hope you tell more about sb26cac vs the Be... subjective reviews are always a plus
@digitalthor : you was one of the inspiration to try the SB26ADC and AugerPro at the same time ! Always loved hard cones. If no wave guide I would have chosen the Seas with titanium former though or maybe the Bielsma 25A ... One never know, but just based on the datasheet I prefered the ADC over the CAC, dunno if I'm wrong or rigth... Not a big risk though !
At a attentive Diya reader, it is hard to find any listening benchmark (but measurements) between SS, Bielsma or SB Acoustics Be dome. HifiCompass, HumbleHomemade, Troels Gravsen are semi-pro, not 100 % stupid dreamer enthusiast as I... (At the same time I'm going a try to 10" mabat'horn free domain with a 1" CD...) . Off topic, sorry!
At a attentive Diya reader, it is hard to find any listening benchmark (but measurements) between SS, Bielsma or SB Acoustics Be dome. HifiCompass, HumbleHomemade, Troels Gravsen are semi-pro, not 100 % stupid dreamer enthusiast as I... (At the same time I'm going a try to 10" mabat'horn free domain with a 1" CD...) . Off topic, sorry!
Augerpro's work is very persuasive and thorough - besides - I couldn't really find any other cheap driver that has this level of performance all over. Most other more expensive drivers, all have a bit more - something - that I don't know what is. And even though I heard the T25B in a waveguide - and it sounded great. I can't really say whether it is worth the extra 6-8 times the price of the ADC - or not.
I remember Ulrik telling me, that the ADC was a little gem of a driver, some time ago. And I can attest to that in my now everyday use of that driver, from listening to music, seeing movies and talks/presentations.
I'm happy that I inspired others to waveguides - because I truly believe that it's a pretty solid way to make a great sounding loudspeaker. But I'm merely standing on the shoulders of great work by others 😊
Oh yeah.... I looked at the CAC too..... because something about a white dome, that gives me ideas when fiddling with design looks. But now I consider printing white WG's, to compliment the deep black shiny alu dome.
Lol, JLPCB company is unable to convert the inches sized .stl in centimeters... That should be the chineese new years day effect ?!
I can make you a metric one if you can't do it yourself, just point me to the one you want.
Weird. It took me 5 min to simply find a company where you just upload the file and push either mm or inch, then review the file in 3D before sending a quote for printing in 5 different materials.
Thanks Fluid, much appreciated.
Don't want to bother you and take your time for that, you already help people a lot here.
I find a suitable local company over JLPCB, as I think 3D printing will be more and more current. If one is knowing a not expensive one in Europe please ?
Don't want to bother you and take your time for that, you already help people a lot here.
I find a suitable local company over JLPCB, as I think 3D printing will be more and more current. If one is knowing a not expensive one in Europe please ?
10 x the price of a Visaton WG at i.materialise with simple SLS... Ils sont fous ces belges !
It takes no time at all to do. I have done it and attached a metric version for the round 6.5, for SB26. It took longer to write this post than convert the file 🙂
JLPCB are quite cheap and if you stick to SLS or the more standard FDM filaments you should get something for a reasonable price. The problem with the ST260 was the choice of resin. Resin prints are very difficult to stop from warping when they get big. SLS and FDM don't have such a problem. I imagine Brandon's waveguide's would print fine in resin if that is what you want.
I just checked prices for the 6" waveguides I printed a couple months ago, and they jumped from $68 to $89. Prices move a lot, if you can wait just keep checking in on prices. The waveguide you were looking at was $152 in MJF, which is a bit cheaper than SLS at the moment.
yup more than 320 euros a pair.... that's ridiculous (or not) if I compare with a Visaton or Monacor WG (ok it is apples/oranges comparaison). But that is 20 x more than JLPCB (stupid them to not having inches to cm conversion on line as i.materialize !).
Hummm, already gave up mabat's ST 260 cause too thin thickness for them to be shipped as a standalone piece from China according JLPCB, think I am to give up WG for sb26ADC too due to the european third party printers prices !
At this price, a Be pair sb25 from Bielsma non horned is more tempting, even if crazy money for my average wallet ! (or at least fluid 34A horned if better for the ears !). I am even not sure a Bielsma Be 25 mm is better than a SB26ADC horned in an average european living room, uh !
Ok, totally off topic, here, sorry for that.
Hummm, already gave up mabat's ST 260 cause too thin thickness for them to be shipped as a standalone piece from China according JLPCB, think I am to give up WG for sb26ADC too due to the european third party printers prices !
At this price, a Be pair sb25 from Bielsma non horned is more tempting, even if crazy money for my average wallet ! (or at least fluid 34A horned if better for the ears !). I am even not sure a Bielsma Be 25 mm is better than a SB26ADC horned in an average european living room, uh !
Ok, totally off topic, here, sorry for that.
You're welcome, these posts from TNT and those surrounding them show what he got from JLCPCB, maybe you can try those options as they did manufacture and ship them.
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6990137
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6989898
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6990137
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6989898
I had thought that the lowest frequency that a waveguide loads a driver down to was determined by (speed of sound / depth / 4). ie, if a waveguide was 3" deep, it would load the driver down to 1125Hz.
But Brandon's comment, and comparing the frequency response curves of Wavecor's TW030WA11/12 tweeters (with waveguide) against the curves for the TW030WA05 (sans waveguide), suggest otherwise 🤔.
Thank you, Brandon.
It is more complicated than that. To your previous question width and depth together determine nominal coverage angle, once you have decided on a coverage angle, the depth is determined by the width or vice versa. The greatest gain is had by reducing the solid coverage angle, the narrower the radiation the greater the output. A 60 degree device will be louder than a 90 degree one, all else being equal. The radiation impedance seen, changes significantly based on the curvature of the device. An exponential throat will behave quite differently to an OS or conical. None of them follow the handy little rule of thumb very closely. For example in one of Brandon's waveguides I simulated that was 20mm deep the boost from the waveguide starts to give out at just below 3K. This coincides very closely with where the real and imaginary parts of the radiation impedance cross each other. Some other guides suggest that cutoff in an OS is at about 0.2 for the real part in a normalized impedance plot. That is at about 2K in the graph attached below and is where the curves converge together and the waveguide is doing nothing.
Attachments
Loading of a waveguide is not a determinant of how low you can use it, generally speaking. For that matter it isn't of significant importance in a direct sense, as is often noted when using a compression driver.
Eg a more conventional contstant directivity waveguide is generally useful to below where it loads, and it doesn't really cutoff per se, nor is it important where it transitions.
Eg a more conventional contstant directivity waveguide is generally useful to below where it loads, and it doesn't really cutoff per se, nor is it important where it transitions.
@diyiggy - I just got an offer on the 5" WG's. The most expensive they could make, was 75 Euro a piece, but maybe only 30 Euro. Try and ask them if they can help you as well.
You simply upload the file and chose whether it's in inches or mm. if the model is 18 x 18 x 18 cm and less than 75 gr. Then they print for 10 Euro - fixed.
https://www.3dprintaarhus.dk/vare/3d-print-maks-18x18x18-cm/
I might have a pair made by them very soon, and I can post in here how it went 👍
You simply upload the file and chose whether it's in inches or mm. if the model is 18 x 18 x 18 cm and less than 75 gr. Then they print for 10 Euro - fixed.
https://www.3dprintaarhus.dk/vare/3d-print-maks-18x18x18-cm/
I might have a pair made by them very soon, and I can post in here how it went 👍