Is This Small Peak A Problem?

Jay · 28th April 2011, 02:19 PM

Attached is a simulation of a 3-way that I have not yet built. Look at the small peak around 5K. This is theoretically caused by phase irregularity of the midwoofer, which may exist only in simulation (or not?). The midwoofer response itself is well down a few dB.

I don't feel comfortable with this peak. Is this peak normal, or something wrong with the interpolation that I made? Is this audible?

badman · 28th April 2011, 04:02 PM

Not worth worrying about IMO.

Jay · 28th April 2011, 04:02 PM

If you look at the amplitude of the peak, you will think that it is just a safe 1dB. But when you look at the shape, it's like port resonance...

speaker dave · 28th April 2011, 08:15 PM

If you are talking about the very sharp feature in the system curve (black curve), I don't think that is real. Note that the red curve (tweeter only) does not have that feature and I don't see how the woofer could be causing it either. I am guessing that it is some sort of calculation artifact from your software.

David

Jay · 29th April 2011, 03:37 AM

Quote:

Originally Posted by speaker dave

If you are talking about the very sharp feature in the system curve (black curve), I don't think that is real. Note that the red curve (tweeter only) does not have that feature and I don't see how the woofer could be causing it either.

David

Yes, the tweeter response is smooth. The woofer response is quite okay also. But the phase of the woofer starts to become "irregular" less than 1 octave from the crossover point.

Looking from the woofer response curve around 5K, I think I "SPL-traced" it (I don't remember because I didn't give proper name to my FRD files). And I'm not sure whether the end SPL response is on-axis or off-axis. Thus the phase response is also an interpolation (a big approximation). I don't know if in reality the phase response is like that or not.

Hopefully, this is something that is not critical. I use this method of "approximation" because I know that I would rely more on my ears than the software, so I didn't think that precision is an issue.

AllenB · 30th April 2011, 12:19 AM

If you think that's significant, take a look at it above and below axis.

Jay · 30th April 2011, 12:54 AM

Hmmm... okay so I suppose this is okay as I thought. I just never seen something like this from my other files, or from some charts on the net.

Thanks everyone.

28th April 2011, 04:02 PM	#2
badman Custom Title diyAudio Member Join Date: Sep 2003 Location: Sunny Tustin, SoCal	Not worth worrying about IMO. __________________ I write for www.enjoythemusic.com in the DIY section. You may find yourself getting a preview of a project in-progress. Be warned!

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28th April 2011, 04:02 PM	#3
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	If you look at the amplitude of the peak, you will think that it is just a safe 1dB. But when you look at the shape, it's like port resonance...

28th April 2011, 08:15 PM	#4
speaker dave diyAudio Member Join Date: Nov 2009 Location: Toronto	If you are talking about the very sharp feature in the system curve (black curve), I don't think that is real. Note that the red curve (tweeter only) does not have that feature and I don't see how the woofer could be causing it either. I am guessing that it is some sort of calculation artifact from your software. David

30th April 2011, 12:19 AM	#6
AllenB diyAudio Member Join Date: Oct 2008	If you think that's significant, take a look at it above and below axis.

30th April 2011, 12:54 AM	#7
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	Hmmm... okay so I suppose this is okay as I thought. I just never seen something like this from my other files, or from some charts on the net. Thanks everyone.

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