Topic: Frequency range ?

[momule]

20Hz - 20kHz

30Hz - 20kHz

whats the diffrence? What should I be looking for . (think Mule taping)
 if this will help . Im running D-Mod UA5 also

[momule]

about 10hz

the closer to zero (hz), the lower you go. The higher the number (khz), the higher the freq.

I see,,, Thank's Moke

SO is 30 not really low enough to handle most Bass.

[Sean Gallemore]

in theory, 20hz is better.

can I listen to something and say, "oooh, this was recorded with a 30hz mic instead of one that extends down to 20hz." ?

not I

[Sean Gallemore]

about 10hz

the closer to zero (hz), the lower you go. The higher the number (khz), the higher the freq.

I see,,, Thank's Moke

SO is 30 not really low enough to handle most Bass.

Your "average" ear cuts out at around 38hz to 40hz, the rest is sub-sonic impact. Some of it is good, if done properly, or it can get boomy, and muddy, which is where we talk about hpf/bass roll off settings.

well said

[momule]

thank's guys for the input.

+ t ya both.

[Sean Gallemore]

thank's guys for the input.

+ t ya both.

thanx for my six hundred sixty-sixth ticket

[dklein]

Just to give you an idea, 20 Hz is what you feel when a big truck goes by down the road...or a subway underneath...you get the idea.  More feeling than hearing!

[Sean Gallemore]

Just to give you an idea, 20 Hz is what you feel when a big truck goes by down the road...or a subway underneath...you get the idea.  More feeling than hearing!

that's an awesome feel

[Brian]

you know if you play a 21Hz tone loud enough and with enough power it will loosen your sphinctor muscle and you'll have to immediately crap.

if you play a 9Hz tone loud enough and with enough power your brain will vibrate and explode

the first was proven by police in the early 1900's as a form of crowd control. too bad those idiots didn't know that low frequencies were omni-directional.  good ol cops

the second was apparantly proven back in the 1600's with the HUUUGGGE pipe organs in the big cathedrals.  i don't believe it necessarily but it's cool as hell to think about

just random latenight sub-sonic frequency ramblings

[yemncsu]

random latenight sub-sonic frequency ramblings

dude, that is a wicked awesome band name

Josh

[jpschust]

one thing you want to keep aware of, generally as your mics hit the ends of their ranges the fq response gets really shaky- the lower it goes, even if you cant hear it persay, not only will you feel it, but it will result in clearer response above that mark.  note- this is a huge generalization, but often times true.

[F.O.Bean]

what i never got was ppl saying that the schopes are muddy or whatever blah blah blah, but theyre freq response is only at 40hz, and akgs are 20-20k, along w/ alot of other mics!!

[Sean Gallemore]

what i never got was ppl saying that the schopes are muddy or whatever blah blah blah, but theyre freq response is only at 40hz, and akgs are 20-20k, along w/ alot of other mics!!

read jonny's post above

[BobW]

120 Hz is the sound of a loose ground at the speaker connection or on an analog RCA input.

A 4 string bass guitar's low note is E at 41 Hz
The 5 & 6 string basses have a low B checking in at 31 Hz

Kick drums can produce sounds as low as several hertz, depending on tuning and set-up.

Mic response curves and frequency specs. need to be taken with a grain or two of salt.

In the words of the sageous Moose, just listen !

[MattD]

Wouldn't that be 60 Hz (with 120 as the first harmonic)? AC power oscillates at 60 Hz, at least in the US.
-Matt

120 Hz is the sound of a loose ground at the speaker connection or on an analog RCA input.

[John Kelly]

you know if you play a 21Hz tone loud enough and with enough power it will loosen your sphinctor muscle and you'll have to immediately crap.

"You guys!  You guys!  I found the brown noise!"
/south park

[Chuck]

Like any technical specification, quoted frequency response has to have a quantifier:
ex. 20Hz - 20kHz +/- 2db
In this example the frequency response can wander up and down a total of 4 db.
So typically the response will be 2db down at the extremes of the frequency range on that microphone.

A spec: 20Hz to 20kHz is useless information unless the quantifier is included.

[BobW]

Wouldn't that be 60 Hz (with 120 as the first harmonic)? AC power oscillates at 60 Hz, at least in the US.
-Matt

120 Hz is the sound of a loose ground at the speaker connection or on an analog RCA input.

No, it's 120Hz.
The 60 HZ is doubled by the rectifier (heh-heh, he said rectifier...) in the power supply.
Even more confusing is the fact that we're used to hearing the 240Hz first harmonic through small speakers, which act like an HPF
and cut off the 120Hz...........

Great reminder on the A/C rumble. It is that season again.

+T to the thread ! 1000 posts !

[markgarrigan]

So what would this spec mean?

12dB per octave at 100 Hz

[nic]

So what would this spec mean?

12dB per octave at 100 Hz

I'm assuming this is for a HPF(bass rolloff). starting at 100Hz, the signal is attenuated 12db(steep curve) going down to 0Hz.
if for a LPF(high end rolloff), then it would attenuate the signal by the same curve but for frequencies above 100Hz, only allowing frequencies below 100Hz to pass

an electronics major can give you a more detailed explanation

[F.O.Bean]

pretty much nailed it on the head there bro, it attenuates all freq below/above a certain frequency

attenuates basically means 'kills'

[markgarrigan]

sorry...i guess i didn't post the whole spec...

Switchable Hi-pass Filter, 12dB per octave at 100 Hz

So is this as luvean said a LPF(high end rolloff)?

if it "kills" all freq above 100 Hz isn't that a bad thing.  Wouldn't you only get low end then.  since the range goes all the way to Khz.  Why would you turn this on?  Or is the key phrase "per octave"?  In whitch case i would need further explanation.

[nic]

"Switchable Hi-pass Filter, 12dB per octave at 100 Hz"

this means that signals below 100Hz are attenuated

[MattD]

To add to luvean's post, this means that at 50 Hz, the signal is 12 dB lower than it would have been without the filter and at 25 Hz, the signal is 24 dB lower than it would have been.

[nic]

To add to luvean's post, this means that at 50 Hz, the signal is 12 dB lower than it would have been without the filter and at 25 Hz, the signal is 24 dB lower than it would have been.

so in this case, 50Hz is 1 octave lower than 100Hz?
Iv'e never quite understood the whole "octave" part...

if the HPF was at 200Hz, would the first octave be at 100Hz?
guess what I'm asking is, what frequency(range) is considered an octave?

[MattD]

Any doubling/halving of frequency constitutes an octave. This is pretty easy to understand if you draw it. Draw a sine wave, then draw another one at 2x the frequency of that one. In this example, you'd fit 2 complete cycles of the higher frequency wave in one cycle of the lower frequency wave. The resulting notes are the same, one octave apart.

Octaves have no set range of frequencies. In lower notes, the difference between 40 and 80 Hz is an octave, but with higher notes, the difference between 1000 and 2000 Hz is an octave.

You're right with your HPF example there.

[Sean Gallemore]

high pass filter means the lows are cut, which means the highs pass through without being affected.

If the HPF is 100hz @ 12dB/oct. then the roll-off starts at 100 and theoretically at 50 hz (one octave down from 100) the signal should be 12 db lower and at 25hz (2 octaves down) the signal should be at 24dB.  The rating is just an estimate though because the actually roll-off is a curved slope, or maybe it's not and it just appears that way on paper