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In Reply to: RE: DIY speaker design comments posted by AkuAnkka on March 29, 2014 at 11:15:55
Well here is the RD75 waterfall plot and the same for the Neo8 from the OEM and from an unknown DIYer
The scales are different, so don't be taken aback by the appearance of the RD75 plot. It actually goes down 30 db below the signal level, while the Neo8 values are cut off at -18 db or so.
Using the -18db cutoff for the RD75, the floor would be hit at about 1.4ms from 200hz to 2+khz and after the 2khz resonance the driver is damped -18db within 1ms to about 8-9khz, then finally 0.7ms for the top octave.
This is still way longer than the Neo8 which clears up to -18db at 0.4 ms. It is simply the faster driver.
Follow Ups:
i don't get what you're implying with the decay measurements. milliseconds are room acoustics to me not driver limitations. are you saying the rd's ring? as far as i know, the construction is similar. i would question the amp driving them if there were an audible difference.
Edits: 03/30/14
Its an energy storage issue, you get similar slowdown in decay by horn loading the Neo8.
We had a discussion about segmented drivers vs. long planars after the new Kingsound review from Doug Schroeder (sp). Part of it is a measurement problem where the aperature needs to be small to block incoming waves from above and below the measuring point at a delay. But I believe this was done in this case.
What I still didn't find is the THD vs freq curves for the RD series like this one from Zaph for the Neo3PDR and his THd sweeps. I had those on a computer that died before the scheduled backup, and they have been pulled from the net so I can't replace them.
Satie,
Have you tried the Way-Back-Machine? If you know the website, it may have been cached on the Way-Back-Machine.
HTH,
Tim
Thanks
Forgot about them
will give it a try
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