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Netlist 3rd November 2006 02:00 PM

Calling SpeakerWorkshop aficionados.
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After trying for many days now to get Speakerworkshop to work I still don’t get much more out of it then bad calibration data.
I use Claudio’s tutorial , gave up on Wallins jig and just soldered some cables exactly like Claudio has done.
I’m stuck on the channel difference calibration procedure and this is how his and my graph compare.
Soundcard is SBLive which should be able to handle the job.
Any help highly appreciated.


Netlist 3rd November 2006 02:01 PM

2 Attachment(s)
My graph:

Ron E 3rd November 2006 03:07 PM

What sample frequency are you using? I believe the only one the SB live can actually do is 48Khz. every other sample rate is resampled to that.

soongsc 3rd November 2006 03:20 PM

What do your sine wave and loop back recording look like. From you graphs I would guess it's either the sample rate or the signal levels.

Netlist 3rd November 2006 03:59 PM

2 Attachment(s)
Sample rate is 48khz. Sample size is 256k.
I have set the recording level to 100% and the Master volume at about 60% which gives me about 15.2k in the VU meter. Sine wave looks fine.
Without touching anything, I try calibrating the channel difference and the graph now looks like the picture and VU meter is at 28k.
I managed to get a flat phase line with the Interchannel time delay a starter. :)


Netlist 3rd November 2006 04:27 PM

2 Attachment(s)
Here's another set of graphs that might shed some light.
I'm worried about the ‘measurement output’. I still need to familiarize myself with SW so I don't know how to interpret it but it sure looks distorted.


soongsc 4th November 2006 01:37 AM

2 Attachment(s)
I haven't used SW for some time. The first thing we normally do is to use RMAA to test the card just to make sure it's okay. If you can get RMAA to test right, then your chances are better.

When you generate the fft, do you use "entire range"? or do you use a specific range.
What have you not muted in the Windosws master recording volume?

I've attached some stuff from my last calibration.

If you are planning to do acoustic testing, you know you will need to adjust the levels acordingly.

Netlist 4th November 2006 02:58 PM

Thanks, I did the step by step procedure as described by Claudio.
Meanwhile, I reached the next steps like impedance calibration but they all show weird values like negative ohmic measurements.
I'll give it a rest for a while as I'm not able to get consistent results; a must for accurate measurements.


soongsc 4th November 2006 03:13 PM

I don't know whether your sound card has latency settings or not. But if it does, you can try to increase it so that there is a larger buffer. This may let you get consistent impulse location.

Netlist 4th November 2006 05:51 PM

Sound card has no latency setting that I'm aware of.
Anyway, I'll report back when I find the time to get on with the darn thing. :)


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