Dayton WT3 testing tweeters

[mitchyz250f]

I just purchased some used Morel MDT-44 and like any speaker I purchase I always test with my WT3. And alway after calibration.

The results were not very close to the published specs. Specifically the Fs was 1020 and not 750 Hz and the impedence peaks were off in magnitude and location. I repeated the test several times and the results were consistent. If the tweeter had not been used in a while could they require a second break in period?

Just to make sure it wasn't the WT3 I tested some LPG tweeters and everything turned up zeros. Another LPG tweet tested the same. These tweetes work and sound good. Then I tested some 3" Peerless speakers and my results were the same as published.

Any clues? I have read many things about the WT3 on forums. One person said you needed to always use the same usb port you used when you installed the software. Any truth to that?

Help.

[Johnny2Bad]

Okay. So you have a test instrument + regimen.
You calibrate the unit and operate it as directed.
You test a sample component, and the test result does not match the published specification.
You re-test multiple times and each time the results are consistent.
You benchmark against known samples and these samples provide results consistent with their respective published specifications.


I woud suggest the specification is wrong, or the sample component is not up to the specification, just as your instrument reports. As those who explore the wilderness would say ... "the map is not the territory". In other words, if the real object is one way the description of that object is another, then the description must be wrong.

Although popular, shooting the messenger is the least satisfactory method to rectify or understand the problem. From your description, you have done a reasonable job of eliminating errors in your method and test gear. Sometimes the obvious answer really is the correct one.

[caninus80]

Can I test fs of compression drivers by wt3?


Thanks
C