Need help with fountek cd 2.0

Wirezz · 28th January 2012, 12:12 AM

Hi I m really new to ribbons. Bought a fountek neo CD 2.0 to pair with a seas M15Ch002. However the measurements I get off the fountek look nothing like in the product literature. there is a drop of 10 db between 3k and 10 k.. I am testing the fountek with a 10uF cap in line with a T amplifier. Am I doing something wrong here? Any help would really be appreciated.

Wirezz · 28th January 2012, 09:27 AM

switched to a 30uf cap.... still the same curve. anyone got any ideas ?

jerome69 · 28th January 2012, 11:14 AM

No, it works with 10uF...

system7 · 28th January 2012, 12:52 PM

You say a "T amplifier"? Does that mean a Class D that interacts with load impedance? AFAIK the CD2 has a rising impedance at HF from 7 ohms.

I'd try padding the NeoCD2.0 ribbon tweeter with 4 ohms in series, 8 ohms shunt and remeasuring. But keep the level low!

Usually people use 3rd order crossovers with this fragile rose. It hates DC or anything close to it.
DIY Loudspeaker Projects Troels Gravesen

As you say, normal behaviour is a slight increasing brightness at higher frequencies with Founteks. I expect it is quite sensitive to the source impedance driving it, especially as it has a transformer built in.

28th January 2012, 12:12 AM	#1
Wirezz diyAudio Member Join Date: Nov 2011	Need help with fountek cd 2.0 Hi I m really new to ribbons. Bought a fountek neo CD 2.0 to pair with a seas M15Ch002. However the measurements I get off the fountek look nothing like in the product literature. there is a drop of 10 db between 3k and 10 k.. I am testing the fountek with a 10uF cap in line with a T amplifier. Am I doing something wrong here? Any help would really be appreciated.

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28th January 2012, 09:27 AM	#2
Wirezz diyAudio Member Join Date: Nov 2011	switched to a 30uf cap.... still the same curve. anyone got any ideas ?

28th January 2012, 11:14 AM	#3
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	No, it works with 10uF...

28th January 2012, 12:52 PM	#4
system7 diyAudio Member Join Date: Aug 2008	You say a "T amplifier"? Does that mean a Class D that interacts with load impedance? AFAIK the CD2 has a rising impedance at HF from 7 ohms. I'd try padding the NeoCD2.0 ribbon tweeter with 4 ohms in series, 8 ohms shunt and remeasuring. But keep the level low! Usually people use 3rd order crossovers with this fragile rose. It hates DC or anything close to it. DIY Loudspeaker Projects Troels Gravesen As you say, normal behaviour is a slight increasing brightness at higher frequencies with Founteks. I expect it is quite sensitive to the source impedance driving it, especially as it has a transformer built in.

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