does it have to a high-pass filter?

 

[Bassman999 10+ year member]

Next question : then why do most online box designers not take in some of these important factors when designing, and if there is one that does, does someone have the link?

Online box sellers just make a box plain and simple. The masses will believe that if the sub fits in the hole then I should buy it if its pretty. For the rest of us who want a sub to sound the way it was designed, we build a box based on the actual paramaters of the sub(s) we actually have.

 

[GregU 10+ year member]

Sub-sonic does not mean "below hearing". Where did you get that definition?
Infrasonic means below 20 Hz. Ultrasonic means above 20 kHz.

::sigh::

As I stated before, sub-sonic = below audiable. Ultrasonic = above audiable. Audiable = 20hz-20Khz.

Hearing = Audiable

This "should" be common knowledge, nothing special.

 

[GregU 10+ year member]

so its safe to say that 30 hz is the lowest tuning for musical applications...

Really?

That's wrong on so many different levels......what about SQ? Your telling me for SQ applications that I should never tune below 30Hz? Besides that, tuning vary's with different subs.....

 

[bass_lover1 10+ year member]

You guys are so funny.

First, tweeters aren't run free air, the majority of them are chambered dingbats...

Second, Sub-sonic IS NOT and will NEVER be sound not audible to the human ear. Think fighter jets and Mach 1, then give it some more thought, and you'll realize you're all idiots, ok except Neil.

That's all I got for now, that is of course until one of you thinks of something else "intelligent" to spew forth from your keyboard.

 

[dman4486 5,000+ posts]

You guys are so funny.
First, tweeters aren't run free air, the majority of them are chambered dingbats...

Second, Sub-sonic IS NOT and will NEVER be sound not audible to the human ear. Think fighter jets and Mach 1, then give it some more thought, and you'll realize you're all idiots, ok except Neil.

That's all I got for now, that is of course until one of you thinks of something else "intelligent" to spew forth from your keyboard.

that is super-sonic id10t

 

[newusername 10+ year member]

that is super-sonic id10t

I wonder what the opposite of super-sonic is.

 

[Papermaker85 5,000+ posts]

wrong. the typical audible range for the human ear is from 20hz-20khz

OK im def talking outta my ***... if you do some research people have heard as low as 3hz.. in paticular a space shuttle launch is audible, measured 3 cycles at 202db if i remember correctly... another time is reports from several 100s people complaining of very low frequency sounds causing them to be unable to sleep... i don't recall where, but if you watch discovery and the mitillary channel you will probably see the eposide.. third i have built transimission lines with extreme low frequecy output and extention.. more felt than heard but down to around 18hz it was definitally audible... just like any other transducer your hearing has a roll off... you might have a 50db slope that starts @ 25... someone elses might vary slightly...