Recent content by Keith_W

Thanks for the quick response, John. In hindsight, it may have been possible that I tried to play a 48kHz .WAV file on his AVR and failed. So I tried a 44.1kHz FLAC and it worked, so I left it at that. I don't know what is causing the repetitions. I usually bring my RME along when I take...

Hi John, I went to my friend's place yesterday to take some measurements of his listening room. I brought along my laptop, my Focusrite 2i2, and an XLR microphone. Unfortunately, I only have XLR outputs, and he does not have XLR inputs on his AVR. So I decided to take an offline measurement...

Examining bass decay is difficult because the signal-noise ratio at low frequencies is typically very poor and because you need to look at multiple graphs taken from multiple positions to get an idea what is going on. It can sometimes be virtually impossible to tell the difference between decay...

This is the 1m measurement of your left speaker. There is a very loud reflection (arrowed) at 1.1ms / about 0.4m path-length difference. This is not a quasi-anechoic measurement, and I would not attempt to correct any high frequencies using this measurement. Especially since: ... the huge...

Please upload the MDAT.

You asked what is causing that spike at 60Hz in your spectrogram. It is easiest to see what is happening if I make an animate GIF, so I did it for you. 1: No diffuser 2: With diffuser Now the diffuser does not matter. What matters is the shape of the noise floor. Take note of a few...

That streak at 60 is probably room noise. Can't tell anything from this extremely zoomed out view, it's like asking us to read the lettering on a golf ball from 200m away. Post the MDAT.

The measurement mic needs to be at least 2 baffle widths away from the tweeter to capture the baffle step. Most people place the mic at 1m. If you have an exceptionally wide baffle, the mic may need to be placed further away. The baffle step is a volume loss of 6dB that occurs over four octaves...

I would caution against correcting excess phase for high frequencies using measurements taken from the listening position, particularly if you have applied a 15 cycle FDW / no smoothing. That's a very high resolution correction. If you want to apply high-res EP corrections, you need an anechoic...

That's better. But rather than all this back and forth it is better to upload the MDAT. If you really want to look at that noise floor, the y-axis also has to be expanded (breaking the 50dB vertical axis rule) to show both the peak SPL and the noise floor. The MDAT will also tell me what sweep...

That is better, but please read and follow every last detail. I also said, "extend time window to 1000ms". You will see something like this: NOW you can clearly see what is noise and what isn't. In this case the noise floor is about -40dB to the signal with a tone at about 50Hz, possibly a...

In general, graphs should be displayed so that there is no wasted space above and below the graphs. With your waterfall, the vertical scale is too large, it spans from 0dB to 160dB. If you look at your data, a more sensible vertical scale would be 50dB - 100dB. Even though your graph is...

Hey @jan.didden I thought that your name sounded familiar. You are the technical editor of AudioXPress? Nice to see you here!

Yeah well, those aren't the measurements I asked for. It sounds as if you have decided on your own that you don't need our help in determining delays and seeing if things can improve with correction. So I wish you the best of luck, i'm not going to respond any further.

Please watch your labelling. You labelled your measurement "FL". We normally see this and think it means "Front Left". But it's actually a measurement of your left and right speaker. How do I know this? ... because I see two impulses in the IR. I can also tell that you haven't centred your...