Hornresp

[AndrewT]

post1367.
The divide by 10 in the plot.
Does that mean that @ 100Hz the graph is showing displacement ~14mm one way and = 28mm peak to peak?

[mige0]

Originally Posted by David McBean

I suspect that the problem may be with your system :-). No-one else has reported similar issues and as you can see from my earlier attachment, the capture feature normally also works with the Diaphragm Displacement chart.

No wonder - I have to apologize - its all been me, myself and I


Thanks for the answers to all other questions.

Michael

[David_Web]

It would be 0.14mm one way
1.4 / 10

[Don Hills]

David,

Hornresp appears to vertically scale the calculation result graphs automatically. While this is very convenient, it can lead to problems. For example, if the speaker has a high inductance, the electrical impedance can rise to a very high value at 20 KHz. This means the LF resonance impedance peaks are tiny bumps at the bottom of the graph. To see what I mean, pick any speaker and add 10 mH to its Le value. Then Calculate and display the electrical impedance graph. It's particularly bad on Volvotreter's Tang Band 38 Hz Tapped horn.

In my opinion, a solution that should suit novice and power users alike would be a slider beside the graph, allowing adjustment of the vertical scale. Just a suggestion...

... or maybe an option to limit the frequency range. I notice that the Loudspeaker Wizard graphs only go to 2 kHz or so, reducing the effects of the aforementioned impedance rise.

[Kolbrek]

Don,

In the Electrical Impedance window, select Tools -> Range to select a different graph range. The 'Zoom' option fits the scale to the resonance peak(s). It's explained in the help file.

Bjørn

[AndrewT]

Originally Posted by AndrewT

post1367.
The divide by 10 in the plot.
Does that mean that @ 100Hz the graph is showing displacement ~14mm one way and = 28mm peak to peak?

Originally Posted by David_Web

It would be 0.14mm one way
1.4 / 10

which is it?
Have the results been plotted after the software has divide by 10 or as David suggests, the user divides what is shown by 10?

[Don Hills]

Originally Posted by Kolbrek

Don,

In the Electrical Impedance window, select Tools -> Range to select a different graph range. The 'Zoom' option fits the scale to the resonance peak(s). It's explained in the help file.

Bjørn

Thanks, Bjørn.
Everything I asked for, already there. And I pride myself on "Reading The Manual"... How embarrassing.

[David McBean]

Originally Posted by AndrewT

Have the results been plotted after the software has divide by 10 or as David suggests, the user divides what is shown by 10?

Hi Andrew,

For the example you quoted, the user should divide Y-axis displacement values by 10.

When in doubt the Sample tool can always be used to check actual values. See the screenprint below and the Diaphragm Displacement description on page 6 of the Help file.

Kind regards,

David

[David McBean]

Hi Don,

Just to complete the picture - the Range tool can also be used with the Group Delay chart.

Kind regards,

David

[David McBean]

Originally Posted by mige0

Thanks for the answers to all other questions.

Hi Michael,

You're welcome :-).

One thing I should have perhaps clarified in my earlier message - the loudspeaker will only see a constant frequency-independent input voltage of Eg if the amplifier output resistance Rg is set to the default value of zero ohms.

Kind regards,

David