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Search: Posts Made By: JohnPM
Forum: Audio Theory, Setup, and Chat   04-10-2015, 02:36 PM
Replies: 14,786
Views: 460,074
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: 14,786
Views: 460,074
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: 534
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: 534
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: 534
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: 14,786
Views: 460,074
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: 14,786
Views: 460,074
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: 14,786
Views: 460,074
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: 14,786
Views: 460,074
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: 14,786
Views: 460,074
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: 14,786
Views: 460,074
Posted By JohnPM
Yes.

Yes.
Forum: Audio Theory, Setup, and Chat   01-31-2015, 01:38 PM
Replies: 14,786
Views: 460,074
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: 14,786
Views: 460,074
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: 14,786
Views: 460,074
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: 14,786
Views: 460,074
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: 14,786
Views: 460,074
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...
Forum: Audio Theory, Setup, and Chat   11-12-2014, 05:52 AM
Replies: 14,786
Views: 460,074
Posted By JohnPM
ASIO4All needs to be in Advanced mode to select...

ASIO4All needs to be in Advanced mode to select inputs/outputs from different soundcards/devices, you may need to click the wrench/spanner to put it in Advanced mode.
Forum: Audio Theory, Setup, and Chat   10-07-2014, 12:24 PM
Replies: 14,786
Views: 460,074
Posted By JohnPM
If you are using ASIO4All then you need to be in...

If you are using ASIO4All then you need to be in the Advanced Settings mode to have multiple devices active, click the spanner/wrench to turn on the advanced mode.
Forum: Audio Theory, Setup, and Chat   09-23-2014, 12:55 AM
Replies: 14
Views: 921
Posted By JohnPM
Hi Garidy, So the 'electrical' measurements...

Hi Garidy,

So the 'electrical' measurements are on the terminals of the speaker with the speaker still attached? Would be interesting to see a dummy load in place of the speaker, to see the...
Forum: Audio Theory, Setup, and Chat   09-22-2014, 02:08 PM
Replies: 14
Views: 921
Posted By JohnPM
The group delay, THD and impedance plots have...

The group delay, THD and impedance plots have different axis settings between wired and unwired making them difficult to compare, but look pretty identical other than that. Don't forget that the THD...
Forum: Audio Theory, Setup, and Chat   07-31-2014, 11:06 AM
Replies: 14,786
Views: 460,074
Posted By JohnPM
Yes they are, they just have a linear amplitude...

Yes they are, they just have a linear amplitude axis (% FS) instead of log (dB FS).
Forum: Audio Theory, Setup, and Chat   06-25-2014, 03:22 PM
Replies: 14,786
Views: 460,074
Posted By JohnPM
The data is right, it is your interpretation of...

The data is right, it is your interpretation of it that is wrong :)

Applying a filter to a time signal doesn't turn it into a frequency domain signal, it is still a time signal, you are trying to...
Forum: Audio Theory, Setup, and Chat   06-25-2014, 01:54 PM
Replies: 14,786
Views: 460,074
Posted By JohnPM
Part of the problem is that this is not possible....

Part of the problem is that this is not possible. It is meaningless to ask "what is the frequency of the sample 10ms after the peak", for example, because a single sample of a time signal can't have...
Forum: Audio Theory, Setup, and Chat   06-25-2014, 01:04 PM
Replies: 14,786
Views: 460,074
Posted By JohnPM
Can you post one of your measurement mdat files? ...

Can you post one of your measurement mdat files?

It is the sweep which spans extra octaves, not the filter - e.g. if you ask REW to measure from 500 Hz to 1500 Hz it will generate a sweep that...
Forum: Audio Theory, Setup, and Chat   06-25-2014, 11:26 AM
Replies: 14,786
Views: 460,074
Posted By JohnPM
I'm not sure you have. Measurement sweeps start...

I'm not sure you have. Measurement sweeps start an octave below the range of interest and end an octave above, so the impulse responses reflect a broader frequency span than the range displayed. That...
Showing results 1 to 25 of 467

 
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