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 Now online (2)big dariusgriffin ...and 645 guests Last 5 registered Oplandisks nothingstar N_loop yipe foxtrotromeo Browse members... |
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eh.. ok.. I know what a frequency response-range is, but what does it mean when it, in the technical specs of a headset, says the following: Frequency response (headphones): 5.....40000 Hz (-10 dB) 10.....25000 (-3 dB) I've seen the -10 and -3 db thingies before, but only on mics, but I've never really figured out what it is for.. why would I want to take off 10 db on the mic when I can do it on the mixer? anyway.. why would I want to do it on a headset, and why is the frequency-range higher/wider if I do it? |
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-3dB is a corner freq. (i.e. F3 point of a xfer function) 1/sqrt(2) = .707 |
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thus, sine707 ;) |
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It's a touch difficult to explain, I'll try googlin' some better explanations and papers before I start typing up my notes....google links might be easier to understand than my scribbles. |
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cool, i would like to know too |
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possibly.. I don't get what you wrote AT ALL!!! remember: I am but a philosophy-student... equations and mathematical stuff flies in one ear, and falls out of my mouth as an existencial question... |
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i always imagined it had something to do with how steep the response 'falls off' on each end |
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as I said: 1/sqrt(2) = .707 ----> (my ear) ----> (mouth) ---> How come it is impossible for me to understand what another person is saying when he means the same thing as I do? Why does language interfer with thought if thought is the only free thing we still have? |
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-3dB is a corner freq. (i.e. F3 point of a xfer function) 1/sqrt(2) = .707 let's see, corner frequency, I don't know what that is. F3 point of a transfer function. well I don't know what an xfer function is, but F3 is the 3rd derivative?. I don't know what this .707 stuff is either. |
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it's quite possible that he's having a laugh... hahaha! |
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No. Give me some time (got a lot going on today )and I'll throw some explanations at you. I'll go dig up my notes when I get a chance here. It's quite difficult to explain if you're not familiar with circuit analysis and math. |
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Well how about this much: Which is better? -10 dB, or -3 dB? |
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ok.. I found something, but I'm not even sure I understand it correctly (it's in english, It's late here, and it's VERY hot here!). . The way I understand it from that article, the specs on those headphones mean that when the headphones play back frequencies within the 10 - 25 000 hz range, they play it back with -3 db, and when they play back sounds that exceed that range to the 5 and 40 000 hz range, they play the sounds back at -10 db... I could be wrong, though... |
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ok.. read it more closely.. it means that within the range of 5-40 000, every sound is played within a +/-10 decibel-range-thingie.. some sounds may be noticeably louder or quieter than other sounds at times... or something like that... eh..? I'm norwegian.. 28 degrees celsius fucks me up! ..or maybe I should eat something? |
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Just to know, the threshold of hearing is about 18-22000 hz, you won't be able to hear a perfect sine below 18hz with headphones, though you might be able to feel it with room speakers. Anyhow, those headphones sound pretty good, what are they? |
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Yeah.. In some cases people are able to pick up on sounds above or below that range, and it is an approximation, but it would only be useful with vinyl.. and since that's what I'm planning on using it for (it's a studio/dj headset) that's just perfect for me. |
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..and I still don't get what that switch on the microphone is for... |
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when on the subject do you own or have listened to akg k270 studio head phones I have read in hi-fi articles that thay should be good but i think they suck they have to little bass would someone recomend me to buy an headphone amplifier or do they suck |
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never tried them, but I'm checking into it now... |
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it seems that a amp is recommended to drive the bass, but I think you should just get new ones if you're not satisfied.. buy some that are more bass-heavy and still easy-driven... an amp is too expensive because you may not need it for future headsets, and thus it'll just collect dust in the future.. |
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human freq is 20hz - 20khz although only babies can hear that high ;) the older you get, the smaller the spectrum becomes. I cannot hear below 22-23Hz. I am quite sure most if not all can really hear 20KHz. |
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and that article is not what you are looking for. |
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are my assumptions based on that article correct, by the way? |
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ok. |
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It's not even close? |
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at work bump (for when i get home) |
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b-b-bump! |
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Ok...cutoff frequencies are essentially the freq. at which the transfer function drops in magnitude to 70.71% of its max value. this is also the freq at which power dissapted in a circuit is 1/2 of its max value. a cutoff or rolloff freq (F3 point in some loudspeaker terms, as i'm mostly talking circuit analysis) will show you on the plot of your xfer function where the freqs wlil be cut off. for example, a highpass filter is a filter designed to pass all freq. about its cutoff frequency. so this would be @ the 0.707 value on the plot of the transfer function |
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whether yuo will need all this info or not for buying headphones, is quite up to you. As I wouldn't expect or imagine anyone to just "walk into" this kind of information and understand it. |
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href="http://www.ece.unh.edu/courses/ece707_3/Docs/DSP/IIR/ now draw a horizontal line from the y-axis at the value 0.707 That will show you the cutoff frequency for the highpass filter. |
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usually, a waveform at +3dB is generally twice as "powerful".....but when it comes to humans it is more around +/- 10dB to become "twice as loud" to the human ears. |
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now with the tones and the +/- dB ratings, we could get into resonance and harmonics with that, but I don't believe that is necessary with digital equipment in this case. |
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oops, that link above was |
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Here is a bandpass filter. You can see that when 1/2 of the power is dissapated, that that is the 2 cutoff frequencies. In this case, with this bandpass filter, it will only pass frequencies in the f1 - f2 range, and bypass the rest. |
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hopefully tihs wil give u decent enuff explanation on what a cutoff freq is, the -3dB, and how it is related to freq. response / transfer function plot. |
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if you really want to start to understand this, BODE PLOTS are a must to understand. 20log(base 10) sqrt(2) = 3dB |
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whoah! I'll try to keep the existencial question out of this, but I don't think I understand it... soo... essentially, this means that while these headphones cut the frequencies outside of the 10 - 25000 hz range by 3db, they cut what is outside of the 5-44000hz area by 10db? |
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yes, because of the curve plot link to headphones? |
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Cool, I got the wireless RS65s and wired HD570. <3 my sennies. |
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although now I need a nice portable / compact set for my pocket pc (for mp3s and whatnot). My PPC doesn't have enuff juice to move the speakers on the HD570s. :( |
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yeah, sennheiser are fucking great! I've got some old, old ones (HD 480 II) from before, but I need some that are closed and that have more accurate sound-reproduction... that's why I thought a wider freq-range would be good (and I still haven't seen any headphones with wider range than 5-44000hz.. but.. since my ears won't be able to pick up on those frequencies, I don't get why they have such a wide range... anyway.. they seem good, and they fit the price-range I'd thought I'd use for headphones...) |
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..and the fact that they write two different freq-ranges in the specs also confused me.. therefore I asked here... |
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well they are two diff freq ranges showing you the dB loss at different points..... |
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yeah, I got that now, but at first it just confused me... I'd like to get some Electrostatic headphones, but for the price of such equipment I could just as well get my room plated with acoustic plates, buy that vestax vinyl-cutter, and start recording all my stuff directly to vinyl! |
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i want some wood speakers ;) |
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Short term, it's probably more useful for you to use a page like this that will let you plot the frequency response curves of most of the more popular mid to high fidelity headphones against each other to give you an idea of some of there characteristics. Oh, and I wouldn't expect closed headphones to give accurate sound reproduction (compared to opens) because of how much harmonic distortion occurs due to sound reflection inside the cups. And they all sound muffled anyways. Opens are the way to go for accurate sound reproduction. I recommend the Sennheiser HD600 or preferably the HD650 as it has smoother bass with out the infamous HD600 mid-bass hump. They are both headphones that will benefit from the use of a good class A amp as well. I can drive my HD600s directly from most sources (and that is the way they are designed to be used) but using an amp from line level output will give better sound as all but high end sources have shite amps. |
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Erm, try instead. |
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yeah, they're not for hi-fi listening.. they're for dj'ing/monitoring... and the specs say that relative harmonic distortion = 0,1% |
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yeah i would say you'd prolly want closed then. |
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