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Old 11th July 2002, 01:20 PM   #1
nar is offline nar
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Default I need SPECIFIC super-tweeter!...Help...

In order to complete high frequencies range for my system,I am looking for a GGGOOODDD driver,and specifications following are greatly desired:

* efficiency must be 97 dB/W/m/2.83V at least.

*frequency range:8kHz~50kHz approx.

*must have strict 40V X 90H controlled directivity

*impedance desired:8 Ohms

*must be horn-loaded,of course!!!...

So?Anyone inspired?Perhaps a 3/4" driver?

If you have seen such a monster,please let me know.I need help...I think high efficiency afficionados would know more than me on this subjects...Any comments welcome!!!

Regards

Anael
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Old 11th July 2002, 02:09 PM   #2
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Really no one can answer ?!?!
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Old 11th July 2002, 02:30 PM   #3
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Hi nar

Maybe a plasma tweeter coupled to a DIY horn would do the trick.

Regards

Charles
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Old 11th July 2002, 04:35 PM   #4
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Default Re: I need SPECIFIC super-tweeter!...Help...

Quote:
Originally posted by nar
In order to complete high frequencies range for my system,I am looking for a GGGOOODDD driver,and specifications following are greatly desired:

* efficiency must be 97 dB/W/m/2.83V at least.

*frequency range:8kHz~50kHz approx.

*must have strict 40V X 90H controlled directivity

*impedance desired:8 Ohms

*must be horn-loaded,of course!!!...

So?Anyone inspired?Perhaps a 3/4" driver?

If you have seen such a monster,please let me know.I need help...I think high efficiency afficionados would know more than me on this subjects...Any comments welcome!!!
Hi Anael,

You don't want much do you? I did a LOT of research on this subject, and there are 3 options I found, and one comes pretty close to what you're looking for, except for the 90x40 directivity (which I think is unneccessary). Oh, and it's the cheapest of the three, the <a href="http://www.fostex.co.jp/int/pages/products/spunits/unitpdf/ft17h.pdf">Fostex FT17H</a>. I spent a couple of days comparing this to the Tannoy supertweeter and few could tell them apart, and no-one consistently preferred one over the other. None of the others Fostexes go as high (not many drivers do at all!). At the frequencies you're wanting to use it, I don't think you'll be able to tell the difference in directional patterns, as humans are not very good at picking height. It has about 90 degrees conical pattern.

The other two are the <a href="http://www.pioneerelectronics.com/Pioneer/CDA/Industrial/IndustrialTADProductDetails/0,1445,868,00.html">TAD PT-R9</a> or the <a href="http://www.pioneerelectronics.com/Pioneer/CDA/Industrial/IndustrialTADProductDetails/0,1445,871,00.html">TAD ET 703</a>. Possibly the best in the world, but dig the prices.

Last is the <a href="http://www.stageaccompany.com/cdload.html">Stage Accompany SA8535</a> . And if you thought the TADs were expensive.....be sitting down. But it only does about 30kHz. Love that 108 dB efficiency though.


HTH
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Old 11th July 2002, 10:19 PM   #5
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Just curious; why 50 kilohertz? Does your pet bat want to listen to some CDs?
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Old 12th July 2002, 12:05 AM   #6
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<b>Maybe a plasma tweeter coupled to a DIY horn would do the trick.</b>

Just thought I'd buzz in. Good luck getting a plasma tweeter to meet that efficiency, even when loading a horn.

-b
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Old 12th July 2002, 01:31 AM   #7
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Quote:
Originally posted by ringtheorist
<b>Maybe a plasma tweeter coupled to a DIY horn would do the trick.</b>

Just thought I'd buzz in. Good luck getting a plasma tweeter to meet that efficiency, even when loading a horn.

-b
But think how much you'll be helping the environment by regenerating the ozone layer.

Accurately building a horn with an Fc around 6kHz would be a challenge for most people too.
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Old 12th July 2002, 10:02 AM   #8
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I am intrigued with your specification of an upper frequency reproduction capability in the ultrasonic!

Are you looking for a driver that is linear throughout the high end?

I notice how strikingly similar the SA ribbon driver is to the successful Infinity EMIT drivers of recent years. I have experience with these drivers and their construction. I studied them in detail after having an amplifier kill one by running away (HF oscillation).

The amplifier had in input board failure, and it is a hefty one, a Soundcraftsmen PM1600. (Pro Power 8 in some circles) It's the only amplifier I used that was capable of fully driving the RS II speakers (First generation, better cone midrange drivers).

I assure you, in terms of efficiency and capability, go with the ribbon drivers. Horn loading dramatically increases their efficiency, but off-axis effectiveness is completely dependent upon the horn.
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Old 12th July 2002, 03:57 PM   #9
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Cool The reason of my quest

Why getting to the 50kHz?response is,simply,I have rabbits and they love listening to music....

'kiddin' of course.I do have rabbits but they don't like the noisy things I listen to.

The analog support gives ability to get to the 50.000 Hz(I mean a good vinyle record,a good turntable,a good cartridge and impressive RIAA stage.

But with the new medium like DVD audio 24/192 and SACD,we can also pretend to go as high.On that point,CD is really dead for me.Sorry to shock some of you...it's personal point of view,and if you don't like it you are not forced to go on!!!Really...

Even if human ear is not able to hear"really" those frequencies,I think listening live to a Strad.violin you are forced to recognize that sound doesn't look like what we get either on CD or with a cutted bandwith at 22.05k.With so many phase shifts due to output filters,it can be heard since 10kHz that something is wrong compared to reality.Harmonics ranks after fundamental for a single violin note are very high and subtle.Even if we can't hear those highs like a single sound,they are so well integrated in the sound that it makes it really live compared to a conventional CD playback.

Like I already have horns with a perfect controlled directivity of 40V X 90H,which is usefull respect to clarity of sound vs.room acoustics,it is reasonable to wait for a driver which:1)can complete the highs of the 1' driver after18k 2)has exactly same directivity pattern than the horn at the frequency roll-off (round about 8k-----10k-----12k---16k !!! I don't know yet.

I have already thought about the Fostexes.But the cone and all stuff gives bad off-axis regularity of the high fall of frq.response.

So what.Perhaps will start to DIY modify a driver to join it a horn?
I think it will not be a plasma,ribbon neither.Maybe the FT17H to be dismanteled and re-design(nice DIY accurate job!!!...)the whole thing to get a splendid complement of those wonderful Guigue Horns....

Anyone interested?
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Old 15th July 2002, 10:22 PM   #10
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I like my SA8535 isodynmic ribbon. In fact, my design
will have 4 per cabinet.. Hopefully, I will be done by
year end on this speaker system. Always looking for something
better that has high sensitivity and great sound, so far
this one hasn't been challenged. I've been unsuccessful
to find a challenger. Perhaps is just my personal taste
as why I like it?
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