Recent content by Keith_W

After thinking about it a bit, you are probably correct. That subwoofer IR is "hanging" somewhere in time with no time reference, so it needs to be swept with a tweeter chirp or loopback.

The subwoofer and main speaker come off the same DAC channel and are therefore, synchronized.

You're welcome. Re: crackling. You need to make sure it's crackling you are talking about, and not stuttering. Stuttering = digital. It's due to lost packets / buffer starvation, etc. A lower sampling rate usually helps. Crackling = analog. The problem is somewhere downstream of the DAC...

Anyway, first things first. Let's look at the controls available to you: All you have available is (1) volume (2) XO point (3) phase 0deg or 180deg, (4) find a better position for your subwoofer. It is fortunate that this particular REL subwoofer has a low level input unlike some utterly...

D'OH!!!! Sorry @DL_Can I withdraw what I said!!! Looks like it was me who missed that little detail! Please accept my apologies. I'll take another look at your measurements. Well, I am sure you know as well as I do that if you want to properly integrate a sub, you need independent control of...

When you press the "measurement" button, look for this in the dialog box.

@DL_Can I took a look at your MDAT. You missed this important detail. Throw away those measurements and start again, and please be sure to carefully read what is suggested.

From this graph it is apparent that your left and right speakers are not symmetrically positioned in the room. There are huge room modes with the right (red) speaker, and the left looks much better behaved. There is also something odd going on with that dip between 2-3kHz and the plummeting...

Hello everyone, I have written two free eBooks on how to take and interpret measurements with REW. Both PDF's can be downloaded here. I strictly limited my focus when writing this book. (1) it's written for beginners, (2) it was not my intention to replicate the REW manual, (3) there is no...

You can see from my screen shot that the burst period has been set 128k samples. This exact setting was working earlier today on the previous beta version of REW.

Hello John, I would like to report a bug. As you can see, the generator has been set to output a 6.5 cycle sine wave tone burst. On the right is the oscilloscope showing the loopback (yellow) and the acoustic measurement (blue). The output is much longer than 6.5 cycles. Thank you for adding...

Hello John, I normally use different measurement software but I am trying to develop some procedures in REW. I am using an XLR mic + RME Fireface UC to do all my measurements. The mic is on a proper mic tripod, and I moved all the furniture out of the way between mic and speaker. The mic was at...

That is a good point. In any case I will be making new filters this weekend. I have lost faith in the old ones - they sound weird and measure weird.

Yes 3ll3d00d, I thought that the difference was quite odd too. But I started this thread on this forum to figure out how to take the measurement because I could hear a difference between HQP and AC. The result recorded by REW confirms that there is indeed a difference. I posted a discussion...

Thanks John. I was watching the meters like a hawk and I did not see any clipping. There was about 15dB of headroom. My reasoning is that high level volume improves the signal to noise ratio? If my results are invalid i'll have to repeat them. What do you think?