What does "Klippel Verified" mean?

[erinh]

So many dirty jokes lingering and so little time

Be honest. You know you've got plenty of time.

[Hillbilly SQ]

Be honest. You know you've got plenty of time.

Meh, my mind went to the gutter

Now moving on...

[Justin Zazzi]

T/S parameters vary depending on the way they are captured. Some companies derive this based on a simple sweep. Some companies will apply a stimulus to the driver for X time and then obtain the data via a sweep. Even something simple as how the driver is fixed during the test can alter the results. Good manufacturers will tell you how that value is derived.

All of the above and to make it even more confusing the T/S parameters that are published on websites are sometimes measured right off the assembly line so when you take them home and use them for a while the suspension will loosen up a little bit and the numbers will shift. In the grand scheme of things it doesn't change your box design, but having the numbers be so different can feel really discouraging.

And .... some companies, realizing a single speaker isn't always a good representation of the assembly line and all the little variances and tolerances over time, will take a few random samples and then average the data from these random speakers.

What you end up with is better average of what typically comes off the production line, but the T/S parameters are based on a fictional speaker that doesn't exist. This is when you can have problems typing the numbers into WinISD or BassBoxPRO and the software will complain about a sanity check or a consistency check failing.

A better way to do this is to measure a bunch of random samples and then choose the speaker that is the best-fit to the average of the group. This one single speaker is then usually saved on a shelf as the "golden sample" to which that speaker model can be compared against for the entire life of the product, sometimes for a decade or more.

So yeah, the more detailed companies will tell you how they found the numbers and that's always a small blessing!

[bbfoto]

Very cool, Justin. That's a huge step in the right direction especially for us DIY'ers. Mad props for helping to get this type of certification standard implemented. :thumbsup:

I know that several of the Alpine and Polk Audio drivers & subwoofers I've used in the past would specifically state in their "bullet points" in marketing material that they used FEA & The Klippel Analyzer to develop the drivers.

IIRC, one was the Alpine SPX-17PRO component set, and another, the 1st Gen Polk Audio MM-series subwoofers. But that's a fairly vague statement compared to what your Klippel Certification states.

[captainobvious]

Attachment 9091



The date of effective terms on that page, October 2018, is when the Klippel Data usage was introduced as a way to show that measurement data and reports made using the Klippel hardware were something a little more special than normal. Fun fact: this is something I helped create : )

Attachment 9092

Wait....what's the 3rd requirement?? I only see #1, #2 and A,B,C

[Jdunk54nl]

Wait....what's the 3rd requirement?? I only see #1, #2 and A,B,C

3) Must sacrifice your first born

[Justin Zazzi]

Wait....what's the 3rd requirement?? I only see #1, #2 and A,B,C

hmmm .... that's odd

[erinh]

Wait....what's the 3rd requirement?? I only see #1, #2 and A,B,C

Well, one thing is for sure... that's the part that Justin didn't help with.

[BigAl205]

I read it to mean that #3 is either A, B, or C

[SkizeR]

The third rule is if you have to ask, you're not verified