Recent content by bangiel

Ok, the grand finale. I ran 4M, High Filtering during the calibration and measurement steps: Mesa Traditional 4x12 (Celestion V30s) - no port (afaik) Mojotone Grand Canyon 4x12 (Celestion V30, Mojotone BV30H) - rectangular port at bottom of front baffle Mojotone Twin Canyon 2x12 (Celestion...

And here's 4M, High Filtering:

No filtering looks better to me:

I'm getting there. I turned off everything I could in the vicinity of my workspace. This is will high filtering:

I’m pretty confident in the fit and function of the speakers and the enclosures. Of all my potential issues, I don’t believe this is one of them.

The noise is still present after clearing the calibration. What a weird turn of events. Truthfully, all I wanted to derive from this was the resonant frequency of the driver in the enclosure. I can glean that information, even from a noisy plot.

It's now occurring to me how much noisier my current measurements are vs the ones I originally posted. Oddly enough, nothing about my set up has changed (testing the original jig yields the same results). I have no idea what's introducing all that high freq noise all of the sudden.

Good idea. The noise is still present with a 10Ohm load. My measurements fall apart in similar fashions, especially after 200-300Hz.

I have 5 speaker cabinets and all are producing similarly noisy plots. The only thing that makes the plots look "pretty" is smoothing (surprise, surprise, right?). I'm not saying REW is to blame, obviously. The common thread is my audio interface / speaker cables / jig (granted, I've tested...

NIOSH app is measuring 30-33db[A] in my space - it's pretty quiet I tried with the HP output at full and half with no difference I tried 1M sweep and 4M sweep with no difference I tried no filter and high filter with no difference I am using the HP output

This fixed my issue. I misunderstood the short circuit cal step. I'm getting what look to be good measurements, however: They don't look that different from the no-cal measurements There's still a good bit of noise - the measurement isn't super clean by any means

Understood. I will try that.

I rebuilt my jig, and I'm still not getting proper short ckt results. In fact, I removed the jig entirely from the equation, and the short ckt measurement is still messed up. I shorted the headphone and test lead connections as such: And I'm still seeing a non-zero impedance: What could I be...

This is helpful, thank you. I'll check the jig again.

I've used a couple different sense resistors. 100Ohm was my first try, and the results were the same.