Recent content by dcibel

I use a Motu M4 and Line Audio Omni1 for my measurements. If you already have a nice USB audio interface, why are you looking at USB mics? For design a loudspeaker, it involves combining the response of multiple sources from multiple measurements, which requires accurate phase relationships...

I don't recommend usb mics either. I did just review the J-Box III, a great all in one speaker measurement kit to get started with speaker design, with a loopback timing reference. https://www.htguide.com/forum/mission-possible-diy/development-tools-techniques/957531-j-box-iii-review

Thank you John. One other minor thing I noticed recently, is that the frequency limits noted on the measurement thumbnails have a limit of 20Hz min and 20kHz max, so they will show 20Hz-20kHz even if the measurement was completed from 0Hz to 48kHz for example.

Is there a possibility for a higher resolution for burst decay waterfall or spectrogram, like 1/12 oct bandwidth?

FireWire died years ago, go with USB interface if you want to be able to use it easily with any modern computer.

🙄You can pick whatever voltage divider fits your needs. Add some zener diodes for protection if you're prone to doing silly things, personally I don't find myself running a measurement with input gain and output volume at max, something tells me I should look at the knobs before I run the...

It seems a bit silly to me to purchase a second sound card when a few resistors will do. https://www.htguide.com/forum/articles/do-it-yourself-diy/927384-dual-channel-measurement-jig

But...what if we run a sine sweep through FSAF, and load the residual audio through the spectrogram ;) If I save the mic input, the fundamental can be included as well. It works!

Great, thanks. I also realize that you can use this view with any audio data, via import -> audio data. It looks like I can forego the use of Audacity for the most part.

Amazing, another REW gem :) I need to figure out how to hide the blue dashed line that is cluttering the display, but otherwise this is exactly what I was looking for, thanks!

@John Mulcahy, I am wondering if there is any plans to incorporate a time domain spectrogram to view the residual result of FSAF. The spectrum analysis plot of the entire residual audio is great, but it is perhaps a bit over-simplified of a view when looking at 15 seconds of music audio. I find...

Great tool for making comparisons of FSAF results. For small changes where the difference can be diffucult to discern, the shootout feature makes it easier to determine if you can reliably pick out the differences in audio without knowing which recording is which...

What does a USB mic have to do with anything? Scarlett is a USB interface, plug a mic into it = USB mic.

Window reference time location is set by the largest peak in the recording. When the speaker is pointed towards a wall, a reflection may be of higher amplitude. This is normal. Follow measurement instructions for VituixCAD, set your window correctly on 0deg measurement, then apply to all.

Ok, no problem. Main issue that it would address is that the normalized SPL may be quite different between two measurements, so I have to adjust SPL levels to match peak SPL in order to get a matching waterfall plot for each. It's not a big deal, but is a few extra steps.