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Multi-Way Conventional loudspeakers with crossovers

Fostex FT17H - hurts my ears
Fostex FT17H - hurts my ears
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Old 8th October 2014, 10:28 PM   #21
Rewind is offline Rewind  Sweden
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Fostex FT17H - hurts my ears
Trying the FT17H now with a total of 10 uf Mundorf caps (3 in parallell). Much better than just one in parallell. I made an L-pad with R1=3 ohm and R2 = 13.7 ohm, which should lower it with -4dB. Still a bit louder than the Greencone. I think why it sounds screechy with a 3 uF cap is that a) it is louder than most other drivers, even with L-pad of -4dB. Will try another L-pad tomorrow (i.e. burn more pencils). b) It is a good driver that can go far below 10kHz. Why not follow its own slope. It starts going down after 2kHz. I am sitting right next to it now and it sounds very smooth. A little plastic sounding, compared to metal, but without the ringing.

The sounds is more present and with a Live feeling, more so than with the Beyma TPL-150 which is more polite. I am playing with any other horns and at low to moderate listening levels with a Camp Amp class A 6W.

Last edited by Rewind; 8th October 2014 at 10:34 PM.
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Old 9th October 2014, 01:07 AM   #22
dumptruck is offline dumptruck  United States
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A 12" crossed to a small-horn super tweeter? Does nobody think the power response may have more than a little to do with this problem? Here's my sloppy guesstimation of the response at 45, scribbled in black on top of the woofer spec sheet:
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Last edited by dumptruck; 9th October 2014 at 01:11 AM.
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Old 9th October 2014, 02:06 AM   #23
Godzilla is offline Godzilla  United States
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>>> It sounds to me like the supertweeter is crossed to low. Using a 1.0 or possibly a 1.5uF high pass capacitor is more typical...

I love the Beta 12lta and the Fostex super tweeter but they are not a good match IMO. The 12lta sounds best with a pro tweeter in a small horn. I use the $30 Eminence. The Fostex tweeter is too sweet sounding and yes, it needs to be crossed much higher with a 1.5uf cap as a maximum value. I think I had .68uf on them with the 12lta but ultimately swapped them for the pro tweets. The 12lta sounds best to me without the dustcap and with a phase plug. Otherwise, it has a honky sound that's not appealing during critical listening. It's always fun tho because it has a big dynamic sound - not like a 3 or 4 inch full range driver that many of us also enjoy.
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Old 9th October 2014, 07:01 PM   #24
Rewind is offline Rewind  Sweden
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Fostex FT17H - hurts my ears
Listening to it now. As long as the music is not too complex the open baffle Greencone and FT17H produce very very clean sounds when highpassed as low as 2000Hz with a 10uf cap, and L-pad. Of course without much bass. However, I doubt I will ever enjoy open baffle midbass. And using open baffle mixed with sealed or vented midbass boxes would not fit. Bummer. Very fun experiment.
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Old 13th September 2015, 11:23 PM   #25
pur40422 is offline pur40422  United States
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"Maybe the 6db cuttof isn't sharp enough and the driver has brake up problems?"

I am using the FT17H in a 3 way high efficiency system crossed over at 6kHz and 3rd order Butterworth.

I had tried 1st and second order crossovers at above 6k, but was never very pleased with the sound.

I have not done any measurements but I like the tweeter's sound much better with 3rd order.
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Old 23rd February 2019, 01:35 AM   #26
audiomovil is offline audiomovil
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Hello!
Do you have the diagram and values parts for the xover?
I just bought a pair of FT17H for my FF225WK.
Thanks in advance.


Quote:
Originally Posted by pur40422 View Post
"Maybe the 6db cuttof isn't sharp enough and the driver has brake up problems?"

I am using the FT17H in a 3 way high efficiency system crossed over at 6kHz and 3rd order Butterworth.

I had tried 1st and second order crossovers at above 6k, but was never very pleased with the sound.

I have not done any measurements but I like the tweeter's sound much better with 3rd order.
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Old 23rd February 2019, 05:47 AM   #27
Rewind is offline Rewind  Sweden
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Fostex FT17H - hurts my ears
I would just return them and get better tweeters. :S Not worth spending too much time on. The problem is that plastic memrane.
The smoothest tweeters I have heard are ribbon tweeters, Raal being the best, but too expensive maybe. If you want an expressive tweeter, but with slightly more distorton, you can look at other bullet horn tweeters from Fostex or others. Less smooth but more expressive. Then you have regular dome tweeters which is allround, not being too great or too bad at anything. I try to stay clear of them.
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Old 23rd February 2019, 03:47 PM   #28
audiomovil is offline audiomovil
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Quote:
Originally Posted by Rewind View Post
I would just return them and get better tweeters. :S Not worth spending too much time on. The problem is that plastic memrane.
The smoothest tweeters I have heard are ribbon tweeters, Raal being the best, but too expensive maybe. If you want an expressive tweeter, but with slightly more distorton, you can look at other bullet horn tweeters from Fostex or others. Less smooth but more expressive. Then you have regular dome tweeters which is allround, not being too great or too bad at anything. I try to stay clear of them.
Thank You Rewind, those Raal looks great, sadly out of my budget, I'm looking for something under $75 usd each, any other suggestions?
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Old 23rd February 2019, 08:39 PM   #29
Rewind is offline Rewind  Sweden
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Fostex FT17H - hurts my ears
It is a gamble but I would go for these, as long as your current driver can do midrange. Fountek NeoCd3.5H Horn Tweeter
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Old 23rd February 2019, 11:13 PM   #30
adason is offline adason  United States
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That is an excellent inexpensive ribbon. Great suggestion. I have used it two builds.
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