Even more precedent than that... I 'stole' the idea from an old ~1970 pair of Wharfedales I had. 2 ways with a crossover near 1kHz were common in the 60's AFAIK. The original AR-1 used an Altec 755 as a 'tweeter'.
This is really the kind of project where you'd want to try a few different crossover points and decide for yourself. Dave reports plenty of dynamic range with a 350hz crossover, and I do like crossing at the baffle step if possible. OTOH, years ago I crossed an FF125K to a 10" bass driver at about that zone, and it clearly could not keep up with the woofer, at least with a 1st order highpass. Obviously a steeper and/or active crossover will solve that, but introduces its own problems.
If it has the minimal treatment SDX7 rolls off fairly smoothly at 1.4-1.5 kHz. If stock it is a rollercoaster above 500 Hz.
dave
FF225wk.
I know it ain't cheap, but what about adding a fostex supertweet ?
Like the ft96h ?
http://www.fostexinternational.com/docs/speaker_components/pdf/ft96hrev.pdf
Not sure but a 2uF should be a pole near 10khz.
They recommend 1uF (20khz pole, -3db@20khz, -9db@10khz). This seems too high for me.
Norman
I know it ain't cheap, but what about adding a fostex supertweet ?
Like the ft96h ?
http://www.fostexinternational.com/docs/speaker_components/pdf/ft96hrev.pdf
Not sure but a 2uF should be a pole near 10khz.
They recommend 1uF (20khz pole, -3db@20khz, -9db@10khz). This seems too high for me.
Norman
Steve the shawdow (the guy that came up with Metronome) has just done up (with Toppy's help) an FF225wk Met + FT17. He found a 1 uF worked right afetr trying a whack of variations.
Last post in the thread (as of now)
audio-talk :: View topic - Axiom 401 in a Metronome Cabinet
A more efficient tweeter would need a smaller cap.
dave
Last post in the thread (as of now)
audio-talk :: View topic - Axiom 401 in a Metronome Cabinet
A more efficient tweeter would need a smaller cap.
dave
if the extreme extension and sensitivity of this class of horn super tweeter is not essential, something like the 85WK allows a lot more flexibility in terms of playing with XO corner and slopes, for slightly more than 1/4 the cost of the FT96H
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.