Can we leave the antagonistic personal crap out please.
Thanks
Thanks
No offence, but that's a mind-numbingly self-contradicting sentence. A man of science should not accept anything at face value.
I have no idea why you feel the need to make an enemy out of anyone who disagrees with you. It's juvenile and completely counterproductive
I've tried to poke you gently with a stick of common decency/sense several times in this thread, but every time you just seem to pretend it didn't happen.
Haven't got a single person on my ignore list yet, but you are awfully close at becoming my first... just saying (not that you probably care).
Ahh so I get personally attacked by getting called stupid, and I counter with the scientifically proven fact that hearing degrades with age, and I'm the bad guy. Just another example that BS is far more prized around here than scientific facts.
Can you point to a study that shows that the ability to detect distortion at 1 kHz degrades with age?
After all, we're not talking about tweeters here.
Proof that most of you are in the wrong hobby. Do something useful and knit me a blanket.
View attachment 38135
Another thing is unless you measure the driver yourself, you're taking any data at face value. Because you have no way of know for 100% sure that any independent testing is accurate either.
Yes, and samples, vary, too.
What's your point?
No data and nobody can be trusted anyways.
Hey,
Sounds like a great product . Do you know if this guy the guy who is gonna review them help them out in any way to make such a great speaker or is this not the same guy. Just Wondering.
Vance Dickason
Audio Consultation Services And Loudspeaker Design
I've been a Voice Coil and Audio Xpress subscriber for 25 years now. The best publications in the industry. But no Vance is not part of the Purifi team.
Proof that most of you are in the wrong hobby. Do something useful and knit me a blanket.
Can we start again considering DIY(OP)
No data and nobody can be trusted anyways. So just move on and start a thread on why an objectivist listens to vinyl as a source in 2019. And the scientific reason why. That's an oxymoron if I've ever heard one. It would be like a flat earther hanging out on a NASA forum.
Yes please!
If all else fails I wouldn't mind trying to model a box myself, just for fun. But I probably have a pretty steep learning curve.
Another problem is that the magnet in the transducer creates a static magnetic field, and this static field can be modulated by the changing magnetic field in the coil generated by the current in the voice coil. This phenomenon has been discussed by W. J. Cunningham, an article entitled “Non-Linear Distortion in Dynamic Loudspeakers due to Magnetic Effects,” J. Acoust. Soc. Am., Vol. 21, pp 207-207 (1949 May); and J. R. Gilliom, entitled “Distortion in Dynamic Loudspeakers due to Modulation of the Permanent Field.” presented at the 42nd Convention of the Audio Engineering Society, Los Angeles, Calif., 1972 May 2-5. . . .
That is, as current is passed through the dual coils, the dual coils move within the static magnetic field. At the same time, the current passing through the dual coils also creates a magnetic field around the wire, as a result, the magnetic field around the wire moves within the static magnetic field of the magnet, thus modulating it. The amount of modulation is substantially related to the number of turns in the coil and current being applied, or the total Amp-tuns. Modulation of the static field can also be viewed as a “global” modulation effect that is asymmetrical and in turn generates second harmonic distortion. Depending on the saturation level of the steel surrounding the magnetic gap, the moving field of the voice coil also creates a “local” modulation effect of the magnetic field within the steel surrounding the magnetic gaps so that symmetrical or third harmonic distortion is created in the output signal.
Ok so the end results of the design are meaningless, and the only thing that matters is if the parts used pass the criteria of your "audiophile buzzlist"?
Neo is lighter, more energy dense, more compact (i.e. fewer reflections from the motor structure back onto the cone), and self-shielding. Those are real advantages, not part of any "audiophile buzzlist."
While at $150 each neo may be too much to ask in a 6.5" woofer (though SB Acoustics, B&C and others manage), $400 each is a different stratosphere. ScanSpeak 6.5" woofers are clay ring magnets up to about $200 and neo structures from $300+. Revel uses clay disk magnets through Performa3 Be and neo magnets in Ultima.
I know of no performance drawbacks from using a lighter smaller magnet of a given strength. The practical caveat to neo is potential exposure to commodity price shocks. About a decade ago the Chinese artificially cut off supply, and neo costs temporarily skyrocketed. KEF for instance used to use a lot of neo. Even the midwoofers of their HTIB eggs had compact neo motors.Their current lineup, except Reference, uses all clay ring magnets for midrange and woofer (neo for tweeter).