This is an example of where the speaker terminals were grounded by the test apparatus.
We also found on getting the amp back that there were two other minor problems- one was a bad power tube, the other being that on his bench the amp was running less than the proper line voltage (with a fairly hefty filament circuit, line voltage is a little more important). Once corrected we got the correct power readings.
A customer of ours was restoring an older amp originally built about 23 years ago. After some of the work was done he was trying to measure distortion which came in about the same range- I had him correct the ground issue and that amp came in with out 2% THD at full power. Mind you, the newer amps are lower distortion than what we made 23 years ago! When the measurements were taken for the link in question, I did not sort out until later why the distortion was so high. These days we typically see about 0.5% THD; not bad for an amp with zero feedback.
Only if you think the human ear is vastly different from the one that was evolved millions of years before we came along.
Sabre toothed tigers? Seriously. And no mention of our low frequency abilities or direction finding there.
ref bird song speak for yourself. In my garden I can hear house martins, lapwings, robins, skylarks, finches, tits, red kites, sparrows and owls. You can't see the owls, but you can plot their flight overhead.
Make your mind up if our 5KHz hearing is for us to predate or to prevent being predated. Or are you claiming both based on what beardy bob the trapper told you over a beer? The thing that will most give you away is your smell BTW. Deer can smell you a mile off. Didn't used to stop the bastrads eating all my roses.
We all accept our hearing is most sensitive 1-5KHz, peaking at 4KHz. That has been known since before most of us were born. We need to find an evolutionary anthropologist (or whatever they are called) to update us on the latest theories. Anyone know anyone?
logic?
None needed. Knowing how loud the darn thing is going to be pretty helpful. Imagine not being able to distinguish volume??
As I said.
Actually I took several classes on the subject. I am claiming both, since man is in fact the most dangerous predator on the planet.
4KHz peak: well within birdsong range and also some of those peaks I pointed out earlier. You've not refuted anything I've mentioned on this topic so far, despite calling BS on it.
Folks, I know that my comments on brightness are not popular. But drop the popularity thing for a moment because its a made up story. We all want our brainchildren to be perfect, but its not a perfect world and our efforts at audio won't be either. But we can make them better even if not perfect. However the first step will be to recognize that there is a problem. You can shoot me if you want but I am only the messenger. The fact is I want SS and feedback to work (and by that I mean no coloration). Sure, I make tube amps. But if you think that I'm married to them or something then you don't understand who I am. The reason I make tube amps is I've not been able to make solid state amps that don't sound like solid state amps. All amps, tube or solid state, should just sound like real music make no mistake.
Absolutely honest question: have you ever been party to a well set up blinded test (volume matching, etc)? The quote above an awful lot of opinion.
Without being too disparaging, you've been long on ideology and short on technicals in this conversation. There are a bunch of very good designers and generally smart people bouncing around this thread. Sometimes the best thing we can do is pay close attention to those with different views on things and learn/refine rather than dig in your heels. (That's not just you, however)
We evolved from small mammals that had hearing attuned to hearing insects. We also have a larynx that can handle deep diving for some screwy reason.
The direction its coming from would seem to be just as useful. "it's really close but fsck knows where it is" does not seem a good survival trait.
So you can cite learned references on this? If you believe the out of Africa theory then we evolved as savanna pack hunters chasing prey down. Not many squirrels in the savanna to scare off the antelope. Meercats maybe.
Well you started with 5kHz which is above most non-urban bird song. The really high frequency stuff is rare, but you know this as you took the course. The fact that birdsong in noisy urban areas is now higher in frequency is a fascinating example of how some animals adapt, but of no use helping understand your basic premise that our hearing is optimised to birdsong and that gave us some huge evolutionary advantage.
Correlation is not causality. Unless you are trying to sell something to the gullible.
Well without some references we can go look up one could come to the conclusion that you have made it up.
The FFT gain got ignored so as to paint the noise 'floor' of 24bit PCM about the same as that of DSD.
in regards to post 685
From a ev/bio perspective there is no need for `logic' needed in regards to billshurv point about the human ear evolution; paleontologic evidence is definitive. For that matter, look at the other great primates. Inner ear structure, both bone and neural, very similar. As far as I know, all mammals have the same basic structure. Except most of them hear better then we do. The big diffenence between us and other primates is in visual processing. That extends to differences between men and women.
From a ev/bio perspective there is no need for `logic' needed in regards to billshurv point about the human ear evolution; paleontologic evidence is definitive. For that matter, look at the other great primates. Inner ear structure, both bone and neural, very similar. As far as I know, all mammals have the same basic structure. Except most of them hear better then we do. The big diffenence between us and other primates is in visual processing. That extends to differences between men and women.
Almost - it is wrongly scaled in the X dimension, the part from about 1MHz up has been shifted out of the diagram, this is where the noise floor ends up meeting 0dB (at 1.4112MHz). It does actually provide 24 bits of resolution up to 20kHz. Which, actually, is somewhat beside the point given the standard 2Vrms output for full scale, it's a real challenge getting more than some 21-22bits equivalent dynamics due to the noise floor attainable by real life conditions. It is even more beside the point if you overlay Fletcher-Munson curves over that graph.
If you adjust the plot for a 2nd order filter at 50kHz you still have some 55 or so dB of attenuation, which is a 500-fold signal attenuation at Fs, and this is not counting on any other RFI suppression mechanism including in the amp itself, not to mention that in most cases there will be little if any available gain there. I'm sorry bu under these conditions, driving an amp into destruction = incompetent design of the amp.
Only in the bin bandwidth of the FFT (not specified but probably at most single digit Hz).
Good luck, these threads have become such a waste of intellectual energy, why bother. Sound of feedback, such BS, give me a break.
even 18th century firearms didn't give really great odds to a single human vs a Grizzly
although by the time of human occupation of the Americas better flaked stone points and cooperation did for the megafauna
but in Africa you can count back a much longer time over most of it Homo was just scraping by - likely more often being cat food than eating any they surprised themselves by killing
although by the time of human occupation of the Americas better flaked stone points and cooperation did for the megafauna
but in Africa you can count back a much longer time over most of it Homo was just scraping by - likely more often being cat food than eating any they surprised themselves by killing
I cannot resist reposting this
Ref just scraping by, it was worse than that if the sums on rates of mutation
are correct.
I read once that australia was lush forest until man arrived and decided grassland was better for hunting so burned it down. As this was written by a white man I am not taking this as gospel...
The oldies are the best.
Ref just scraping by, it was worse than that if the sums on rates of mutation
are correct.
I read once that australia was lush forest until man arrived and decided grassland was better for hunting so burned it down. As this was written by a white man I am not taking this as gospel...
Until someone points me to a respected study proving these higher harmonics are audible in certain modern, well designed amps (like the ncore), call me unconvinced by the hand waving.
Also, there is no metric for brightness. It's a subjective perception. Not everyone agrees on what constitutes "bright", or 50% "bright", or "twice as bright". If you have a metric Ralph, please publish it. Again, more hand waving.
It seems the fact that some don't perceive some ss or class d as "bright" doesn't register with you. Not all call tubes "warm" either....Hmmmm....
I see logic has left the house on this discussion. I'm right behind it....
Also, there is no metric for brightness. It's a subjective perception. Not everyone agrees on what constitutes "bright", or 50% "bright", or "twice as bright". If you have a metric Ralph, please publish it. Again, more hand waving.
It seems the fact that some don't perceive some ss or class d as "bright" doesn't register with you. Not all call tubes "warm" either....Hmmmm....
I see logic has left the house on this discussion. I'm right behind it....