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Obtaining my White Whale (25 Driver IDS-25 Line Array Build)
Obtaining my White Whale (25 Driver IDS-25 Line Array Build)
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Old 17th April 2019, 11:31 PM   #51
Nvphotos is offline Nvphotos
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Default REW Measurements

Spectrogram
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File Type: jpg 2019_04_17 Spectrogram_Forward_Left.jpg (97.9 KB, 168 views)
File Type: jpg 2019_04_17 Spectrogram_Forward_Right.jpg (99.0 KB, 167 views)
File Type: jpg 2019_04_17 Spectrogram_Toed In_Left.jpg (99.3 KB, 163 views)
File Type: jpg 2019_04_17 Spectrogram_Toed In_Right.jpg (101.8 KB, 166 views)
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Old 17th April 2019, 11:34 PM   #52
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Default REW Measurements

Decay
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File Type: jpg 2019_04_17 Decay_Forward_Right.jpg (104.9 KB, 13 views)
File Type: jpg 2019_04_17 Decay_Toed In_Left.jpg (103.0 KB, 12 views)
File Type: jpg 2019_04_17 Decay_Toed In_Right.jpg (77.5 KB, 11 views)
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Old 17th April 2019, 11:36 PM   #53
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Default REW Measurements

Clarity
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File Type: jpg 2019_04_17 Clarity_Forward_Left.jpg (70.5 KB, 29 views)
File Type: jpg 2019_04_17 Clarity_Forward_Right.jpg (71.1 KB, 29 views)
File Type: jpg 2019_04_17 Clarity_Toed In_Left.jpg (68.7 KB, 18 views)
File Type: jpg 2019_04_17 Clarity_Toed In_Right.jpg (70.0 KB, 17 views)
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Old 17th April 2019, 11:38 PM   #54
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Default REW Measurements

RT60
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File Type: jpg 2019_04_17 RT60_Forward_Right.jpg (71.7 KB, 12 views)
File Type: jpg 2019_04_17 RT60_Toed In_Left.jpg (73.5 KB, 9 views)
File Type: jpg 2019_04_17 RT60_Toed In_Right.jpg (73.3 KB, 8 views)
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Old 17th April 2019, 11:40 PM   #55
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Default REW Measurements

GD
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File Type: jpg 2019_04_17 GD_Forward_Right.jpg (62.3 KB, 19 views)
File Type: jpg 2019_04_17 GD_Toed In_Left.jpg (57.3 KB, 10 views)
File Type: jpg 2019_04_17 GD_Toed In_Right.jpg (57.4 KB, 11 views)
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Old 18th April 2019, 02:38 AM   #56
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I got the soundcard issue figured out tonight. It was a box I had to check deep down in the preferences under configuration.
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Old 18th April 2019, 09:35 AM   #57
wesayso is offline wesayso  Netherlands
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That's a lot of data right there .

Even if we do see some differences, it is kind of hard to make something out of it right?
We need to "zoom in" in order for these plots to tell us something.

Are these measurements raw without EQ? The reason I ask is because of the general trends of the array being visible and the distortion graphs look funny to me.

I bet things will start to improve with some help. I see a rising distortion, even on the top end and do not see that trend in my setup, not even from my raw measurements. But my "raw" measurements almost always include some basic EQ to get a reasonably straight FR curve. I haven't done a real raw measurement in ages. It is some pré EQ I use to get it ready for further processing.

I think if we EQ the lines, the distortion graph will look a lot better.

First we might want to look more closely at these graphs. Use the limit button (upper right corner) to get the graphs more in proportion/scale and zoom in a little here and there.
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Last edited by wesayso; 18th April 2019 at 09:47 AM.
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Old 18th April 2019, 10:04 AM   #58
wesayso is offline wesayso  Netherlands
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I haven't got the time to go trough them one by one right now.
Start by saving these graphs a bit bigger, plot the SPL graps with 5 dB division on the scale to the left of the graph, leave phase out for now and smooth them to, let's say 1/12. Make the top 100 dB (limits button), bottom 45 dB, left is 20 Hz, right is 20000 Hz. Save them to about 900 pixels image width to have a readable graph.

At least we get to see a general FR trend that way. One thing is clear, the toe-in has a rather different balance than the face front setup. It also interacts differently with the room. That much we can see right now.

After that plot let's look at the IR's, your plots are in dBFS, nothing wrong with that to see the strength of reflections but we need a closer look.

Push the limit button, set it to dBFS Top: 10, dBFS bottom -50, Left s -0.001 and Right s to 0,050. Let's see the graphs from both setup's that way.

Next on the left side inside the graph, you can set it to % instead of dBFS.

On that graph change the Right s to 0,020 and plot all graphs like that.

Those will do for now, lets first see the balance, we might want to change that.
So no new measurements at this point, just a different view on what you've got here.

Got to run now, hope to get back to you later tonight. I'm sure there are others that can help, feel free to jump in.
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Last edited by wesayso; 18th April 2019 at 10:07 AM.
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Old 18th April 2019, 12:54 PM   #59
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Quote:
Originally Posted by wesayso View Post
That's a lot of data right there .
If you can tell, I have no idea what I'm doing

Yes, these are all unEQed.
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Old 18th April 2019, 02:23 PM   #60
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You're right about the distortion, it seems too high. The frequency response also has a strange dip around 120hz.

I've felt that the speakers have sounded fatiguing but I just attributed this the them being line arrays. It may be due to the distortion and frequency dip (and maybe first reflections?).
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