Pretty crazy that the different dome profile is making this much of a difference. Great findings.
The T34B with the elliptical waveguide really looks excellent ! The sensitivity is high at 104 dB and the usual 10Khz+ on axis dip is small and quite high in frequency (probably inaudible), despite the large size of the dome.
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I'm absolutely hanging out for an 8" waveguided tweeter to mate up to my mw19tx-4's here that are my favorite woofers of the bunch. Looks like the T34B is going to be the one to do it.
Not really.
Look at the mfg datasheets, tests by hificompass, audioxpress, troels gravesen etc.
Both for the T34-A/B and the T25 versions.
Look at the off axsis responses, mfg datasheets at 60 degrees @ 20 k hz or anywhere along off axis responses.
And look at the dome shapes in profile pics at the datasheets or hificompass, easily visible in T34A vs B.
On average the AL/mg dome shape causes the A versions to have a much wider dispersion.
The 34 mm A have dispersion comparable or better then many 1 inch tweeters and is only down 9db at 20k @60 deg.
The 34 B has a fairly flat diaphgram and resulting in less wide dispersion and is down 15 db at 20k @60 deg
That is 6 DB! of difference, from the mfg datasheets, and other easily available tests show the same trends.
And judging by this they will naturally require 2 different waveguide shapes for good off axis performance, because that is not a subtle difference.
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Are the models up to date on the website? Looking for the SS6600 waveguides. Just making sure before i start printing them. Thanks!
I'm always tweaking, and if I find improvement, I update the files on my website. But as of right now, there is nothing new for the SS6600
Any chance to see the T34B files on your website or are you still working on improving things ?
I was about to post them to my site, but I have a new variant to measure in the next week, so I was holding off.
Hello augerpro!
The measurements on your somasonus website has done at 2.83V/1m for the tweeter/wg combos?
The measurements on your somasonus website has done at 2.83V/1m for the tweeter/wg combos?
Okay, thanks!
Do you think you could create similar (shallow) waveguides for compression drivers as you did for the domes?
I ask because the domes on your website are all low-sensitivity/efficiency pieces. A compression driver has a much higher sensitivity and a much wider beam angle than an average dome, so in principle a more even acoustical dispersion could be achieved and there would be less constraint on matching with other drivers due to its high sensitivity.
Commercial waveguides/horns for compression drivers are usually have very high directivity and that's not always desirable, especially for domestical usage.
Do you think you could create similar (shallow) waveguides for compression drivers as you did for the domes?
I ask because the domes on your website are all low-sensitivity/efficiency pieces. A compression driver has a much higher sensitivity and a much wider beam angle than an average dome, so in principle a more even acoustical dispersion could be achieved and there would be less constraint on matching with other drivers due to its high sensitivity.
Commercial waveguides/horns for compression drivers are usually have very high directivity and that's not always desirable, especially for domestical usage.
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I would use ATH/ABEC modeling for compression drivers. It will save a lot of time - years if my progress is any indication!
When you get the T34 8" done, is it possible to post the measurements normalized to on axis? Or post up your FRs and we can do on our end
No, the T34B beryllium dome is much “flatter” than the big T34A half sphere dome, the latter which makes waveguide tweeter throat integration difficult.
Hi 🙂
Is it possible to make huge (15 inch) and shallow waveguide to this:
http://www.tb-speaker.com/products/w2-803sm
Is it possible to make huge (15 inch) and shallow waveguide to this:
http://www.tb-speaker.com/products/w2-803sm
Interested in seeing your website but haven't found a link. Is it posted in this thread? Thanks.