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Search: Posts Made By: JohnPM
Forum: Audio Theory, Setup, and Chat   06-06-2015, 03:50 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Not for the UMIK interface, unity gain = 0 dB...

Not for the UMIK interface, unity gain = 0 dB which is at about 52% on the volume control.
Forum: Audio Theory, Setup, and Chat   06-06-2015, 01:50 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
By right clicking on the volume control. ...

By right clicking on the volume control.

759089
Forum: Audio Theory, Setup, and Chat   06-06-2015, 01:46 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Yes, fixed that, thanks.

Yes, fixed that, thanks.
Forum: Audio Theory, Setup, and Chat   06-06-2015, 01:46 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
I think the UMM-6 gain range is +12 dB at 100%...

I think the UMM-6 gain range is +12 dB at 100% down to -18 dB at 0, but best way to check is to set the volume control to display dB.
Forum: Audio Theory, Setup, and Chat   06-05-2015, 03:22 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
If the volume control is set to 100% when using a...

If the volume control is set to 100% when using a UMIK it applies 24 dB of digital gain. It is best used at the unity (0 dB) gain setting, for Windows 8 that is 52%, for Win7 and XP try 10%. At unity...
Forum: Audio Theory, Setup, and Chat   05-25-2015, 03:41 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Yes, much, much better for the measurements...

Yes, much, much better for the measurements without the sub. Measurements with the sub look like they are still clipping, but that isn't surprising as your sub level is far higher than the speaker....
Forum: Audio Theory, Setup, and Chat   05-24-2015, 11:39 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Set the meter so that it never quite reaches the...

Set the meter so that it never quite reaches the end stop during the measurement. On the 70 dB range you would need to make sure the level never exceeded about 76 dB throughout the measurement,...
Forum: Audio Theory, Setup, and Chat   05-24-2015, 11:15 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
No, the distortion is even worse in that...

No, the distortion is even worse in that measurement. What range do you have the meter set to? Does the meter needle stay below the upper end stop throughout the measurement?
Forum: Audio Theory, Setup, and Chat   05-24-2015, 10:03 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Measurement file indicates it was made with an RS...

Measurement file indicates it was made with an RS meter, should ignore everything above a few kHz. Also seems to be clipping somewhere in the measurement chain causing very high odd order harmonic...
Forum: Audio Theory, Setup, and Chat   04-10-2015, 02:36 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
To select an input and an output that are not on...

To select an input and an output that are not on the same device with ASIO4All it MUST be in Advanced mode, to get into Advanced mode click the wrench in the lower right corner, a red X then appears...
Forum: Audio Theory, Setup, and Chat   04-04-2015, 03:31 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
The output levels will make a difference if the...

The output levels will make a difference if the subs are arranged to try and counter room resonances, e.g. a pair symmetrically arranged to left and right or to front and back. For the modal...
Forum: Audio Theory, Setup, and Chat   03-17-2015, 02:44 AM
Replies: 20
Views: 595
Posted By JohnPM
You are. Again you are, and from the content...

You are.

Again you are, and from the content of your post my attempt to explain it to you is likely to prove futile, but I'll have a go anyway.

I'm more than familiar with Thiele Small - the...
Forum: Audio Theory, Setup, and Chat   03-16-2015, 03:18 PM
Replies: 20
Views: 595
Posted By JohnPM
That is why it was selected, it would be...

That is why it was selected, it would be difficult to illustrate a point about distortion by measuring something which didn't distort. The point was to show that under conditions of good signal to...
Forum: Audio Theory, Setup, and Chat   03-15-2015, 03:53 PM
Replies: 20
Views: 595
Posted By JohnPM
The difference is primarily in the signal to...

The difference is primarily in the signal to noise ratio, the noise floor is higher for the sweep which raises the distortion figures - how much depends on how high the noise floor is, using a longer...
Forum: Audio Theory, Setup, and Chat   03-09-2015, 01:12 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
If REW has previously detected the UMIK and been...

If REW has previously detected the UMIK and been pointed to the cal file it loads it up automatically, no point in bothering you for info it already has. And it's "he" rather than "they". :)
Forum: Audio Theory, Setup, and Chat   03-07-2015, 04:20 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Just go through the SPL calibration steps...

Just go through the SPL calibration steps (http://www.roomeqwizard.com/wizardhelpv5.1/help_en-GB/html/inputcal.html#top).
Forum: Audio Theory, Setup, and Chat   02-27-2015, 01:07 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
The UMIK-1 has two gain adjustments. One is...

The UMIK-1 has two gain adjustments.

One is the gain set by the internal DIP switches, which change the gain applied to the analog signal from the mic element. It would be unusual to need to...
Forum: Audio Theory, Setup, and Chat   02-10-2015, 12:27 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Here is one from the UMIK on my desk, the 120 Hz...

Here is one from the UMIK on my desk, the 120 Hz spike is from the fan on my PC. Overall level 49 dB.

538041
Forum: Audio Theory, Setup, and Chat   02-08-2015, 05:59 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
They should be much, much lower level unless the...

They should be much, much lower level unless the mic has a problem or is badly designed. There were a small batch of UMIKs that had similar levels due to a manufacturing error (see...
Forum: Audio Theory, Setup, and Chat   01-31-2015, 02:28 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Yes.

Yes.
Forum: Audio Theory, Setup, and Chat   01-31-2015, 01:38 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Sort of, it is mostly the effect of the FFT which...

Sort of, it is mostly the effect of the FFT which is used to generate the plot. The 50 dB (say) 'quiet' reading on an SPL meter is the total level summing across all frequencies. The waterfall plot...
Forum: Audio Theory, Setup, and Chat   01-31-2015, 03:12 AM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Levels in that waterfall look more than adequate...

Levels in that waterfall look more than adequate to me, there's no benefit from using higher levels for waterfall measurements.
Forum: Audio Theory, Setup, and Chat   12-12-2014, 01:18 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
That is incorrect. SEL is the accumulated total...

That is incorrect. SEL is the accumulated total sound energy over the measurement period, expressed as an equivalent constant level that would have the same energy if it lasted only one second. For...
Forum: Audio Theory, Setup, and Chat   12-01-2014, 12:43 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Thanks, I can see the problem now. The UMIK is...

Thanks, I can see the problem now. The UMIK is selected as the input device, but there is nothing selected as the input - and by the looks of it nothing there to select. Without a selection in the...
Forum: Audio Theory, Setup, and Chat   11-30-2014, 02:17 PM
Replies: 15,476
Views: 480,088
Posted By JohnPM
Not the best conditions for testing the SPL...

Not the best conditions for testing the SPL meter, since at very low levels you may (depending on the input volume setting) be below the lowest level for a 16 bit input (-96 dB FS) and/or above the...
Showing results 1 to 25 of 476

 
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