Hi guys. I've ordered some cheap caps so that I can test before investing in some really decent ones, but I've been looking at the crossover frequency for the 2 different cap ratings Fostex recommend and I can't work out why they've recommended them as it makes the crossover point very high indeed....although i know it's a super-tweeter, it doesn't make sense to me given a) the lower end frequency capability of the T90a super-tweeter (5khz) and b) the range of human hearing (especially my 40 year old ears). Can anyone help me understand? Images attached to support my confusion (apologies.... I'm still new to all this! )...
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Sorry mate, I don't know what you mean, I'm still new to this. I will have the fostex R80b attenuator too, what would I need to do to make this setup a 12db/oct filter?
Thanks - Wayne.
You will want to turn on/try capacitor <1uF (0.47uF say).
Read posts from # 44 to # 49 in this thread:
Belden DIY audio cables
Read posts from # 44 to # 49 in this thread:
Belden DIY audio cables
Sorry, I still don't know what you mean, but aren't you suggesting something different to what Fostex are recommending (my first attached image)? They are showing no coils or caps for the full range driver, and an attenuator and capacitor for the super tweeter...
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Thank you, but wouldn't that capacitor make the crossover point 42khz?! See attached...
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My recommendation for supertweeter is, forget the crossover calculator and trust your ears.
I spent a lot of time doing experimentation.
I spent a lot of time doing experimentation.
Just try it and take the super tweeter in and out of circuit. There is a bit of a religion among fullrange addicts, one where they desire a supertweeter but cross it over above audibility. The low 6dB rolloff assures that some of the tweeter output will be audible.
A second order crossover would be recommended if you were trying to make a two way or cross over below 6kHz or so. Try using the recommended caps first.
Ref post 11 ....... No he is putting a notch filter in series with the 208 but he is using a 0.68uF cap in series with the tweeter and 10ohm across the tweeter terminals .
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The problem is, that the datasheet of the horn tweeter does not show the resonance frequency.
I would not use the attenuator, but an voltage divider.
I would not use the attenuator, but an voltage divider.
I don't mean this to sound rude, but why are all of your suggestions against the manufacturers recommendations? I acknowledge that you clearly know a lot about all this, but to my novice mind, it's almost as if you're trying to find a solution to a problem which doesn't exist?
In this particular example, why not use the attenuator?
Thanks.
The crossover frequency should one octave over the own resonance of the driver.
The attenuator should not be used, because the non linearity causes the crossover not to function correctly.
The attenuator should not be used, because the non linearity causes the crossover not to function correctly.
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