Recent content by Keith_W

Let me show you something. These are the impulse responses for all your left sided measurements. If you select them and click "Align IR start", this is the result. The reason why this matters: Compare the vector average you obtained without aligning IR start (green) with mine (purple)...

Re: SPL range. Most likely your microphone does not have SPL calibration + you skipped the SPL calibration step in REW. If you want your SPL range to accurately reflect what was measured, you will need an SPL meter. Do you NEED an SPL meter? No, not really. It depends on what kind of...

Please watch @fedele video. Link here.

Hi Dave. I love Sydney. In fact I have a rental property over there in Zetland. You do not want to correct artefacts from microphone positioning. If you mount a mic on a tripod and take a single sweep, that mic is capturing sound from a very specific point in space. If there are a lot of local...

Look at that huge forest of early and loud reflections (ETC taken from measurement of left speaker alone). Are you using one of those mini tripods that come with the UMIK-1? This is typically what you see when you use a mini tripod and perch it on a chair, or wedge a microphone between books to...

Unfortunately, I don't see a way forward. The problem with those cameras is the processing that is done to the audio once it is recorded - it may be compressed, or recorded at a different sample rate. Some of them even have noise cancellation. Goodness knows what that will do to a test signal...

I am sorry, I misunderstood you. When you said "recording", I thought you meant recording music or using REW to analyse music files. I now realize that you meant recording a test signal for the purpose of analysis. Re-reading your initial posts, I don't think it's entirely my fault that I was...

If that's what you want to do, then you're better off taking a proper logarithmic sweep rather than recording random noise? Also bear in mind that the microphone in the security camera and the UMIK-1 are not comparable. The UMIK-1 is omnidirectional and will be much better at capturing ambient...

You're better off using something like Audacity. Like REW, it's a free tool. But you can certainly open a .WAV file in REW: That's the first few seconds of Billie Jean. REW has a limit of 101 seconds. I'm not sure how you can increase this limit. If you want to record, I would use Audacity...

Congratulations, you are getting closer to diagnosing the problem. We have now confirmed that the reason for the missing bass is due to some kind of processing upstream from the amplifiers, and it is logical to suspect either the computer or the AVR. I think we can easily rule out the computer...

I don't think this is an acoustic issue. With your previous measurements, I have already checked if poor microphone centring was the culprit. It was not. I also tried inverting the phase and summing. This was not the culprit either. After viewing your video, I suspect this is due to some kind...

It is very difficult to have faith in your measurements. Here are two measurements labelled "L Carver Bass Module Only P2". You would expect them to be exactly the same. As you can see, they are not. In fact, if you examine the step response of both measurements, you can clearly see that...

1. I don't know what "P2" and "P3" are, so I ignored them. 2. None of your measurements have a timing reference. 3. If you want to see what happens when L and R are playing together, use "Vector Sum" not "Vector Average". This is a comparison of your actual measurement (blue) vs. the vector...

Please post the MDAT.

Sorry, I thought I was explicit enough by saying it's "EP GD". It's excess phase group delay.