Should we (I) get into speaker testing & measurement

[napilopez]

I didn't read through the whole thread, but this just looks like an automated near-field polar with cepstral editing.

The automated polar is nothing new, though their technique is different.

Note: getting closer to the source entails losses in measurement accuracy (with combing artifacts and non-coincident sources/drivers), so the Klippel machine is making measurements closer and further out to compensate with probably some modest gating at further distances for higher freq.s (which also results in some measurement accuracy loss).

http://www.audiomatica.com/wp/wp-content/uploads/audiomaticaISEAT200911.pdf

As for the cepstral editing:

http://musicanddesign.speakerdesign.net/Cepstral.html


The fact is that you can do this with a more typical turn-table with the typical gating + near-field, add-in cepstral editing for those low freq.s in a good environment (sealed with repeatable low-freq. behavior), and get results that are at least as good (higher resolution). You could get half of your vertical at the same time you are doing your horizontal by making an array of mic.s vertically (an "arc") - you could do this cheaply with inexpensive mics. with a good calibration file.

https://outline.it/outline-products/measurement-systems/et-250-3d/

I'd suggest EASERA and an audio interface with a lot of inputs (for those vertical mic.s):
http://easera.afmg.eu/index.php/es-software-en.html

Soundeasy has cepstral editing:
http://www.bodziosoftware.com.au/

Hi! Welcome to the forum. A bit late to the party given Amir's already measured a couple dozen speakers though It seems the Klippel was worth it simply for the speed and consistency of the measurements.

That said, you might want to participate in this thread, where some forum members are discussing a DIY method of achieving klippel-like results.

 

[ScottG]

Sorry about that.. should have read through the whole thing.

(..I was reading the latest from NTK and Dave and assumed that it was still being discussed.)

Yeah, speed and consistency is enviable, perhaps more-so is the ability to do it in a smaller room. (..really the method I outlined should be measured at 2 meters with half-a-meter off of the floor full with absorptive material to take the gating to lower freq.s, and at least a meter beyond the mic.s - in particular that requires high ceilings ..especially with higher loudspeakers.)

 

[amirm]

I put a note in the OP to update that the system is already purchased and operational.