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Cone treatment to widen highs of fullrange driver?
Cone treatment to widen highs of fullrange driver?
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Old 24th January 2019, 10:14 AM   #1
wonderfulaudio is offline wonderfulaudio
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Default Cone treatment to widen highs of fullrange driver?

Hi,

TC9 is a very nice driver that has been proven in lots of designs from sealed to dipole to cardioids.
https://www.parts-express.com/pedocs...spec-sheet.pdf

However, it beams too much in the treble to be used in a constant directivity design. Is there a way to widen the highs in a well controlled fashion with treatment or something else.

Thanks,
WA
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Old 24th January 2019, 11:12 AM   #2
krakatoa is offline krakatoa  Romania
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Hi there, there is absolutely no way to make an existing cone have a different dispersion unless you would make it perfectly rigid (pistonic) - imposible - and then you get a point source like dispersion - this is because the dispersion is related to the geometry of the cone.
Another thing - the TC9 is a very well behaved unit when it comes to offaxis response. The BMR type of fullrange drivers are the best.
The general way you take care of such a problem is by adding something to take care of the dispersion - an acoustic lens of a kind or another - example: DCT-1 | Parts Express Project Gallery ; the more popular thing is to make an Karlsonator type enclosure that has an acoustic lens build in.
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Old 24th January 2019, 11:26 AM   #3
kokoriantz is offline kokoriantz  Lebanon
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You can built an acoustic lens . As on axis is about +6db , the lens will attenuate but widen the angle . See JBL acoustic lenses.
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Old 24th January 2019, 04:01 PM   #4
Lohengrimas is offline Lohengrimas  Netherlands
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Quote:
Originally Posted by kokoriantz View Post
You can built an acoustic lens . As on axis is about +6db , the lens will attenuate but widen the angle . See JBL acoustic lenses.
yes, but, as a subspecies of horn, would the acoustic lens only have effect on a specific "three octave" band of frequencies? If so, yes, you could build one for the range above which the driver starts to beam, but to boost the high end freq. response in a driver already known for strident highs...

No free lunch in audio, I guess
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Old 24th January 2019, 04:35 PM   #5
kokoriantz is offline kokoriantz  Lebanon
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The lens is the sandwich of foils without the horn . Normally it is used in front of small speaker-twitter in low cost loudspeakers . The spacing of foils determines the highest frequency where the depth the lowest .
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Old 24th January 2019, 04:45 PM   #6
turk 182 is offline turk 182  Canada
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that got to be the worst explanation of how a JBL lens works...and those ain't cheap, if you can find them used...
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Old 25th January 2019, 01:07 AM   #7
kokoriantz is offline kokoriantz  Lebanon
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You need to build such lens .
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Old 25th January 2019, 01:10 AM   #8
adason is offline adason  United States
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Quote:
Originally Posted by wonderfulaudio View Post
Hi,

TC9 is a very nice driver that has been proven in lots of designs from sealed to dipole to cardioids.
https://www.parts-express.com/pedocs...spec-sheet.pdf

However, it beams too much in the treble to be used in a constant directivity design. Is there a way to widen the highs in a well controlled fashion with treatment or something else.

Thanks,
WA
...add tweeter.

MTM with TC9fd

Last edited by adason; 25th January 2019 at 01:13 AM.
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Old 25th January 2019, 01:25 AM   #9
perceval is offline perceval  Taiwan
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Quote:
Originally Posted by adason View Post
...add tweeter.

MTM with TC9fd
That.

Everything else is a bandaid patch that will yield less than great results.
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Old 25th January 2019, 04:43 AM   #10
ghemml is offline ghemml  Singapore
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Add a whizzer cone might help.
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