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Old 16th August 2012, 09:14 AM   #1
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Default Help with calibration

Hi!
I use an active system on passive speakers.
This is the speakers. ~1000$
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The blue is the original passive filter i want to came close to. (don't mind the brown line.)
The mic also, is an cardioid and is not flat in it's response.
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This is my latest setup now with active filter and two amps, It sounds really good
but i wonder about the response. According to Lindqvist railey it should be increasing sum. Link
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I have also put some delay on the tweeter (measure). to put it on the same coil distance.
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And this is the miracle box
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Any hints for me? this is my first active setup.
Cheers!
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Old 16th August 2012, 12:01 PM   #2
VA2GXB is offline VA2GXB  Canada
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A key is to have the mic calibrated. I know it seems tiny, but Panasonic's WM61-A is used in many places as a measurement mic, and calibration files are readily available - check the response

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Old 16th August 2012, 12:11 PM   #3
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What you see is an interference dip around xover because of phase misalignment and that is why it doesn't sum properly. Play with the delay until it sums flat.
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Old 18th August 2012, 05:49 PM   #4
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Quote:
Originally Posted by vacuphile View Post
What you see is an interference dip around xover because of phase misalignment and that is why it doesn't sum properly. Play with the delay until it sums flat.
In fact 0,13ms is the setting i got from measure with mic.
The two drivers appear like just one when put on this delay
It its strange that the delay function give this measurment.
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Old 18th August 2012, 06:03 PM   #5
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Ahha now I have tried to measure with a dynamic microphone. A classic SM57.
And now I got one more expected response, so there was no problem with phase cancellation


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Old 18th August 2012, 06:05 PM   #6
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Quote:
Originally Posted by Viper_user View Post
In fact 0,13ms is the setting i got from measure with mic.
The two drivers appear like just one when put on this delay
It its strange that the delay function give this measurment.
I suggest reversing the phase on the tweeter make a new measurement. It will probably still not be good, but better. Just play around with the delay until it is straight.

The only other possibility is that you have a gap beteen the low pass and the high pass, but with a DSP and common sense that is unlikely,


vac
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Old 18th August 2012, 06:14 PM   #7
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And now to the interesting point. The difference from these speakers between the passive filter and active.

The sound is now very fixed and instruments are more placed in the image.
It was kind of diffusely before. A bit like you have turned on the light now.

It would be interesting to try this out on a couple of finer drivers some time.
Cheers!
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Old 18th August 2012, 06:20 PM   #8
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Quote:
Originally Posted by vacuphile View Post
I suggest reversing the phase on the tweeter make a new measurement. It will probably still not be good, but better. Just play around with the delay until it is straight.

The only other possibility is that you have a gap beteen the low pass and the high pass, but with a DSP and common sense that is unlikely,


vac
It was the human factor. My old measurment was not reliable
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Old 18th August 2012, 06:28 PM   #9
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And now the Phase when measure with a dynamic mic. (the lower line)


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