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Adding Tweeter to Full Range
Adding Tweeter to Full Range
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Old 24th June 2007, 06:53 AM   #81
Geoff H is offline Geoff H  Australia
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"On that sense you would be allowing for more resolution to be assimilated (now that last bit just came out of my head, is speculation on my part, and might be a crock -- bt at 2:30 in the morning, it seems like it might be a workable hypothesis)"

That makes sense, even if conjured up in the wee small hours. The sense of direction comes from the phase difference between the ears. Spreading the beam should reduce cone introduced phase changes.

I finally got around to trying out some KSN1038s. The idea of running these without a crossover is nothing but a marketing ploy. Unmodified, I would not use them crossed over at less than 10K. Their efficiency is not that great either, above 10K anyhow.

In my application, I wanted 103dB/w/m. Recalling Fredi's suggestion in another post, I stepped up the voltage with the aid of an auto transformer. Still about 8 dB short. However it did flatten out the FR, a combination of electronic/acoustic x-over.
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Old 24th June 2007, 07:05 AM   #82
Geoff H is offline Geoff H  Australia
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The resultant f/r.

The best I have heard these is with the shunt 33ohm res, and a series 0.47uf poly cap. That will provide about 91 dB/w above 10Khz.

Try and use them x-o ed at 5K and they sound like a disco. The top end is worth exploiting, if you have some laying about. But I think my solution is with new whizzer cones.

Geoff.
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Old 20th September 2011, 03:52 AM   #83
hasaudio.co.nz is offline hasaudio.co.nz  New Zealand
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What are your opinions on using a tweeter with the f8 exotic fullranger from seas? Thinking about the exotic t35 to give the rullranger a hand up top. Or perhaps the r2904 revelator...
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Old 20th September 2011, 10:51 AM   #84
norman bates is offline norman bates  United States
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I wouldn't run a piezo without a resistor in series and using an active crossover.

Otherwise, just too spitty.

Another valid way is the transformer way (freddyi has). Search at audioasylum.com, look under high efficiency asylum. Look for piezo with the author djk.

Norman
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Old 20th September 2011, 11:11 PM   #85
norman bates is offline norman bates  United States
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If I remember, some piezos look to be 60ohm load at 20khz (like the 1038a, medium piezos with a peak/resonance around 4.5khz). Using a 25v line transformer (can't remember which watt tap), you hook it up in reverse. The 25v transformer is like the 70v line transformers used to hook up multiple speakers from a single amplifier such as a bunch of little speakers around a hospital.

You put the 8ohm load on the amp side and the other side (around 120ohms) to the piezo side. You have a 60ohm resistor is series on the piezo side. After doing that, now you can address the amp side of the transformer ideally with a zobel (for the tranny), and I think you could then add a notch (amp side).

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Old 21st September 2011, 01:56 AM   #86
planet10 is offline planet10  Canada
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Adding Tweeter to Full Range
Quote:
Originally Posted by norman bates View Post
I wouldn't run a piezo without a resistor in series and using an active crossover.
Piezo Tweeter Crossovers | J Risch

dave
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Old 21st September 2011, 07:46 AM   #87
norman bates is offline norman bates  United States
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"Piezo's crossed over in this manner don't sound as harsh and spity"

yuck. I prefer not harsh at all, and definitely not spitty.

There is a 4 page pdf from either cts or motorola that explains it. I'll dig for it later. Oh yea, you can also use an l-pad (easier load for an amplifier instead of oscilating).

Norman
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Old 21st September 2011, 10:45 AM   #88
norman bates is offline norman bates  United States
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I can't find it, it was a 4 page thing explaining it (from motorola or cts)

here's something from freddyi using the 1016a with transformer

Click the image to open in full size.

here's spec sheet of a 1016a
http://www.martinsoundpro.com/upload/item/ksn1016.pdf

But yes, you can run them wide open or with resistor/cap, but I wouldn't.
Sorry to step on some toes here. Done right, golden ears are stunned at better than ribbon detail. Now they are harder to find (not the goldwood junk), quite pricy compared to 7 years ago, and the transformer circuitry is tricky, not much of an option for those of us doing full range thing.

Norman

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Old 22nd October 2011, 07:49 AM   #89
andyjevans is offline andyjevans  United Kingdom
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I have Alpair 10 units - very smooth and nice but a little shy in the treble. So wanting to add a ribbon supertweeter with a simple capacitor rather than using a 2-way crossover. Alpair 10 are about 88db so one question is matching. I've been looking at Fountek Neo CD1, 3 and 3.5H and Aurum Cantus G2si. The cheapest of these is the Neo CD1, but I'm wondering if this would match the Alpair since the sensitivity is 90db - pretty identical but leaves nothing in reserve. The others are 90-something.

I'm sure adding a ribbon is nothing new, so hopefully others can report on good solutions (the JX92 would be a similar case). Can anyone give me some help and guidance or experiences of such ribbons, or indeed suggest any other tweeter type? There's virtually nothing online on the Neo CD1, but more on the other models. Specifications show the CD1, CD3, CD3.5 and G2si left to right.
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File Type: png Fountek CD1.png (100.4 KB, 126 views)
File Type: png Fountek NEO CD3.png (91.9 KB, 118 views)
File Type: png Fountek NEO CD3.5H.png (77.6 KB, 17 views)
File Type: png AurumCantusG2si.png (151.7 KB, 29 views)

Last edited by andyjevans; 22nd October 2011 at 07:53 AM.
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Old 22nd October 2011, 08:09 AM   #90
zygibajt is offline zygibajt  Poland
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Halo,

I'm using G2si on top of Fostex FE204 (older brother of FE206). Crossed with 2uF Siemens MKV cap and L-padded with Mills resistors. All I can say the top end from this units are really of high quality.

I'm planning to change my speakers for something new, with bass augumantation and most probably better full range driver, most probably whizzerless as I'm little tired of whizzer's sound and probably the only thing that will stay for some time will be G2si drivers, they are really nice and worth the money.

I'm yet to try Fostex T90A or T925A, but the cheaper Fostex were not the match for the G2si
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