Recent content by Peregrine

Can air pressure have an impact on measurements? Where I am in Johannesburg is 1700m above sea level.

Each measurement yielded the same Mms result of 9.55g for the 6 inch driver. Thus the average remains 9.55g? Am I missing something.

In the results for the 6 inch the Mms is 9.55g, does that answer your question?

I loaded the old measurements into V5.20.2, Qms went down to 10.601 from 14.360. Spec sheet is 3.8011.

You are correct the measurement was done with the previous version, but looking at the results of the 6 in driver measurements from old version vs new the QMS went from 4.5 to 6.135 QES from 1.477 to 1.848 and Qts from 1,112 to 1.420, I was expecting it to go the other way. I can pull the 18...

I am not sure the Q values are correct, when I measured the driver with the known values the Q values were very different. Listed spec from manufacturer Qms 3.8011 Qes 0.39089 the recorded specs were Qms 14.360 and Qes 1.922. Fs was 25.4 and 25.9 very close

Thanks for the info provided above, I have ordered a new scale that goes to 0.01g hopefully that will improve results and secondly the weight being balanced around the cone makes sense. But my concern is assuming the weight value is wrong adjusting it up or down by 5g in the T/S calculator has...

Uploaded wrong file.

So I ran through the whole procedure again, with the new downloaded software and using 20g of weight. Could you take a look at the files and comment please, do you think thy are accurate?

Ok, apologies, I misunderstood your previous comment, I will try with a lower DBFS, and downloading latest version. What is the min/max range QTS should be in so I know the results are accurate or is this a silly question?

REW 5.20. RC13b I will download latest version and try again.

In the Measurement screen you have the option to change the sweep start and end. normally 0 to 24Khz, When I set it to 20hz to 20Khz it defaults back to 0 - 24 when pushing start.

I tried with 15g and got very similar results, I tried the 20hz to 20000hz but REW resets the values when I press start. Btw, thanks for the prompt response.

I am experiencing a strange problem. I have measured 4 drivers, 3 of them have unknown specs and the 4th I have specs for. The QMS and QES are way out but Fs is spot on. What I have tried so far is rebuilding the test rig/harness 3 times and have used different jacks front and back of PC still...