Recent content by Keith_W

It wouldn't if you use WASAPI Shared. But I don't recommend it, WASAPI Shared sends everything through the Windows mixer. If all you are after is a test tone, it should be OK. But the Windows mixer does all sorts of horrible things to the signal - it's not bit perfect, it might resample the...

The loopback timing reference measures the discrepancy in time between two circuits: 1. The loopback (reference) circuit. Your Lynx might have a software loopback. If it doesn't, you will need a physical loopback (i.e. a cable connecting an output to an input). 2. The measurement (test)...

The reason you align from the listening position is so that you are sufficiently far enough from the speaker to avoid parallax error. There is nothing special about that distance. If you have a small speaker, you can put your mic a bit closer. But if it's a large speaker, then your mic will be...

You haven't finished tuning your speaker yet. Look at those broad dips between 200-500Hz, and another between 3-4kHz. I'll wager this is due to improper alignment at your crossover points, which you said are at 400Hz and 3.5kHz. The step response also indicates that nothing is aligned. You...

I was flabbergasted to see a perfectly flat amplitude response and a varying phase response, until I looked a bit closer. Your SPL scale is about 450dB! Choose something a bit more sensible, maybe about 5dB and you will see that John is right.

You're right, it should be interpreted with caution. I take measurements over a wide area covering almost every corner of the room, then I overlay them and see where they diverge. A true reverberant field should be the same everywhere in the room. If the measurement remains the same, it's a...

Have you tried using RT60 decay? You have to click on "Generate" first. Then move your pointer to your desired frequency. If you change graphs, the pointer remains in the same position. So you can check the RT60 in the same nominated frequency between graphs.

That ridge at 200Hz is an artefact caused by the short duration of your waterfall. Think of it like this: you are displaying the first 4ms. This means that any sound with a period longer than 4ms can not be displayed in full. Frequency = 1/period (f = 1/T) Therefore f = 250Hz. It's the...

I was going to say, I wouldn't trust any measurements (distortion or otherwise) until REW stops giving you error messages. If you are still concerned about distortion, take another set of measurements. Your mic needs to be 1m from the speaker, and the output of the speaker adjusted to 76dB at...

Here are your two MDAT's, which I have re-labelled according to your filenames since there is no other information provided. These are outdoor subwoofer measurements: - taken on different dates (14 Jun and 22 Jun) - the sampling rates are different with different impulse lengths (red =...

Just go use REW and rePhase. For a simple 2.1 setup, it's quite easy. Just remember that REW has no multichannel output, so if you want to test integration between your sub and speakers, you will need another piece of software (a convolver). You then need to pass REW's output through the...

John has previously said that he does not intend to replicate the functionality of rePhase in REW. Maybe he's changed his mind.

This is why I stay out of all threads created by you. But I draw the line when you go to other threads and try to mislead others. John Mulcahy himself tried to correct you here and here, yet you persist in insisting that the RT60 is a tool for examining speaker resonances. Most people would take...

I don't have the Pro version of REW. And i'm not sure if what you propose will work. Your XLR microphone requires phantom power, doesn't it? I don't think the Mac minijack has that. If you already have the hardware, you can try. And you probably need only one instance of REW.

What input are you talking about? If your input is an interface with an XLR cable, how are you going to plug your UMIK1 into that? You will need the pro version of REW which supports multi-input capture if you want to capture the output of 2 or more mics simultaneously.