Talk:Audio power amplifier

message: The images shows amplifiers with toggles and dials, I think a better illustrations would be a  or simmilar.  — Preceding unsigned comment added by Elendal (talk • contribs) 05:15, 19 October 2021 (UTC)
thread_title:  Illustrations 

message: I'd like to edit the introduction of this article because it makes what I believe are two mistakes.
*(Refering to an amplifier's low power input levels) By "low power" it is meant that the signals are usually limited to those required to drive headphones (less than 500 mW).
The input stages to most audio amplifiers are designed to handle signals weaker then headphone levels.  Most audio amplifiers require their inputs to satisfy line level signal levels.
*While the input signal may be only a few hundred millivolts, the power amplifier's output may have a power of many watts.
This sentence mixes incompatible units: volts and watts.  I think "millivolts" should be changed to "milliwatts".
— Ke6jjj 18:47, 4 December 2006 (UTC)
replies: text: Agreed.  An audio amplifier connected to a phonograph's magnetic cartridge receives mere microwatts.  Using terms like "low" and "high" should probably be avoided altogether:  look at what happened with the RF band names:  very high, super high, etc.  — EncMstr 20:25, 4 December 2006 (UTC)
thread_title: Levels and comparisons

message: should this be the main page on audio amplifiers from which all other articles on audio amps fork off?--Light current 22:31, 31 January 2007 (UTC)
replies: text:  Renaming this article to Audio power amplifier would probably be a good move in any case. I bet audio power amplifiers are called simply "amplifiers" more often than "audio amplifiers", anyway, so not much value would be lost on the name of the article. As to where to collect different kinds of audio amplifiers (preamps etc.), Electronic amplifier would do the best, I now think. Maitchy says Electronic amplifier is overloaded, but that may be remedied by sectioning the article to kinds of lists, "by technology" and "by application". Olli Niemitalo (talk) 21:27, 1 October 2012 (UTC)
replies: text: I have renamed this article. I don't have a grand organization scheme in mind for this topic. I find that if you roll up your sleeves do work improving the individual articles, opportunities for organizational improvements begin to emerge naturally. -—Kvng 22:10, 1 October 2012 (UTC)
thread_title:  Main page? 

message: There are times when EQ might work: low SPL listening (fletcher-munson), bad mixing, achieving flat response to 20 hz.  Many homes contain carpet and furniture which changes the power response.  I would agree that an EQ, preamp, amp, should ideally be separate.
: I agree as well, EQ should not be part of this article. Ohgddfp (talk) 14:41, 28 November 2013 (UTC)
replies: text: Remember that there is also a direct arrival sound from the speakers.  EQ in an attempt to fix room reverberation and acoustics unfortunately undoes the frequency balance for the direct arrival sounds.  How to fix both? Yes, most "audio power amplifiers" are integrated with control preamplifiers that have tone controls.  But I think EQ and tone controls should be part of a section on sound reproduction in general.  So for the above reason, tone controls, EQ and room acoustics should not be part of this article. Ohgddfp (talk) 14:41, 28 November 2013 (UTC)
thread_title:  Audiophile bias 

message: About:  "TIM did not appear at steady state sine tone measurements, helping to hide it from design engineers prior to 1972."  There is an "elephant in the room" here that some readers may wonder about, and therefore should be included in this article.  It's true that harmonic distortion tests would not likely reveal all problems.  But testing for Intermodulation Distortion on the other hand reveals the same deficiences that a TIM test reaveals, PROVIDED that the heavy dose of ULTRASOUND in a regular TIM test signal is REMOVED.  This is why using the preamp to get rid of this ULTRASOUND by way of a reduced bandwidth, as your article already mentions, is part of the solution to get rid of transient intermodulation distortion, AS CAUSED BY THE TIM TEST SIGNAL.  But the elephant in the room is that in part, TIM tests use ULTRA SOUND to test a SOUND reproduction device.  Readers may wonder why this is VALID.  And they ask a really good question.  Especially since the ultra sound accidently leaking from even cheap CD players and any kind of phonograph cartidges playing vinyl phonograph records is VERY VERY WEAK.  FAR too weak to push an amplifier into NON-LINEAR disortion like a TIM test does.  In other words, using a limited bandwidth preamp stage only helps solve the problem with TIM tests, NOT problems using real audio signal sources.  So no, what fooled many engineers before 1972 is that too often, harmonic distortion tests were most frequently used, AND ADVERTISED, while in most cases testing for INTERMODULATION DISTORTION, a valid IN BAND test, was IGNORED. Yes, the ways in the referenced articles do indeed identify TIM and show valid ways to solve it, but because ultra sound in audio sources is so weak, and TIM tests are so strong in ultra sound, TIM tests therefore uncover a problem that doesn't exist in the real world. Ghidoekjf (talk) 03:58, 8 December 2010 (UTC)
replies: text: Ah, the shouting! Your rant fails to recognize that TIM test signals are often tailored to the frequency range of the device under test, so that out-of-band audio signals are not introduced. You are getting angry about a problem that is rarely seen at reputable companies. Binksternet (talk) 05:10, 8 December 2010 (UTC)
replies: text:  Oops!  (I'm also User Ghidoekjf)  I apologize for the upper case.  I should have used the bold button.  Please consider all the previous upper case to be bold instead.  I want it to mean emphasis, not shouting.  Actually, I'm not angry.  I'm exploring some of the apparently contradictory information from several sources.  I would like to see somewhere a TIM test, with tailored frequency content, where the test signal is played off a good CD machine or analog tape recorder, and the spectrum of amplifier input and output is different from each other.  Then I'd like to see the intermodulation test of the same amplifier.  In any case I think the TIM filter should be flat +/- 1 dB to 22 kHz, and down at least 20 dB at 25 kHz.  That's were I'd like to compare intermodulation tests with that kind of TIM test.  I'm still looking for one that shows a meaningful difference.  Know of one?
Ohgddfp (talk) 14:59, 28 November 2013 (UTC)
thread_title:  Transient Intermodulation Distortion 

message: This was added to Amplifier article. I think it is more appropriate here but I didn't want to try and jam it in. --Kvng (talk) 15:06, 3 January 2011 (UTC)
replies: text: It's not a great photo, with so much busy background and a too-great emphasis on the rolling rack which supports the amplifier. Also, it is obviously an amplifier opened up for display rather than one which is ready to work, or one that is working. If an image of a display amplifier is indicated, the photo should focus more clearly on the subject matter, so that the reader can see what's inside. This image fails in its task. Binksternet (talk) 16:07, 3 January 2011 (UTC)
thread_title:  Image 

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thread_title:  External links modified 

message: Early in this page, it talks about the "warmth" of the sound of electric instrument amps and, about transistors vs. tubes.
Electric instrument amps are designed to distort the signal.  And, when musicians talk about the "warm" character of tube amps, they are talking about the difference between the distortion caused by over-driving a tube stage vs. the distortion caused by over-driving a transistor stage.  Such talk should be well segregated from talk about amplifiers that are designed to faithfully reproduce an input signal.  173.75.55.14 (talk) 21:05, 30 October 2017 (UTC)
thread_title:  Electric instrument amps should be a whole separate subject. 

message: The beginning of the article states power amps are intended to take a guitar pickup signal, among others. Then in the next paragraph it mentions pre-amplification occurs before power amplification of such signals as guitar pickup signals. The example of guitar pickup output should be removed from the list of example signals that may be fed (it is implied directly) into a power amplifier  — Preceding unsigned comment added by 68.38.218.65 (talk) 00:33, 1 August 2022 (UTC)
thread_title:  power amp for guitar pickup signal.