John Curl's Blowtorch preamplifier part III

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#10,281
jneutron said:
Some papers I had researched used a zero crossing model for localization. It seemed far too simplistic for a complex musical soundfield where assymetrical lower frequency content would provide a different DC level to higher frequencies, and then mess up the ITD timing. Unless of course the coils do a progressive high pass with distance.

I suspect there is far more processing going on between the ears than just zero crossing timing.
Well, except for Billy Joe, Betty Joe and Bobby Joe... 😀

I'm not at work, I'll see if I can find the papers next week.

Jn
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I looked into localization using zero crossing, JN & from what I gather it's in the realm of computational auditory scene analysis (CASA) using specifc sets of algorithms - which is interesting in & of itself. It may have application for hearing aids, etc but is not necessarily a good analog to the workings of auditory perception
 
#10,282
Breaking News: CMA -- Almost done and in final testing ---

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High Slew rate, Very Low Noise, Ultra low distortion at any frequency and any power level and any load impedance.

Very accurate sound reproduction quality.

Back over to Scott....


THx-RNMarsh
 
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#10,283
mmerrill99 said:
LSD (but within reason) gives a great insight into just how our perceptions are internally generated & experiencing synesthesia directly confirms this
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Been there LSD, with any control (i.e. within reason) does not compute. Once one has gone down this path the straight edge is hard to take. The pure output of energy with no substances at all is invigorating and equally revealing. Get down in the pit at a 1980's Minor Threat concert. I miss Waly.

YouTube
 
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#10,284
scott wurcer said:
Been there LSD, with any control (i.e. within reason) does not compute. Once one has gone down this path the straight edge is hard to take.
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I'm talking about control over the number of times taken rather than the trip itself (although correct surrounding environment & people is important). Not sure what the straight edge means?
The pure output of energy with no substances at all is invigorating and equally revealing. Get down in the pit at a 1980's Minor Threat concert. I miss Waly.

YouTube
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Sure, I know the experience - I've abandoned myself to physicality too (without & with substances) but still not interested in the pit
 
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#10,285
I went to a Messiaen concert once. After an hour and a half of 'des canyons aux étoiles' I really wasn't sure what had just happened to me. And something that a 2 channel replay system, whatever you do to it has not a hope in hell of recreating.



Time to retreat to the shed and build a 7.1 sound egg for myself.
 
#10,286
mmerrill99 said:
I looked into localization using zero crossing, JN & from what I gather it's in the realm of computational auditory scene analysis (CASA) using specifc sets of algorithms - which is interesting in & of itself. It may have application for hearing aids, etc but is not necessarily a good analog to the workings of auditory perception
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As I recall, I had the best luck when I was using google scholar. I've been quite pleasantly surprised by how well it worked when looking for research. When I was researching micro wire EDM for my home build, it was great searching and not having half the results being bikini clad women with pacifiers in their mouth or deadmouse pics. I mean, I do like EDM (and bikini clad women of course), but when I'm searching electron discharge machining, just stop with the non topics..

Zero crossing is a good ITD measure, but it requires knowing the frequency. It seemed so counter to what I would expect. I hope I still have my notebook with the localization stuff.

Jn
 
#10,288
tapestryofsound said:
After some rumination, I think it maybe it is the cheapo nasty class d bridged mono bus pumping chip amp that is at fault. Solution is to drop the eq by -2b at 50hz. Seems less bothersome now with the newish alnico speaker than the ceramic one before it. Methinks the alnico magnet is buffering the current - perhaps - perhaps not, but the cloth surround and spider after a 100 hundred hours is still breaking in, and is taking at least 30 minutes at the beginning of a session to loosen up.

I don't listen to rock music all that much, but I do like Grotus. Very funny, very political and the singer has a voice like a chainsaw. A band that makes fuzz sound intelligent, like an educated punch to the head.

Sadly, I've given up using emoticons, they're just not funny enough.
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Have you some other complex music you could try? Full orchestra for example. I often use familiar Zappa pieces as a test, complex, multi-layered mixes, immaculately produced.
Horns can be great, but can also be difficult to get right, your speakers are a bit of an unknown quantity. You mentioned that they are lacking in the extremities, this could be a factor.
There's always the option of Max's goop, guaranteed to remedy all known maladies, unfortunately it isn't available to us mere mortals yet, and I doubt it ever will be....
 
#10,292
🙂 I was thinking more along the lines, how many of us would really want the full concert experience in our living rooms even if it was attainable? There have been a few threads lately along the lines of, how do I get a realistic reproduction of real instruments in my room blah blah blah.... I question how desirable it really is.
 
#10,293
Technically it is quite impossible to achieve, however quite satisfying result is possible for a smaller chamber orchestra or string quartet. I think we who visit live classical concerts on a regular basis prefer more neutral and less colored sound. Thus the neverending debates. For example, I do not like sound of big horns like Lowther or Oris.
 
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#10,297
quoted by Scott Wurcer:
Contrary to classical electrodynamics assumption, generators and batteries do not use their available internal energy to power their external circuit, but only to perform work on their own internal charges, separating them to form the source dipole connected to their terminals. As is well-known in particle physics, any dipole is a broken 3-symmetry in its violent energetic exchange with the active vacuum. This means that the source dipole—once formed in the generator or battery—transduces some of the unusable virtual flux energy—continuously absorbed from the vacuum—into real, 3-space, observable EM energy and pours it out in all directions.
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You can write computer programs to generate this sort of stuff. Just feed it some genuine physics paper to digest, and a random number generator. If you are lucky it will fool potential investors; if you are really lucky some ignorant general will throw defence money at you too.

RNMarsh said:
If you measure this with a small R -- fast charge time with polar type cap and asymmetrical transient waveform, you will see it.
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It is easy to frighten yourself with time domain waveforms. DA is linear and only affects very low frequencies, hence it can be ignored for audio. If there is some other dielectric problem which happens to be well correlated with DA then that is a separate issue.

I too like Messiaen, but small doses.
 
#10,298
scottjoplin said:
🙂 I was thinking more along the lines, how many of us would really want the full concert experience in our living rooms even if it was attainable? There have been a few threads lately along the lines of, how do I get a realistic reproduction of real instruments in my room blah blah blah.... I question how desirable it really is.
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I surely would and I'm also aiming for it 🙂

//
 
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