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#41
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
"Mr.T" MrT@home wrote in
u: IF it is not purely resistive, then you are talking about IMPEDANCE, which I was not. So you were talking about DC, not ultrasonic frequencies. Keep to the topic, take your pure resistance with you when you leave. -- Bob Quintal PA is y I've altered my email address. -- Posted via a free Usenet account from http://www.teranews.com |
#42
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
"Mr.T" MrT@home wrote in
: Actually it is totally correct for a purely resistive circuit. And I never mentioned power factor since I only stated the voice coil "RESISTANCE" (not impedance) at the frequency under discussion. Resistance has no phase angle! "RESISTANCE" (not impedance) is totally out of the context of ultrasonic signals. You can talk all you want about pure resistance, but go do it somewhere else. -- Bob Quintal PA is y I've altered my email address. -- Posted via a free Usenet account from http://www.teranews.com |
#43
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
Bob Quintal wrote: "Mr.T" MrT@home wrote in u: "Richard Crowley" wrote in message ... "Chu Gai" wrote ... Assume there's a switching type amp that generally measures well. If the amp generates significant ultrasonics at around 400 kHz (say around a volt or so), will that... a) Cause any distress to the speakers at all or does it depend? Unless you have some unusually broadband tweeters, I would assume that no speaker is going to even attempt to do anything with 400KHz (or even 200KHz) Well the power is still going to be dissipated somewhere, possibly in the voice coil. Power is Voltage squared over Impedance. At 400KHz, the impedance of the voice coil will be so high as to result in zero (0) power to dissipate. And if the impedance is near totally imaginary, so will the power dissipattion be ! Graham |
#44
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
Bob Quintal wrote: "Mr.T" MrT@home wrote in u: IF it is not purely resistive, then you are talking about IMPEDANCE, which I was not. So you were talking about DC, not ultrasonic frequencies. Keep to the topic, take your pure resistance with you when you leave. And *SHUT THE DOOR BEHIND YOU* too ! Graham |
#45
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
Bob Quintal wrote: "Mr.T" MrT@home wrote in : Actually it is totally correct for a purely resistive circuit. And I never mentioned power factor since I only stated the voice coil "RESISTANCE" (not impedance) at the frequency under discussion. Resistance has no phase angle! "RESISTANCE" (not impedance) is totally out of the context of ultrasonic signals. You can talk all you want about pure resistance, but go do it somewhere else. sci.electronics.beginners Graham |
#46
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
"Eeyore" wrote in message ... IF it is not purely resistive, then you are talking about IMPEDANCE, which I was not. You're drivelling. If YOU don't understand the difference, don't blame me. MrT. |
#47
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
"Eeyore" wrote in message ... Unless you have some unusually broadband tweeters, I would assume that no speaker is going to even attempt to do anything with 400KHz (or even 200KHz) Well the power is still going to be dissipated somewhere, possibly in the voice coil. Power is Voltage squared over Impedance. At 400KHz, the impedance of the voice coil will be so high as to result in zero (0) power to dissipate. And if the impedance is near totally imaginary, so will the power dissipattion be ! OK, I will accept your measurement data when you provide it. I would rather bet the figure is SMALL as I suggested in the first place, rather than zero. I shall await your proof to the contrary. MrT. |
#48
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
"Bob Quintal" wrote in message ... IF it is not purely resistive, then you are talking about IMPEDANCE, which I was not. So you were talking about DC, not ultrasonic frequencies. Keep to the topic, take your pure resistance with you when you leave. So you don't understand that a complex impedance consists of both a resistive part and an imaginary part. The power being dissipated in the resistive part, whatever the frequency and phase angle? Your problem not mine. MrT. |
#49
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
"Eeyore" wrote in message ... sci.electronics.beginners So why are you not over there? MrT. |
#50
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
"Bob Quintal" wrote in message ... Actually it is totally correct for a purely resistive circuit. And I never mentioned power factor since I only stated the voice coil "RESISTANCE" (not impedance) at the frequency under discussion. Resistance has no phase angle! "RESISTANCE" (not impedance) is totally out of the context of ultrasonic signals. You can talk all you want about pure resistance, but go do it somewhere else. So you don't understand that a complex impedance consists of both a resistive part and an imaginary part. The power being dissipated in the resistive part, whatever the frequency and phase angle? Your problem not mine. MrT. |
#51
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
"Mr.T" MrT@home wrote in
u: "Bob Quintal" wrote in message ... IF it is not purely resistive, then you are talking about IMPEDANCE, which I was not. So you were talking about DC, not ultrasonic frequencies. Keep to the topic, take your pure resistance with you when you leave. So you don't understand that a complex impedance consists of both a resistive part and an imaginary part. The power being dissipated in the resistive part, whatever the frequency and phase angle? I undersatand the physics. What I can't understand is your ado about nothing. From any practical perspective, a 400KHz low level signal will not generate any dissipation into an essentially open circuit. Your problem not mine. I can live with my problem. Yours is obviously making your life impossible. :-) -- Bob Quintal PA is y I've altered my email address. -- Posted via a free Usenet account from http://www.teranews.com Warning: Do not use Ultimate-Anonymity They are worthless spammers that are running a scam. |
#52
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
"Mr.T" wrote: OK, I will accept your measurement data when you provide it. How would you like it stuffed up your rectum ? Graham |
#53
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
"Eeyore" wrote in message OK, I will accept your measurement data when you provide it. How would you like it stuffed up your rectum ? About what I expected from someone like you. MrT. |
#54
Posted to rec.audio.tech
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Question About Ultrasonic Noise In Amps
Mr.T wrote: "Eeyore" wrote in message OK, I will accept your measurement data when you provide it. How would you like it stuffed up your rectum ? About what I expected from someone like you. Aren't they just such a lovely couple? And such a good source of technical information, too! |
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