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Forum: Audio theory, Setup and Chat   10-07-2014, 12:24 PM
Replies: 12,049
Views: 324,063
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: 784
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: 784
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: 12,049
Views: 324,063
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: 12,049
Views: 324,063
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: 12,049
Views: 324,063
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: 12,049
Views: 324,063
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: 12,049
Views: 324,063
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...
Forum: Audio theory, Setup and Chat   06-24-2014, 03:36 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
You seem to be getting time and frequency signals...

You seem to be getting time and frequency signals a bit confused here, perhaps as a result of plots like the waterfall that combine the two. Apologies if what follows is teaching grandma to suck...
Forum: Audio theory, Setup and Chat   06-24-2014, 03:07 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Spectrogram or waterfall with suitably configured...

Spectrogram or waterfall with suitably configured windows are better tools for that.
Forum: Audio theory, Setup and Chat   06-24-2014, 12:47 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
You can't compare signals which are individually...

You can't compare signals which are individually normalised as each has been scaled up by a different amount according to the peak value in that signal. Viewing filtered time signals is not a good...
Forum: Audio theory, Setup and Chat   06-23-2014, 12:21 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
No, there is nothing 'compromised' about them,...

No, there is nothing 'compromised' about them, they accurately reflect the effect of the filter.

Not if you turn off normalisation, it would not be meaningful to compare traces that have different...
Forum: Audio theory, Setup and Chat   06-21-2014, 04:46 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
%FS is percentage of full scale. It is a linear...

%FS is percentage of full scale. It is a linear axis, so if the value it is showing is halved the trace would only go up half as far. A linear Y axis is common with time signals, unless there is a...
Forum: Audio theory, Setup and Chat   06-20-2014, 04:02 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
The envelope of a time signal doesn't favour...

The envelope of a time signal doesn't favour anything, it simply reflects the signal's content. You are perhaps being misled by the logarithmic dB scaling and normalisation. Try looking at the...
Forum: Audio theory, Setup and Chat   06-20-2014, 03:14 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Most things are possible, not clear what that...

Most things are possible, not clear what that would achieve though? The main purpose of the fractional octave filtering of the IR is to examine the rate of decay in the different bands, that is not...
Forum: Audio theory, Setup and Chat   06-19-2014, 10:56 AM
Replies: 12,049
Views: 324,063
Posted By JohnPM
The bandpass filters specified in ISO 3382 have...

The bandpass filters specified in ISO 3382 have phase shift and hence time delay. The Time Reversed Filtering option reduces this, from the help:

The Time Reversed Filtering control applies the...
Forum: Audio theory, Setup and Chat   05-31-2014, 03:57 AM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Quote:Originally Posted by...

Quote:Originally Posted by 3ll3d00d http://www.avsforum.com/img/forum/go_quote.gif...
Forum: Audio theory, Setup and Chat   05-29-2014, 12:47 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Quote:Originally Posted by...

Quote:Originally Posted by mijotter http://www.avsforum.com/img/forum/go_quote.gif...
Forum: Audio theory, Setup and Chat   05-16-2014, 12:50 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Quote:Originally Posted by...

Quote:Originally Posted by AustinJerry http://www.avsforum.com/img/forum/go_quote.gif...
Forum: Audio theory, Setup and Chat   05-01-2014, 01:35 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Quote:Originally Posted by...

Quote:Originally Posted by sdrucker http://www.avsforum.com/img/forum/go_quote.gif...
Forum: Audio theory, Setup and Chat   05-01-2014, 01:08 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Quote:Originally Posted by...

Quote:Originally Posted by Aarghon http://www.avsforum.com/img/forum/go_quote.gif...
Forum: Audio theory, Setup and Chat   11-12-2013, 01:53 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Herb stopped shipping the UMM-6 outside the US...

Herb stopped shipping the UMM-6 outside the US because too many were breaking during shipping. See this post...
Forum: Audio theory, Setup and Chat   10-28-2013, 12:45 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Quote:Originally Posted by...

Quote:Originally Posted by AustinJerry http://www.avsforum.com/img/forum/go_quote.gif...
Forum: Audio theory, Setup and Chat   09-27-2013, 01:16 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Quote:Originally Posted by...

Quote:Originally Posted by garygarrison http://www.avsforum.com/img/forum/go_quote.gif...
Forum: Audio theory, Setup and Chat   09-18-2013, 12:25 PM
Replies: 12,049
Views: 324,063
Posted By JohnPM
Quote:Originally Posted by...

Quote:Originally Posted by stef2 http://www.avsforum.com/img/forum/go_quote.gif...
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