DSP Xover project (part 2) - Page 53 - diyAudio
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Old 9th January 2013, 01:14 PM   #521
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When and how will you be taking orders ?
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Old 9th January 2013, 01:47 PM   #522
chaparK is offline chaparK  Luxembourg
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Quote:
Originally Posted by alugner View Post
Do You have any estimation for the duration of the beta tests? Will You keep us outside this beta circle informed of the progress?

I guess the tests are all about software. Is there any risk of hardware revisions?
It's hard to estimate how long the 2 beta testers are going to take.
But both are members of this forum so we can curse them if they're taking too long

Testing is only for software/firmware. No risk of hardware revision.

Quote:
Originally Posted by dahlberg View Post
When and how will you be taking orders ?
The boards are going to be available pretty soon - this time I have a tracking number. Before shipping I'll need to check that it's all fine on the HW standpoint and we'll see what beta testers are reporting.

On the HW standpoint I'm not expecting any problem as the product has gone successfully through the whole development cycle: prototype and production sample.
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Old 9th January 2013, 11:13 PM   #523
chaparK is offline chaparK  Luxembourg
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Here's a screenshot of the monitor (under Windows): Level meters, status and controller.

monitor1.png
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Old 10th January 2013, 06:09 PM   #524
chaparK is offline chaparK  Luxembourg
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Here's another screenshot (still under Windows) showing the plotting section. I have loaded here the unprocessed responses of 2 drivers: a woofer on channel 1 and a tweeter on channel 4.

graph1.png

Well, let's say now that we want a FIR network crossing a 1kHz. The application will display the expected outcome for each channel separately.

graph2.png

It can also display the electrical sum. I have here slightly boosted the woofer.

graph3.png

The above is not a proper strategy example for setting up a crossover - it's just a simple case that lets me testing the plotting utility. Note also that some details such as colors might change before the software release
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Old 10th January 2013, 06:31 PM   #525
Ryssen is offline Ryssen  Sweden
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Is it possible to invert the phase of the channels?
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Regards Åke
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Old 10th January 2013, 07:21 PM   #526
jcga is offline jcga  France
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Quote:
Originally Posted by chaparK View Post
Well, let's say now that we want a FIR network crossing a 1kHz. The application will display the expected outcome for each channel separately.

Attachment 323028
Why the asymmetric slope ? the number of tap ?
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Old 11th January 2013, 08:35 AM   #527
chaparK is offline chaparK  Luxembourg
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Quote:
Originally Posted by Ryssen View Post
Is it possible to invert the phase of the channels?
Yes absolutely possible.

Quote:
Originally Posted by jcga View Post
Why the asymmetric slope ? the number of tap ?
Again, the example above is not a proper setup in any way (the 1kHz crossing frequency is itself questionable).

These filters are 127-tap FIRs. They are voltage-complementary and perfectly symmetrical ... on a plot that uses linear scales.
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Old 11th January 2013, 08:51 AM   #528
jcga is offline jcga  France
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Quote:
Originally Posted by chaparK View Post
Yes absolutely possible.

Again, the example above is not a proper setup in any way (the 1kHz crossing frequency is itself questionable).

These filters are 127-tap FIRs. They are voltage-complementary and perfectly symmetrical ... on a plot that uses linear scales.
It was perfectly clear to me that 1 KHz was not the appropriate cut off freq in this case and I know that depending on filter type, you should not take the first octave slope as a reference.
I probably miss something but according to the plot, we have an almost 24dB/octave slope for the high pass and a lot of more for the low pass...

Best regards from France
JC
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Old 11th January 2013, 08:57 AM   #529
chaparK is offline chaparK  Luxembourg
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Quote:
Originally Posted by chaparK View Post
They are voltage-complementary and perfectly symmetrical ... on a plot that uses linear scales.
Quote:
Originally Posted by jcga View Post
[...] according to the plot, we have an almost 24dB/octave slope for the high pass and a lot of more for the low pass...
This is the explanation. But again, let's not argue about these filters specifically.
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Old 11th January 2013, 07:14 PM   #530
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Hi Nick,

I noticed you are using .nsf files, what about other files like (ie. .pir ARTA files) ?

Is there any chance to apply settings both (all) channels live ?

Regards,
Alex.
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