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Multi-Way Conventional loudspeakers with crossovers

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Old 25th August 2010, 11:32 AM   #7291
sendler is offline sendler  United States
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Default Waves

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Originally Posted by soongsc View Post
I thought "harmonic" was a frequency domain thing.
Harmonic is a wave thing.
Physics Tutorial: Guitar String Harmonics
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Old 25th August 2010, 01:30 PM   #7292
soongsc is offline soongsc  Taiwan
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So, it should show up in frequency domain which does not seem to be the case.
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Old 25th August 2010, 03:40 PM   #7293
Paul W is offline Paul W  United States
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Originally Posted by soongsc View Post
Diffraction is quite obvious. It would be interesting to see a CSD.
What we both thought was diffraction turned out to be reflection from a projector box hanging from the ceiling...I moved the mic into a position to "see" the reflection...oops! Pretty sure there is a CSD plot in the thread.
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Old 25th August 2010, 04:47 PM   #7294
sendler is offline sendler  United States
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So, it should show up in frequency domain which does not seem to be the case.
So I guess this is another example of the very sensitive wavelet transform showing us something that is so minor that we won't hear it.
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Old 25th August 2010, 04:57 PM   #7295
soongsc is offline soongsc  Taiwan
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Originally Posted by Paul W View Post
What we both thought was diffraction turned out to be reflection from a projector box hanging from the ceiling...I moved the mic into a position to "see" the reflection...oops! Pretty sure there is a CSD plot in the thread.
Referring to the plots below, if it were a projector box, I would have expected all curve to show the same wriggles. If you were moving the mic to do off-axis measurements, then it would be a different story. I just assumed one would rotate the speaker.
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Originally Posted by g3dahl View Post
Just read the thread on htguide. Below is just the horn and driver at 2 m, at 0, 10, 20, 30 and 40 degrees off axis. Paul said that the deep notch at 14 kHz didn't happen with his other ND1460A's on his own waveguides.

Click the image to open in full size.

And here is the woofer response:

Click the image to open in full size.

It's an interesting thread. Paul did impressive work to integrate the system so nicely. Wish I could take a listen.

Here's the thread: HTGuide Forum - The Raptor ... a 10" MTM

Gary Dahl
Hmm, looked through that thread. The CSD of the horn looked nice, wonder what happened when it got integrated with the system.
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Last edited by soongsc; 25th August 2010 at 05:04 PM.
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Old 29th August 2010, 08:52 PM   #7296
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Lynn
You asked a few days ago about the Onken/Jensen cabinets I'm making .
The design is basically the standard design as given on the Supravox site :
http://www.supravox.fr/kits/jensen.pdf

I looked for a while at alternative alignments but could see the inevitable trade-offs of low-end extension . I'm not intending to add any further bass complexity due to space considerations . I'm hoping it will be an OK trade-off with the nice Supravox 285GMF which have very light cones .
The current philosophy will be to drive these bass speakers from a Pass F4 driven from a valve linestage or a pick-off from the driver of the SE amp that will be driving the Horns and G3 ribbons . I'm hoping the Class-A and feedbackless nature of the F4 will help integration between bass and mid sections . I should at least get the same sort of spatiality from the F4 as a valve SE amp .

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Old 8th September 2010, 06:01 AM   #7297
mige0 is offline mige0  Austria
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Originally Posted by phi View Post
Michael !

Would't it be a good idéa to make a document (which you seem to like to do) with your CMP theories and put that at your place "Audio and Loudspeaker Design Guidelines".
Per
Excellent idea ! - where did I have my thoughts ?


...
Michael
For what it is worth - enjoy !


http://www.kinotechnik.edis.at/pages...ts_of_View.pdf


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Old 9th September 2010, 05:37 PM   #7298
mige0 is offline mige0  Austria
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No longer hijacking this thread with "shuddering" topics...

„CMP framing“ – what the ** you mean ?


Last edited by mige0; 9th September 2010 at 05:40 PM.
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Old 9th September 2010, 05:43 PM   #7299
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Any more news on Gary's progress?
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Old 9th September 2010, 08:50 PM   #7300
g3dahl is offline g3dahl  United States
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I can give a quick update...

The low pass filter for the TD15M is finished and came out beautifully (in terms of the rolloff shape, IR and CSD). The high pass filter for the Radian 745 is in progress. The circuit has been simmed but not yet built. I was waiting for some autoformers and custom inductors from dave slagle (Intact Audio) and other various parts, but everything's here now. I will have a chance to put them together and run some tests this weekend.

With any luck, I'll get to hear some music through them very soon! (getting tired of test signals...)

Gary Dahl
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