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Help with wiring colors on old headphones
In article ,
Martin Brown wrote: On this topic did anyone else see the NHK broadcast a few months back about a digital version of binaural recording that alters the phase frequency response of the high end of close miked material to extend the stereo sound stage vertically. The trick works by tweaking the frequency phase relationship to match what the ear expects from a wave incident at a given angle. Not new, IIRC. I remember hearing a binaural recording of a man being shaved and having a haircut. Could just about feel the comb on the head. -- *I'm not your type. I'm not inflatable. Dave Plowman London SW To e-mail, change noise into sound. |
Help with wiring colors on old headphones
On 16/05/2011 13:30, Dave Plowman (News) wrote:
In , Martin wrote: On this topic did anyone else see the NHK broadcast a few months back about a digital version of binaural recording that alters the phase frequency response of the high end of close miked material to extend the stereo sound stage vertically. The trick works by tweaking the frequency phase relationship to match what the ear expects from a wave incident at a given angle. Not new, IIRC. I remember hearing a binaural recording of a man being shaved and having a haircut. Could just about feel the comb on the head. What was new was that they could take close miked material and use digital processing to move it around the binaural sound stage at will. The old way involved microphones inside a headlike dummy with ears. Regards, Martin Brown |
Help with wiring colors on old headphones
In article ,
Martin Brown wrote: On 16/05/2011 13:30, Dave Plowman (News) wrote: In , Martin wrote: On this topic did anyone else see the NHK broadcast a few months back about a digital version of binaural recording that alters the phase frequency response of the high end of close miked material to extend the stereo sound stage vertically. The trick works by tweaking the frequency phase relationship to match what the ear expects from a wave incident at a given angle. Not new, IIRC. I remember hearing a binaural recording of a man being shaved and having a haircut. Could just about feel the comb on the head. What was new was that they could take close miked material and use digital processing to move it around the binaural sound stage at will. Right. The old way involved microphones inside a headlike dummy with ears. Seems to have gone out of fashion. R4 used to have the odd play recorded dummy head - but not recently. -- *Gun Control: Use both hands. Dave Plowman London SW To e-mail, change noise into sound. |
Help with wiring colors on old headphones
"Ian Jackson"
wrote in message ... I find that reversing the phase of one of the headphones produces a much wider audio image, and is generally much easier to listen to. I can only hope that the purists will forgive me. The late J Gordon Holt described the effect (for him) as cleaning out everything inside his end. How bothered you are by it depends on how sensitive you are to "phasiness". There is nothing wrong with listening to mono with reverse polarity. But if you listen to stereo that way -- you will, indeed, have the purists down on you. |
Help with wiring colors on old headphones
"Phil Allison" wrote in message
... "Ian Jackson" I find that reversing the phase of one of the headphones produces a much wider audio image, and is generally much easier to listen to. I can only hope that the purists will forgive me. ** All you have to do is un-link the common ground -- it leaves the two transducers in series and out of phase. If the signal is mono, you'll have pretty much nothing left to listen to. If it's stereo, the mono components will be cancelled, the L- and R-only components retained, with components in-between subjected to varying degrees of attenuation. And, yes, Phil, whether or not you like it, what I've just said is 100% correct. |
Help with wiring colors on old headphones
"Patrick" wrote in message ... I have some vinatge headphones (Sennheiser HD424) and want to attach a new plug. Which color wires are the positive ones? The colors in one of the leads are red & blue and in the other lead black & yellow. (No wire is used as screening - there's just two wires in each lead.) You've certainly set the cat amongst the pidgeons. It's getting right leary in here. So a search topic for you: How do barn owls locate prey just by listening? Once you've done a search on that relevant subject: Spatial hearing (a collection of files to enjoy) https://mustelid.physiol.ox.ac.uk/dr...patial_hearing Acoustic Holography (A bit of engineering) http://www.lmsintl.com/acoustic-holography Now some more subjects for you to type into the search engine of your choice: Psychoacoustics Cochlear nuclei Neural action potentials. Auditory masking Missing fundamental Hypersonic effect Diana Deutsch Dr. Daniel J. Levitin Sound localization by the human auditory system Lateral information Interaural time differences Phase delays Group delays Parallel processing pathways in the brain Axons of the auditory nerve I'll check back in a week or so. PS. Ever heard of Q-Sound? |
Help with wiring colors on old headphones
On 05/14/2011 05:31 PM, Phil Allison wrote:
"Tim Wescott" "If the click seems to come from right inside your head - game over". What more do you need? Phil's given you a test to see if the phasing is correct, can you not figure it out, or what to do if the click seems to come from your right or your left? ** If both ear phones work but are wired out of phase, the AA cell click test produces a sound that seems to be originating outside the head on both sides. Mono speech or music sounds much the same. The effect is far MORE pronounced than with typical stereo speakers in a room. The OP demonstrates his a monumental ignorance of headphones, hi-fi sound, usenet etiquette and common sense. Only tangentially related, and mostly useless: Amateur radio folks like building direct conversion receivers (i.e., mix down to baseband). They're simple, hence little, and they work pretty well. Their biggest problem is that they have no audio image rejection at all -- listening with a 7040kHz oscillator, you'll hear a signal at 7040.5 just the same as one at 7039.5. You can get around this by making a so-called "phasing" receiver (basically an image-reject downconverter, but ham radio has its own terminology), but then you're back to something complex. If you build an I/Q downconverter, and amplify each channel to a headphone channel, then apparently you get a spatial perception of the tones -- upper side tones sound like they're coming from a different point in space than lower side tones, and (presumably due to the phase shift in the amplifiers, I don't know) high and low tones do as well. It's claimed that this makes it easier to use for morse code reception. I've always thought that was interesting, but haven't tried it. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html |
Help with wiring colors on old headphones
On May 16, 2:38*pm, "FedUpLurker" wrote:
"Patrick" wrote in message ... I have some vinatge headphones (Sennheiser HD424) and want to attach a new plug. Which color wires are the positive ones? The colors in one of the leads are red & blue and in the other lead black & yellow. *(No wire is used as screening - there's just two wires in each lead.) You've certainly set the cat amongst the pidgeons. It's getting right leary in here. So a search topic for you: How do barn owls locate prey just by listening? Once you've done a search on that relevant subject: Spatial hearing (a collection of files to enjoy)https://mustelid.physiol.ox.ac.uk/dr...patial_hearing Acoustic Holography (A bit of engineering)http://www.lmsintl.com/acoustic-holography Now some more subjects for you to type into the search engine of your choice: Psychoacoustics Cochlear nuclei Neural action potentials. Auditory masking Missing fundamental Hypersonic effect Diana Deutsch Dr. Daniel J. Levitin Sound localization by the human auditory system Lateral information Interaural time differences Phase delays Group delays Parallel processing pathways in the brain Axons of the auditory nerve I'll check back in a week or so. PS. Ever heard of Q-Sound? Learn a bit about Kemar Manikin he http://www.eartunes.com/if/audiology-inf-107.shtml |
Help with wiring colors on old headphones
Tim Wescott wrote:
On 05/14/2011 05:31 PM, Phil Allison wrote: "Tim Wescott" "If the click seems to come from right inside your head - game over". What more do you need? Phil's given you a test to see if the phasing is correct, can you not figure it out, or what to do if the click seems to come from your right or your left? ** If both ear phones work but are wired out of phase, the AA cell click test produces a sound that seems to be originating outside the head on both sides. Mono speech or music sounds much the same. The effect is far MORE pronounced than with typical stereo speakers in a room. The OP demonstrates his a monumental ignorance of headphones, hi-fi sound, usenet etiquette and common sense. Only tangentially related, and mostly useless: Amateur radio folks like building direct conversion receivers (i.e., mix down to baseband). They're simple, hence little, and they work pretty well. Their biggest problem is that they have no audio image rejection at all -- listening with a 7040kHz oscillator, you'll hear a signal at 7040.5 just the same as one at 7039.5. That's the _second_ biggest problem - the biggest is that they're an unlicensed transmitter. Hope This Helps! Rich |
Help with wiring colors on old headphones
"Rich Grise" Tim Wescott wrote: Amateur radio folks like building direct conversion receivers (i.e., mix down to baseband). They're simple, hence little, and they work pretty well. Their biggest problem is that they have no audio image rejection at all -- listening with a 7040kHz oscillator, you'll hear a signal at 7040.5 just the same as one at 7039.5. That's the _second_ biggest problem - the biggest is that they're an unlicensed transmitter. ** Giant HUH ?? Ham radio operators are * licensed * uses of the band from 7MHz to 7.3 Hz - aka the 40 metre band. In an case, spurious emissions from a flea powered local oscillator is not a transmitter requiring a licence. Wot a jerkoff. ...... Phil |
Help with wiring colors on old headphones
On 5/16/2011 10:17 PM, Rich Grise wrote:
Tim Wescott wrote: On 05/14/2011 05:31 PM, Phil Allison wrote: "Tim Wescott" "If the click seems to come from right inside your head - game over". What more do you need? Phil's given you a test to see if the phasing is correct, can you not figure it out, or what to do if the click seems to come from your right or your left? ** If both ear phones work but are wired out of phase, the AA cell click test produces a sound that seems to be originating outside the head on both sides. Mono speech or music sounds much the same. The effect is far MORE pronounced than with typical stereo speakers in a room. The OP demonstrates his a monumental ignorance of headphones, hi-fi sound, usenet etiquette and common sense. Only tangentially related, and mostly useless: Amateur radio folks like building direct conversion receivers (i.e., mix down to baseband). They're simple, hence little, and they work pretty well. Their biggest problem is that they have no audio image rejection at all -- listening with a 7040kHz oscillator, you'll hear a signal at 7040.5 just the same as one at 7039.5. That's the _second_ biggest problem - the biggest is that they're an unlicensed transmitter. Hope This Helps! Rich No, it doesn't help and is misleading, Rich. 7040kHz is an amateur frequency. So, it is legal for "Amateur radio folks" as Tim indicated. John |
Help with wiring colors on old headphones
In message , John KD5YI
writes On 5/16/2011 10:17 PM, Rich Grise wrote: Tim Wescott wrote: On 05/14/2011 05:31 PM, Phil Allison wrote: "Tim Wescott" "If the click seems to come from right inside your head - game over". What more do you need? Phil's given you a test to see if the phasing is correct, can you not figure it out, or what to do if the click seems to come from your right or your left? ** If both ear phones work but are wired out of phase, the AA cell click test produces a sound that seems to be originating outside the head on both sides. Mono speech or music sounds much the same. The effect is far MORE pronounced than with typical stereo speakers in a room. The OP demonstrates his a monumental ignorance of headphones, hi-fi sound, usenet etiquette and common sense. Only tangentially related, and mostly useless: Amateur radio folks like building direct conversion receivers (i.e., mix down to baseband). They're simple, hence little, and they work pretty well. Their biggest problem is that they have no audio image rejection at all -- listening with a 7040kHz oscillator, you'll hear a signal at 7040.5 just the same as one at 7039.5. That's the _second_ biggest problem - the biggest is that they're an unlicensed transmitter. Hope This Helps! Rich No, it doesn't help and is misleading, Rich. 7040kHz is an amateur frequency. So, it is legal for "Amateur radio folks" as Tim indicated. Even licensed radio amateurs don't want the local oscillator of a direct-conversion receiver to radiated. The design of the receiver usually ensures that any radiation is negligible. Many people don't realise that any superheterodyne receiver is potentially capable of radiating. Just try listening to the same station on two cheap FM receivers in the same room, and you'll probably see what I mean. -- Ian |
Help with wiring colors on old headphones
In message nc, Paul
Hovnanian P.E. writes Patrick wrote: I have some vinatge headphones (Sennheiser HD424) and want to attach a new plug. Which color wires are the positive ones? The colors in one of the leads are red & blue and in the other lead black & yellow. (No wire is used as screening - there's just two wires in each lead.) If they are the standard voice coil types, put them in front of a stereo speaker and drive the amp with a sine wave. The headphone 'speakers' will act as microphones. Use an oscilloscope on the pairs of leads to determine phasing. Is there going to be a prize for suggesting the most obscure (but effective) way of determining the phasing? -- Ian |
Help with wiring colors on old headphones
On Mon, 16 May 2011 11:46:54 +0100, Martin Brown
wrote: On this topic did anyone else see the NHK broadcast a few months back about a digital version of binaural recording that alters the phase frequency response of the high end of close miked material to extend the stereo sound stage vertically. The trick works by tweaking the frequency phase relationship to match what the ear expects from a wave incident at a given angle. It just sounded odd on loudspeakers. Was this some kind of dummy head recording or some kind of ambisonics (Gerzon) WXYZ recording ? |
Help with wiring colors on old headphones
On Sun, 15 May 2011 10:31:35 +1000, "Phil Allison"
wrote: ** If both ear phones work but are wired out of phase, the AA cell click test produces a sound that seems to be originating outside the head on both sides. Mono speech or music sounds much the same. The effect is far MORE pronounced than with typical stereo speakers in a room. Puking two speakers with front panels against each other is a quite easy way to check polarity. If the polarity is correct, you will hear some low frequency sounds emitted from the combination. If the polarity is wrong, you will hear only mid- and high pitch sounds, since the low frequency air is moving between the cones of the speakers. With headphones, you either get "in head" or unrealistic sound depending on the phasing of headphones. Sennheiser did the wiring correctly by keeping all four wires separate and connected to a 4 pin DIN plug and by adding a 4 pin DIN to 6.35 mm plug adaptor. As a kid, I was really ****ed of by the convention of using common returns in headphones. I was testing frequency diversity reception of the same broadcast programs on two different shortwave bands with two receivers. Unfortunately, the other receiver was of AC/DC type with the full 220 Vac in the chassis. Thus I had to rewire the phones so that one side could (potentially) siting on 220 Vac, and the other side sitting close to ground potential. After this alteration, I had no problems with this arrangement. No problems, no problems, no problems :-) |
Help with wiring colors on old headphones
|
Help with wiring colors on old headphones
"Ian Jackson" Is there going to be a prize for suggesting the most obscure (but effective) way of determining the phasing? ** I got one: Insert a pin through a hole in the earphone grille and let it rest loosely the diaphragm. Use the AA cell test. One polarity will evict the pin. ..... Phil |
Help with wiring colors on old headphones
In message , Phil Allison
writes "Ian Jackson" Is there going to be a prize for suggesting the most obscure (but effective) way of determining the phasing? ** I got one: Insert a pin through a hole in the earphone grille and let it rest loosely the diaphragm. Use the AA cell test. One polarity will evict the pin. I reckon that one's certainly for the shortlist for the prize. Of course, the principle is not new. You can test loudspeakers with a battery, and watch which way the cone kicks. That would be difficult to do with headphones, and 'kicking the pin out' overcomes this problem. -- Ian |
Help with wiring colors on old headphones
"Rich Grise" wrote in message
Tim Wescott wrote: On 05/14/2011 05:31 PM, Phil Allison wrote: "Tim Wescott" "If the click seems to come from right inside your head - game over". What more do you need? Phil's given you a test to see if the phasing is correct, can you not figure it out, or what to do if the click seems to come from your right or your left? ** If both ear phones work but are wired out of phase, the AA cell click test produces a sound that seems to be originating outside the head on both sides. Mono speech or music sounds much the same. The effect is far MORE pronounced than with typical stereo speakers in a room. The OP demonstrates his a monumental ignorance of headphones, hi-fi sound, usenet etiquette and common sense. Only tangentially related, and mostly useless: Amateur radio folks like building direct conversion receivers (i.e., mix down to baseband). They're simple, hence little, and they work pretty well. Their biggest problem is that they have no audio image rejection at all -- listening with a 7040kHz oscillator, you'll hear a signal at 7040.5 just the same as one at 7039.5. That's the _second_ biggest problem - the biggest is that they're an unlicensed transmitter. Only if badly designed. Ever hear of balanced mixers? |
Help with wiring colors on old headphones
On Tue, 17 May 2011 08:17:49 +0100, Ian Jackson
wrote: Is there going to be a prize for suggesting the most obscure (but effective) way of determining the phasing? Plug in both earphones or speakers with random wiring and play something in stereo. If it sounds right, you're done. If the orchestra sounds like a ping pong game, switch polarity on one earphone or speaker. If you can't tell the difference, replace the listener and try again. I hate to admit it, but I've done it this way a few times. I'll accept my price in US dollars. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
Help with wiring colors on old headphones
"Jeff Liebermann" wrote in message
... On Tue, 17 May 2011 08:17:49 +0100, Ian Jackson wrote: Is there going to be a prize for suggesting the most obscure (but effective) way of determining the phasing? Plug in both earphones or speakers with random wiring and play something in stereo. If it sounds right, you're done. If the orchestra sounds like a ping pong game, switch polarity on one earphone or speaker. If you can't tell the difference, replace the listener and try again. I hate to admit it, but I've done it this way a few times. I'll accept my price in US dollars. I'm reminded of a 52-year-old article in "Popular Electronics" about building your own stereo headphones. After assembling them and putting them on, you were instructed to phase one driver for the best bass. Incredible. |
Help with wiring colors on old headphones
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Help with wiring colors on old headphones
On Sat, 14 May 2011 08:19:58 -0700 (PDT), spamtrap1888
wrote: Did anyone ever come up with muffs better than the OEM crap for these? Search Google for "disposable headphone covers". Something like these: http://www.scansound.com/headphone-covers.htm (towards bottom of page). Pack them with something soft (foam, tissue paper, rolled cloth, old rags, etc) and place them over your headphones. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
Help with wiring colors on old headphones
On Tue, 17 May 2011 08:27:28 -0700, Jeff Liebermann
wrote: On Sat, 14 May 2011 08:19:58 -0700 (PDT), spamtrap1888 wrote: Did anyone ever come up with muffs better than the OEM crap for these? Search Google for "disposable headphone covers". Something like these: http://www.scansound.com/headphone-covers.htm (towards bottom of page). Pack them with something soft (foam, tissue paper, rolled cloth, old rags, etc) and place them over your headphones. Or, if you're into crochet, you can knit your own: http://myplasticfreelife.com/2011/04/crochet-your-own-plastic-free-headphone-ear-pads/ http://www.craftbits.com/project/crochet-headphone-covers http://blog.sewhooked.org/2008/10/29/crochet-headphone-covers-revisisted/ If not, try old socks: http://www.instructables.com/id/Sockophones-earphone-padding-made-from-socks/ Full disclosu I haven't tried any of the above, but have made some covers from cloth, elastic, some foam, and with a serger. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
Ain't he just MORONIC !!
On Mon, 16 May 2011 11:24:40 +1000, Phil Allison wrote:
"Meat Plow" ** This ****WIT troll needs to be kicked off usenet. Who will help ? Please make your complaints to and forward the offensive posts along with full headers. Have a rotten day Phil. -- Live Fast Die Young, Leave A Pretty Corpse |
Ain't it just amazing !!
On Sun, 15 May 2011 20:28:54 -0400, Jamie wrote:
Meat Plow wrote: On Sun, 15 May 2011 17:37:16 +1000, Phil Allison wrote: "William Sommer******" "Meat Plow" ** This trolling asshole is a narcissistic psychopath. He knows nothing and understands even less. I want the lunatic jerk kicked right off usenet. Who will help me ? If the "lunatic jerk" you're referring to is yourself... I'd say everyone in this group. ** Ain't it just amazing !! If you go after ONE troll, the rest of the ****s come in and gang up on you. So you gotta take the WHOLE lot on, all at once. What a bunch of gutless, fascist pricks they are. You don't have what it takes to take on me. I rip you apart anytime you fly off the handle with your vulgar, threatening reply traps. You are the epitome of the word Troll. Fighting a battle of wits does not help you much, especially when your aponent is unarmed! Jamie I don't consider this a fight or battle. If it offends you simply ignore my posts. -- Live Fast Die Young, Leave A Pretty Corpse |
Allison needs help kicking Meat Plow off Usenet
On Mon, 16 May 2011 03:13:29 -0400, Michael A. Terrell wrote:
Phil Allison wrote: "Meat Plow" ** This ****WIT troll needs to be kicked off usenet. Who will help ? No one will lift a finger to help you, Phyllis. I will. Phil, just forward my posts to with complete headers. That's really all you can do unless you plan a trip to Ohio to blow my brains out. Here's some friendly advise, buy a one way ticket. -- Live Fast Die Young, Leave A Pretty Corpse |
Help with wiring colors on old headphones
On Tue, 17 May 2011 08:12:37 -0700, Jeff Liebermann wrote:
On Tue, 17 May 2011 08:17:49 +0100, Ian Jackson wrote: Is there going to be a prize for suggesting the most obscure (but effective) way of determining the phasing? Plug in both earphones or speakers with random wiring and play something in stereo. If it sounds right, you're done. If the orchestra sounds like a ping pong game, switch polarity on one earphone or speaker. If you can't tell the difference, replace the listener and try again. I hate to admit it, but I've done it this way a few times. I'll accept my price in US dollars. If you can actually see the driver diaphragm hook up a AAA cell to the leads coming from the drive and watch the motion. No different than phasing regular speakers. -- Live Fast Die Young, Leave A Pretty Corpse |
Wacko TROLL must leave
On Mon, 16 May 2011 11:26:18 +1000, Phil Allison wrote:
"Meat Plow" ** This ****WIT troll needs to be kicked off usenet. Who will help ? ..... Phil For the fifth time, send email with headers of my posts you find offensive to . I'll be happy to help you get me kicked off Usenet Phil. -- Live Fast Die Young, Leave A Pretty Corpse |
Allison needs help kicking Meat Plow off Usenet
On Tue, 17 May 2011 23:07:00 +0000 (UTC), Meat Plow
wrote: On Mon, 16 May 2011 03:13:29 -0400, Michael A. Terrell wrote: Phil Allison wrote: "Meat Plow" ** This ****WIT troll needs to be kicked off usenet. Who will help ? No one will lift a finger to help you, Phyllis. I will. Phil, just forward my posts to with complete headers. That's really all you can do unless you plan a trip to Ohio to blow my brains out. Here's some friendly advise, buy a one way ticket. --- Why do you want to take a sad song and not make it better? Phil's not so bad, he just has zero tolerance for bull**** and responds vehemently when he sees it. What's wrong with that? -- JF |
Help with wiring colors on old headphones
"Ian Jackson" Phil Allison Is there going to be a prize for suggesting the most obscure (but effective) way of determining the phasing? ** I got one: Insert a pin through a hole in the earphone grille and let it rest loosely the diaphragm. Use the AA cell test. One polarity will evict the pin. I reckon that one's certainly for the shortlist for the prize. ** On reflection - it might be better to use a tooth pick. A pin may well be attracted by the magnet. Of course, the principle is not new. You can test loudspeakers with a battery, and watch which way the cone kicks. That would be difficult to do with headphones, and 'kicking the pin out' overcomes this problem. ** Interesting fact: Testing a ( moving coil) driver with a battery establishes a polarity that is the reverse of the "real" one during normal operation. The *actual cone motion* in response to alternating current drive (within a driver's operating band) involves a double integration of the current ave - hence a 180 degree phase shift. The same fact also means that a cone reproducing a square wave ( within it's operating band ) follows a motion very close to that when reproducing a sine wave at the same fundamental frequency. IOW the third and higher order odd harmonics of the square wave cause very little actual cone motion. Bet anything this starts an argument. .... Phil |
Allison needs help kicking Meat Plow off Usenet
"John Fields" ** Do you know what " meat plow " refers to ? ..... Phil |
Allison needs help kicking Meat Plow off Usenet
On Wed, 18 May 2011 20:30:08 +1000, the renowned "Phil Allison"
wrote: "John Fields" ** Do you know what " meat plow " refers to ? Something that furrow one's brow? Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |
Allison needs help kicking Meat Plow off Usenet
"Spehro Pefhany" ** Do you know what " meat plow " refers to ? Something that furrow one's brow? ** Not really. Look it up. |
Help with wiring colors on old headphones
** Interesting fact:
Testing a ( moving coil) driver with a battery establishes a polarity that is the reverse of the "real" one during normal operation. The *actual cone motion* in response to alternating current drive (within a driver's operating band) involves a double integration of the current ave [???] -- hence a 180 degree phase shift. The same fact also means that a cone reproducing a square wave (within it's operating band ) follows a motion very close to that when reproducing a sine wave at the same fundamental frequency. IOW the third and higher order odd harmonics of the square wave cause very little actual cone motion. Bet anything this starts an argument. There's no argument. As a degreed EE, I'm reasonably certain everything Mr Clavin here has said is either wrong or a misinterpretation. The claim of polarity inversion could easily be checked by monitoring the speaker's output with a mic of known polarity. Or is Cliffy going to claim that mics, too, have the "wrong" polarity? There are two likely points of confusion. First, the current flow through an inductor lags the voltage across the inductor by 90 degrees. (How a "double integration" occurs is not immediately obvious.) Second, most cone-type drivers are more resistive than reactive, so you're not going to get 90 degrees, anyway. Assuming (incorrectly) that the driver were wholly inductive, a double integration of the current would cause the current to fall at 12dB/8ve. Assuming the driver is working "constantly velocity", you'd still wind up with a 6dB/8ve net rolloff. (I think.) I have no objection to someone saying "Everything you know is wrong!". I do it all the time. But no one ever gives ME serious consideration, even when I'm dead right. Cliff, here, should be grateful I treated his claims with a degree of seriousness. It's far, far more than he deserves. |
Allison needs help kicking Meat Plow off Usenet
"John Fields" wrote in message
... Why do you want to take a sad song and not make it better? Phil's not so bad, he just has zero tolerance for bull**** and responds vehemently when he sees it. What's wrong with that? Lots. There's no point or need to "respond vehemently". A simple statement of the facts is enough. It doesn't help that Cliffy refuses to admit his own errors. |
Help with wiring colors on old headphones
"William Sommer****** is a colossal ****WIT" Testing a ( moving coil) driver with a battery establishes a polarity that is the reverse of the "real" one during normal operation. The *actual cone motion* in response to alternating current drive (within a driver's operating band) involves a double integration of the current wave [???] -- hence a 180 degree phase shift. ( snip) Bet anything this starts an argument. There's no argument. As a degreed EE, ** Shame you are also a 100% autistic metal retard. Assuming (incorrectly) that the driver were wholly inductive, a double integration of the current would cause the current to fall at 12dB/8ve. ** False assumptions lead to a false conclusions. The point is entirely about * cone excursion* above resonance as a function of drive frequency for fixed AC drive voltage. Obviously a cone does not follow the actual drive voltage wave - or the excursion and all frequencies would be the same. Once you work out the simple relationship is between drive frequency and cone excursion when the cone's mass dominates the game - you have it. ..... Phil |
Help with wiring colors on old headphones
The point is entirely about * cone excursion* above resonance as a
function of drive frequency for fixed AC drive voltage. Obviously a cone does not follow the actual drive voltage wave - or the excursion and all frequencies would be the same. Once you work out the simple relationship is between drive frequency and cone excursion when the cone's mass dominates the game - you have it. How dare you answer a criticism courteously -- what's the world coming to? I'll check my books on acoustics about this. |
Allison needs help kicking Meat Plow off Usenet
On Wed, 18 May 2011 06:36:19 -0400 Spehro Pefhany
wrote in Message id: : On Wed, 18 May 2011 20:30:08 +1000, the renowned "Phil Allison" wrote: "John Fields" ** Do you know what " meat plow " refers to ? Something that furrow one's brow? A reference to the Stone Temple Pilots. I think. |
Allison needs help kicking Meat Plow off Usenet
On Wed, 18 May 2011 20:30:08 +1000, "Phil Allison"
wrote: "John Fields" ** Do you know what " meat plow " refers to ? .... Phil --- I'd guess a penis. -- JF |
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