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Old 22nd April 2017, 11:10 PM   #541
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Allen,

I plan to add baffle step for my tabaq. I have 3 sets of baffle step to see which one I like best.

Yes, I should use a notch filter in the TABAQ but have no measurement tools so I can only guess looking at the frequency response provided by manufacturer. We will see if a notch is needed first.
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Old 6th May 2017, 04:20 PM   #542
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Old 6th May 2017, 08:34 PM   #543
AllenB is offline AllenB  Australia
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Thiele Small parameters are sometimes different to the spec sheet that you get with the driver. This doesn't matter much when you build a closed box. Most ordinary box building can be done with the factory parameters.

If you want to measure them you can use a multimeter or oscilloscope and audio generator to make your own impedance plot. You can also use your computer, and impedance measuring is useful for the impedance file used by a crossover simulator.

A real time spectrum analyser (avaliable as software) will make a plot, then you can use that to calculate things such as the driver resonance. Start with a 10 ohm resistor in a voltage divider with a much larger value (maybe 1000 ohms), and adjust until you get a flat plot of say, 10mV across the 10 ohm resistor, depending on the noise of your card. Then swap the resistor for your driver.
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Old 20th May 2017, 09:28 PM   #544
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Most manufacturers give parameters of broken in drivers though, don't they?

Cheers,
Anna
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Old 20th May 2017, 11:29 PM   #545
AllenB is offline AllenB  Australia
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I'm not sure, but I've seen manufacturing tolerance that is worse. The reason I'm not too concerned is that softening suspension increases compliance and hence the significance of a given closed volume, compensating the lower fs and Q in a feedback loop. Small Q variations can be equalised, and I'd expect to be making such adjustments at any rate.
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Old 25th May 2017, 07:48 AM   #546
gadut is offline gadut  Indonesia
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i just bought behringer ecm8000 and phantom supply to help me on this never been good sounding 12" and horn on OB. changed R L C value, I even changed different amplifier and still get bad recessed mid, dull treble. at one point i'm tired of another iteration, remembered on this post

Practical tips loudspeaker DIY

quotes that I always remember

"you equalize and flatten the wrinkles and at the end everything just does not sound like music at all. We must LET THE MIDBASS PLAY. Not limit it, not flatten it, not use notch filters or any manipulation by XO. Let's make it play the way it plays. If you do not like the way it sounds "naked", please change it"

I take out all my 12dB xo LPF and HPF, then mid 12" has no filter at all, horn tweeter only use 3.3uf caps and now I'm done with this setup, the result as expected

lesson learning today, with good driver sometimes simple is better.
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Old 25th May 2017, 11:32 AM   #547
AllenB is offline AllenB  Australia
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Experimentation helps...

I'm not sure this comment wasn't aimed at the baffle step.. a factor that you might find with OB and horn. The dispersion changes and the sound power in the room changes with respect to on-axis measurements. That is, the crossover changes depending on the dispersion, and the dispersion needs to be chosen to fit the application and to change smoothly and purposefully. This can only be confirmed by taking multiple measurements around the speaker and combining them.
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Old 25th May 2017, 11:22 PM   #548
tnargs is offline tnargs  Australia
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I don't think that you will have baffle step with open baffle bass.

Taken in isolation, that "memorable quote" is memorably bad. I could break it into parts and disagree with all of them. Would hate to think it is a learning point for someone. But context might change that.

Cheers
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Old 27th May 2017, 07:25 AM   #549
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by tnargs View Post
I don't think that you will have baffle step with open baffle bass.
Not exactly, my comment was referring to any inappropriate or sudden change in directivity.
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