A question for DEQX owners ?

Started by Tranquility Bass, September 09, 2022, 08:12:49 PM

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Tranquility Bass

There are some privileged people who now own Klippel Near Field Scanners (NFS) which is quite an expensive bit of test measurement kit and which can cost up to $100,000 depending on options. Having said that, this device can do a near field scan of a loudspeaker which is just a fancy way of accurately measuring the frequency response of a speaker without using an an-echoic chamber.. But the downside is that it can take anywhere from 12 to 16 hours (according to a recent factory tour of the Magico facility) or more to acquire all of the data and that is the price you pay for not having access to an an-echoic chamber. This begs the question as to what DEQX are actually measuring and what have they been telling people they have been measuring all of this time when they stick a microphone in front of a speaker and do a 5 second sweep and then claim to apply an inverse convolution filter to fix up both amplitude and phase issues ? The correction is only as good as the measurement right ? What is it that they are measuring and what is it they are correcting ? Does anybody know ?


Tranquility Bass


Tranquility Bass

And here in lies the rub !

https://www.audiosciencereview.com/forum/index.php?threads/deqx-premate-8-digital-active-crossover-dsp.48884/post-2060183

Measuring Distance.png

Yes what is the optimum measurement distance for any speaker ? Surely it can't be the same for every speaker and if so what exactly are you measuring at the recommended 1 meter ? And to add, this simply will not work for speakers like the Duntech's or Dunlavy's and probably a lot of other speakers too. They have been optimized or designed with a focal point of about 3.3 meters or 11 feet. To state that people should place a microphone at an arbitrary distance of 1 meter is a flawed assumption and does not consider the manufacturer's design objectives. Doing this would totally screw up the response using this device! This is why Dunlavy invested in two anechoic chambers! And who says 1-meter is the optimum position as though it is written in stone and why ? DEQX have been advocating this procedure for years along with using linear-phase filters with all of their pitfalls. It is little wonder nobody in the hi-end audio industry uses a DEQX to design a speaker. It's nothing more than a pipe dream !