deceptive perception ? 1st order-2nd order question - diyAudio
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Old 10th April 2007, 08:22 PM   #1
poldus is offline poldus  Europe
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Post deceptive perception ? 1st order-2nd order question

Has anybody experienced a more prominent treble content in the overall sound when converting a tweeter crossover from first order high pass to second order (by adding a 0.2 coil in parallel after the 2.2 series capacitor) ?

If so, could you explain how this might happen?

Perhaps the brain notices the highest frequencies more because there is now a greater dip between them and the mid-woofers output?
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Old 10th April 2007, 08:25 PM   #2
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Possibly now you have a high-Q tweeter response. How did you design your crossover?
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Old 10th April 2007, 09:28 PM   #3
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Thanks for your pront response.

Im using a foster ribbon tweeter.

This is my first diy speaker and started with a capacitor in series because its the simplest. I have no previous x-over design knowledge-other than what Ive gleaned from this forum.

I was hearing some harsh strings in symphonic music which I wanted to smooth out while retaining the very high frequency details. ( I listen to SACD mostly). A series resistor did not achieve both goals. The coil did. And as I said, hearing the subjective stronger treble presence has baffled me.

Does a higher Q mean a narrower peak in the response?
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Old 10th April 2007, 10:04 PM   #4
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It means the response peaks up before the roll-off region. 2nd-order and higher filters can peak in this way if not designed properly.
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Old 10th April 2007, 11:58 PM   #5
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So the output at a particular frequency point is actually stronger than before. That sure explains what I am hearing. Most interesting. Thanks for clarifying.
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