Hello,
(Sorry to take the thread so late, I just come back from 1 week geological trip).
As it has been often said by David McBean himself, the directivity behaviour provided by Hornresp is just a rough evaluation.
The reason is because the hypothesis of a flat piston source is considered. As David used to say a BEM simulation will give more consistent results.
When we use a TD2001 on an axisymetrical and when we compare the prediction from Hornresp with real measurements we can see that the frequency response on axis extends flat at very high frequencies (wharever the cut-off of the horn). Then when we study directivity we can see that the real mesurements shows less beaming at high frequency than predicted (this lead me to think that the wavefront at the output of the TD2001 comrpession driver is more like a spherical cap ( = a dome)..
Best regards from Paris, France
Jean-Michel Le Cléac'h
(Sorry to take the thread so late, I just come back from 1 week geological trip).
As it has been often said by David McBean himself, the directivity behaviour provided by Hornresp is just a rough evaluation.
The reason is because the hypothesis of a flat piston source is considered. As David used to say a BEM simulation will give more consistent results.
When we use a TD2001 on an axisymetrical and when we compare the prediction from Hornresp with real measurements we can see that the frequency response on axis extends flat at very high frequencies (wharever the cut-off of the horn). Then when we study directivity we can see that the real mesurements shows less beaming at high frequency than predicted (this lead me to think that the wavefront at the output of the TD2001 comrpession driver is more like a spherical cap ( = a dome)..
Best regards from Paris, France
Jean-Michel Le Cléac'h
Thankyou Jean-Michel for joning the thread.
In your opinion what size horn would suit above the 180hz Le Cleac'h. This will have a Radian 950pb in it and run from 300hz up. I am open to wether a ET 703 tweeter is used as well as the TD2001, I am unsure as more is better but am heading in the direction of a TD2001 in a 350 or 400hz horn, then a et703 above.
In your opinion what size horn would suit above the 180hz Le Cleac'h. This will have a Radian 950pb in it and run from 300hz up. I am open to wether a ET 703 tweeter is used as well as the TD2001, I am unsure as more is better but am heading in the direction of a TD2001 in a 350 or 400hz horn, then a et703 above.
Hey 3GGG
I'm still wondering what you're going to do for bass, since this looks like it's heading towards a five-way to my mind . You've got yourself better integration from lower-mids to treble by using the 950pb, but what's going to happen when you cross to a big fluffy bass driver that can handle 45 to 300Hz ?
;o)
MJ
I'm still wondering what you're going to do for bass, since this looks like it's heading towards a five-way to my mind . You've got yourself better integration from lower-mids to treble by using the 950pb, but what's going to happen when you cross to a big fluffy bass driver that can handle 45 to 300Hz ?
;o)
MJ
Hello 3GGG,
This is a good idea IMHO. You should be using the 350 and 400Hz horn above 1500Hz and the ET703 above 8kHz.
But if you are listening at a sweet spot you should also try the 180Hz alone in a fist step, that's means the 180Hz free to reproduce the HF, with eventually a bit of HF equalization as in:
http://www.azurahorn.com/6681_on_160.pdf
Best regards from Paris, France
Jean-Michel Le Cléac'h
This is a good idea IMHO. You should be using the 350 and 400Hz horn above 1500Hz and the ET703 above 8kHz.
But if you are listening at a sweet spot you should also try the 180Hz alone in a fist step, that's means the 180Hz free to reproduce the HF, with eventually a bit of HF equalization as in:
http://www.azurahorn.com/6681_on_160.pdf
Best regards from Paris, France
Jean-Michel Le Cléac'h
Bass
You should also have a look at Martin Seddon's L-horns .
He started with bigger eg. Vitavox drivers but he's more impressed with the Lowther PM2A these days which takes him from about 50 to 800Hz in that horn !
http://www.azurahorn.com/gallery/160 plus Vitavox.jpg
http://www.azurahorn.com/gallery/425-50 005.jpg
MJ
You should also have a look at Martin Seddon's L-horns .
He started with bigger eg. Vitavox drivers but he's more impressed with the Lowther PM2A these days which takes him from about 50 to 800Hz in that horn !
http://www.azurahorn.com/gallery/160 plus Vitavox.jpg
http://www.azurahorn.com/gallery/425-50 005.jpg
MJ
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