ML-TL question: Meaning of dip at "Woofer and Terminus Far Field SPL"

JC Fardo · 13th February 2004, 09:02 PM

HI

I´m playing with MathCad 8 free demo. Enclosure is similar to Ariels but with MT Vifa PL18 configuration. Infinite Baffle SPL is nice with gradual rolloff.

Driver measured Fs: 38Hz, dip is at at 35HZ. Also first peak from Acoustic Impedance graphic is at 35Hz, and I really don´t know if this result is fine.

Thanks in advance for comments.

JC

Timn8ter · 13th February 2004, 11:49 PM

I believe the dip conicides with the impedance rise of the driver. This is normal. What you want to be concerned with are the ripples higher up. Here's a thread with MJKs explanations.
Perfect TL with MJK mathcad graph?

JC Fardo · 14th February 2004, 02:10 PM

Hi Tinm8ter

Thanks for reply.

In impendance graphic first peak is at 35Hz

Driver Fs is 38Hz so it´s 3Hz lower. Any problem?

TIA
JC

JC Fardo · 14th February 2004, 02:20 PM

Hi Timn8ter

Sorry. The answer is on the thread you have post

BTW nice page yours

TIA, JC

13th February 2004, 09:02 PM	#1
JC Fardo diyAudio Member Join Date: Jun 2002 Location: Sao Paulo, SP, Brazil	ML-TL question: Meaning of dip at "Woofer and Terminus Far Field SPL" HI I´m playing with MathCad 8 free demo. Enclosure is similar to Ariels but with MT Vifa PL18 configuration. Infinite Baffle SPL is nice with gradual rolloff. Driver measured Fs: 38Hz, dip is at at 35HZ. Also first peak from Acoustic Impedance graphic is at 35Hz, and I really don´t know if this result is fine. Thanks in advance for comments. JC

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13th February 2004, 11:49 PM	#2
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	I believe the dip conicides with the impedance rise of the driver. This is normal. What you want to be concerned with are the ripples higher up. Here's a thread with MJKs explanations. Perfect TL with MJK mathcad graph?

14th February 2004, 02:10 PM	#3
JC Fardo diyAudio Member Join Date: Jun 2002 Location: Sao Paulo, SP, Brazil	Hi Tinm8ter Thanks for reply. In impendance graphic first peak is at 35Hz Driver Fs is 38Hz so it´s 3Hz lower. Any problem? TIA JC

14th February 2004, 02:20 PM	#4
JC Fardo diyAudio Member Join Date: Jun 2002 Location: Sao Paulo, SP, Brazil	Hi Timn8ter Sorry. The answer is on the thread you have post BTW nice page yours TIA, JC

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