It would have been interesting to see it at other frequencies. Some traces I've seen are at very precise frequencies and places which makes me suspicious 😉
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I seems a useful way to time align, have you looked for square waves at other frequencies and/or places?
The graphs he showed even had scales, which was a pleasant bonus. (probably because they weren't his 🙂)
You must have missed the serious work done on low noise phono stages and debunking LEDs and solar panels as a fancy power supply. Things made and measured and learnings shared amongst the community. I for one am very grateful for the experience imparted (and from Hans, Scott and others in this area). Jusrt becuase the lounge is not considered a place for serious design by some doesn't mean they don't do it in the relevant forum!
Richard,
I still think it’s good practice to always mention the source for two reasons:
1) it enables others to find out how these recordings where made and how to interpret the information.
2) it prevents from being accused of showing off with other peoples feathers.
Hans
P.s. interesting audioXpress link that you gave
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Yamaha is great, however, they heavily rely on actually engineering their products. This may not be enough for the discerning audiophile.
I rest my case. Just personal insults no attempt to answer or understand the question, as usual.
Not sure I ever thought I was going to do any of those. I realised I wasn't going to be Tony Stark at about 20!
I show a link when it is helpful to show how something was done in detail which is a more "modern" approach in contrast to my all analog approach.
I showed a weak diode plot without link only to show the diode model is real re copper oxide. It never occured to me that others would think i am claiming credit for the data or photo. Why would taking credit be important. It wasnt something new (to me anyway). It is there only to show you it really, measurably exists. Least one is accused of imaginary physics.
THx-RNMarsh
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yes, that is true of many other speaker types.... esp cone drivers. It may look great at one fortuitous freq and not so good other places. From experience, the new QUADs are very good over a wide range of freqs.
Creating a time accurate speaker that will reproduce a square wave is only a matter of finding engineering solutions to the problem.
The difficulty is not in doing it but in realising it is necessary.
THx-RNMarsh
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Yes, I can get some good looking traces, if I find a good position then move the mic away whilst keeping it in the same vertical and horizontal planes the shape comes and goes, it makes me wonder how useful it is as a measure, other possibly for crossover alignment.
???
Polarity is just moving the phase of 180°. All the purpose of time alignment is both speakers of a two way speaker move in phase at the crossing frequency so their acoustic pressure can be added with no loss. Or subtracted if you set one of the speakers out of phase of 180°.
Your tip has this advantage, it is easier to find a null or a minimum than a max by listening.
if I showed group delay, it is because with the time the signal takes to travel from the source to the ears, phases are turning, but the relative phases between the two speakers don't.
Moving out of the near field will cause a lot of room reflections to interfer with the direct sound from the driver. You wont be able to tell much about the driver out in the far field. Windowing techniques to block reflections are needed... Now you need more sophisicated measuring equipment.
THx-RNMarsh
It often hase the same effect,but it depends on the signals. Asymmetrical wave forms will be mirrored wrt the time axis when the polarity is switched while that does not happen when moving the phase by 180 degrees.
I automatically get 2 lottery tickets every week (you sign up on the website). I'm £14.80 ahead.
I know the chances of winning are about 14 million to one but I tell myself its for a good cause. Well, at least that's my excuse!
I've toyed with the idea from time to time but have managed to resist so far.🙂 In my case I don't see it serving much purpose, I could use DSP and EQ the phase to my listening position but to what end, would it make that much difference? So long as the sound from the speaker is accurate the room effects are something else with a different level of relevance?
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