Ring radiator tweeters - the future?

Gmood1...Why do tweeters exist? Because drivers with large cones, necessary for LF reproduction, are lousy for HF. "Lousy" means irregular frequency response within the pass band (peaks and dips) and premature roll off, sometimes covered up by a kluge called a whizzer cone, which generates lots of HF sound not necessarily related to the music. (But the ear is fooled). This can be worse than any effect of a crossover. A tweeter, having no requirement for LF response can quite easily be optimized for HF. With proper crossover design, and a tweek or two, use of a tweeter is the best solution for full range sound.

If you are happy with response to 10 KHz or so, then you don't need a tweeter.

Eldartford, Unless you've heard a recent wide range driver. There's no way for me to make you understand that you can't hear the HF noise if it exists. Actually I've tested the response of this driver with a digital SPL meter(maybe not the best tool but it gives you an idea). I still had output at 20Khz. I couldn't hear past 16 or 17khz. The meter was still measuring past my hearing threshold.

If you've spent anytime with a good single driver you might change your mind on the theories. I love the Magenepans for what they do..not knocking them. They just don't have the resolution of a good single driver...sorry. After spending many hrs with a SD you can easily hear how some crossovers veil the sound and screw up the timing if not designed properly.

The driver in my speaker is outputting only the midrange and highs from the cone. The cabinet is what produces the bass.The cabinet doesn't have much effect on the drivers above 200 or 300Hz. You need to read up on Martin King and Bob Brines worksheets. These aren't your average single drivers ..not by a mile. Does this driver look like it rolls off at 10khz? Fostex F200A FR chart. No speaker is perfect. I give up high spls above 100 dB . Not a problem since I never listen at these levels any way.

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Gmood1...I assume the the Fostex F200 is what you use. Good choice. No whizzer.

But look at the almost 10dB hump between 4 and 5 KHz. And how about off axis? And you can't really tell about the HF (15 to 20KHz) from a SPL measurement. Sure it puts out loud noises at those frequencies but is it part of the music, or just a rattle? The ear (at least when you are young) senses that there is HF sound present, and "hears" what harmonics ought to be there. The ear is fooled in a way similar to the eyes that sometimes see what you expect (a dog perhaps) instead of what is really there (a tree stump).

Of course if it sounds good to you it is good. Maybe your ears have a notch at 5000 Hz.

The FR driver in a folded horn enclosure was commonplace when I began this hobby in the mid fiftys. I had a really nice wharfedale 8" driver in one at the time. But I never liked horn resonance as a way to boost weak bass. Or vented boxes either. Or boxes of any kind.

So after telling you all the things I find wrong with FR drivers it may surprise you that I am seriously considering some experimental work with one. My idea is to exploit the extended range capability by using a FR to cover the range from 100 Hz to 8KHz or so, with a SW below and a tweeter above. This keeps the crossovers out of the critical range. Of course it will be open baffle, and I may employ multiple drivers in a line array. Most normal woofers start to deteriorate around 2KHz, with a crossover required around 2500Hz.
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Eldartford,
This is why there's a BSC and zobel used in this speaker.
It does away with the 10dB hump. It has a very smooth response through the 4 to 5khz area. You can tweak it just by changing a resistor depending on your room. A good internet friend uses tractrix line design. He claims it's the closes to not having a box as he has heard. I've never heard a tractix speaker but it sounds interesting.

I can assure you that the MLTL has a very non-boxey sound. I do like the magnepans for this... the MLTL is no different. It just has a tremendous amount of oomhp. Trust me..weak bass is the last thing you'll be worried about.

After having several types of speakers. My ears aren't being fooled by this speaker...I assure you. They have the smoothest response I've heard in my home. Too bad you don't live closer..I could change your mind very easily about this type of speaker. It makes all the horn loaded speakers I've heard sound like toys.

Here's a qoute from a owner of the same speaker that lives in NYC. He's right on the money with his description.

Bemopti123
Hi Ray, thanks for the compliment of the preamp. I will attempt to describe how it sounds.

The system has a "robust" signature. I mean, hearty sound, taut, slamming bass that it has got to be heard to be believed, especially from an 8" driver. I believe that the robust signature comes from the alnico factor of the driver. If you have heard Tannoy coaxials...the Turnberry, it sounds close like it, but the FTAs are more seamless, more transparent when the source calls.

FM via the system, especially due to the Mcintosh, it sounds very organic, once again, with gobs of presence.

The FTAs do not sound midrangey, as some single fullrange drivers, if not the vast majority of them sound like.

When I put some vinyl, you can hear more of the slam and also harshness, if the vinyl recording was badly made.

Depending of the CD track, it can sound bloody awesome, or simple pedestrian. It depends of the recording.

What is most amazing about the system is the idiocyncratic mix of really expensive components with things are are plainly DIY oriented, such as the Scott Nixon sound better than it should ever be.

I have tried something interesting, an idea I got from people who have a single source system, that is I ran the Shigaraki transport, DAC into EVS Ultimate Attenuators and then, into the monoblocks. From there, it all went to 47 Labs OTA and into the FTAs.

There was a difference in signature, but it was about 90% of what I have heard with the preamp.