K-79 strange result after installing TI-diaphragm

[yngvejos]

Hi,

I tried to upgrade my KLF20's today by installing TI-Diaphragms in the tweeters.

I did a measurement before and after with the microphone 1m away from the speaker in tweeter level and have some strange results.

 

The green curve is the stock poly diaphragm, purple curve is TI. As you can see, the TI drops between 6-15KHz.

 

 

I tried measuring the other speaker and got this result. Again the green is stock and the purple TI. On this speaker, the response is similar to stock but a little uneven.

 

I have double checked that the diaphragm and horn is properly seated and that the wiring is correct. Both diaphragms are installed without gasket between diaphragm and horn since the gaskets was glued to the stock diaphragms. Can the missing gaskets cause this behavior?

 

[CANT]

Where did you get the diaphragms? I've seen QC issues like excessive glue cause stuff like this to happen.

[yngvejos]

I bought them from Simply speakers.

I contacted them and they recommended me to drill the holes for the pilot pins slightly larger to keep the voice coil from rubbing in the magnet gap.

I did that and got a lot of gain from 7-11kHz before it drops around 8dB and stays even to 22kHz. Is this normal response for the Ti diaphragm? Blue curve is Ti and red is poly. 

[avguytx]

So you didn't get them from Crites?  I thought the  only diaphragms recommended to use from Simply Speakers were the midrange Ti replacment diaphragms.