Visaton WG148R Waveguide: Highest SPL tweeter with flat faceplate?

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#24
YSDR said:
This: https://www.dibirama.altervista.org...3-audax-tw025a2-tweeter-1-4-ohm-110-wmax.html

Or this: https://www.dibirama.altervista.org...-audax-tw025a26-tweeter-1-8-ohm-200-wmax.html

Or maybe this: https://www.dibirama.altervista.org...9-seas-27tffc-tweeter-1-6-ohm-200-wmax-2.html this is the TFF version, not the TFFC.
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I found experimentally that the audax 25mm dome is too small diameter to match the opening of the Visaton waveguide. It has a cancellation around 12Khz. I'd say it was a great suggestion until I tried it. I found that an SB Acoustics Satori T29R gives good response, requires a 50mm o-ring to make a seal with the horn opening which is easy to implement.
 
#26
How about the Audax TW034, which can be adapted to the WG148 with a smaller flange? The TW034 will do 94dB/2.83V on its own and even more with a stacked extra magnet. It sounds great too.

The Seas T35C002 also does 95dB/2.83V and can be crossed around 2k with ease, handling alot of power. Distortion is very low. You can push it very hard and adapt it the WG148 for even higher output levels.

The Audax TW025A28 is a potent 25mm dome that can play very loud. Its around 93 - 94 dB/2.83V without WG and adapts easily to a WG thanks to its flat faceplate.
 
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#27
Hiperia said:
Hi,

I am interested, can you give mores informations about the usage of this horn on the T29R and photos please ?


Thanks
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First I apologize these measurements are sloppy. They were not done in ideal conditions = no baffle, microphone fairly close to horn because at further distances there's diffraction.

The TW29R faceplate is not flat, it has a very slightly conical profile which means it doesn't make contact with the waveguide in the center where the dome is, it only contacts at the outer edges. So I had to find a way to seal it.

The curves below are with the SB Acoustics TW29R Satori mounted on a Visaton WG148R waveguide, using modeling clay to make the seal between the tweeter and the waveguide:

SB29R + Visaton WG148R with modeling clay.png

I have attempted to also give you ~45 degrees off axis response but I can't be sure the distance to the microphone was consistent.

This is the same thing but with a 3.5mm thick x 50mm inside diameter rubber o-ring, instead of modeling clay:

sb acoustics satori t29r + visaton WG148R + 50mm o-ring.png

Same disclaimers apply. The 45 degrees off axis is sloppy and I'm not at all confident about the overlap of those curves, only the general shape of the curves.

The o-rings were the largest in this assortment from an Amazon o-ring kit pictured here; link https://amzn.to/3s3xQuT

sb-waveguide_o-rings.jpeg


Here are photos of the tweeter with o-ring seal, front and back:

sb-waveguide_front.jpeg
sb-waveguide_back.jpeg
 
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#28
@profiguy Very interesting you should mention the TW034, because that's where my quest originally started. I built this system https://www.diyaudio.com/community/threads/open-baffle-bass-reflex-hybrid.393837/ with Audax TW034X0 34mm classic soft domes matched to Troels Graveson waveguides. (http://www.troelsgravesen.dk). They have high efficiency like you say.

The TW034 tweeters sound very good. They are laid back, they have a soft, very non-fatiguing character which is great for some people. But to my ears they're a little midrangey and not edgy enough. So I started this thread because I wanted 1) to use the less expensive, easier to obtain Visaton waveguides, and 2) have a more detailed, more aggressive tweeter that could still keep up with a high efficiency woofer.

Your suggestion of the Audax gold dome is quite interesting, I'm sure that would be a very efficient and detailed sounding tweeter.
 
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#34
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#35
Harry72 said:
Have you looked at the large dia Wavecore tweeters, the TWO30WA11or12 almost fit your wants except for maybe the ultra high spl and no need for the WG as they already have one
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These are clearly very good tweeters and can work here, but the Wavecor waveguides are optimized for flat on-axis response instead of Constant Directivity. Their off axis response tilts downward faster than I would like, and for this application I need a waveguide that's at least 6" in diameter. The Wavecores are 4.5" in diameter, which means they don't have any directivity at all below 2K. That means the radiation pattern won't match the woofer around 1500-2000Hz.

The family of curves just linked by @mbrennwa is what I'm looking for. The comparison between those and the Wavecore is instructive.
 
#36
mbrennwa said:
As noted above, the ScanSpeak R2904/7000 will do what you need in the WG148.
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@mbrennwa

Do you have any high SPL measurements of this tweeter?

Looks like it will achieve 113dB in the top two octaves (5-20KHz), at least according to the datasheet.

In the waveguides suggested, do you know if it can reach 115dB, as per OP requirements?

I have a (mainly academic) curiosity in this tweeter, as my system is limited by the R2604/8330 dome tweeter, as it maxes out at 110dB@1m- dynamics compression effects creeps in:

https://www.diyaudio.com/community/threads/high-dynamic-range-104mm-dome-tweeter.386061/post-7020212
 
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