Terminal plates are from Quickpanel.sk, local company. They have nice application where you draw and specify the panel, and submit the order too.
It is one of my custom WGs, originally made for Scan Speak tweeters, and luckily T34B is perfect fit as well, and it measures great.
I had the opportunity to test "Pida" waveguide with my Bliesma T34B and in short I find it very impressive. The combo of a proper OSWG perfectly fit to the already remarkable driver from Bliesma is, imo, a winner.
Of course it comes at a price but I think it is well worth it. On pictures below, if you omit the artifacts from my very quick and dirty setup at about 1.5kHz and 2.5kHz I was able to get in a manner of minutes quite a nice result (LR4 1.5kHz cutoff freq). Notice the very low distortion as well.
Well done Petr !
Jean Claude
Of course it comes at a price but I think it is well worth it. On pictures below, if you omit the artifacts from my very quick and dirty setup at about 1.5kHz and 2.5kHz I was able to get in a manner of minutes quite a nice result (LR4 1.5kHz cutoff freq). Notice the very low distortion as well.
Well done Petr !
Jean Claude
Attachments
The dispersion looks awesome!
Is your system calibrated to get the correct SPL level? I am asking because your curves show rather low SPL (81 dB or so).
Yes fully calibrated at 94 dB.
I use this relatively level for two reasons:
- very bad support gear (cardboard)
- bad 3Dprint with low infill
The results were so good to me that I have ordered a pair of better quality at i.materialize and I will build a better test gear to further investigate
I use this relatively level for two reasons:
- very bad support gear (cardboard)
- bad 3Dprint with low infill
The results were so good to me that I have ordered a pair of better quality at i.materialize and I will build a better test gear to further investigate
Did you guys look into this with the t34a instead of the be tweeter? I have a pair of the al domes here waiting for a waveguide 🙂
I was considering Alu version at the beginning of this project, but there were two reasons I chose berylium:
1. Be has shallower dome profile, I somehow see this better for performance in WG
2. better sound of Be version. Hificompass described A, B and D sound differences for T25 tweeter nicely and I agree with that.
1. Be has shallower dome profile, I somehow see this better for performance in WG
2. better sound of Be version. Hificompass described A, B and D sound differences for T25 tweeter nicely and I agree with that.
Nice project. I'm watching it closely. Bliesma is on my short list.
could you please give me some details about the measurement turntable you are using? Is there any thread or something about it?
As I don't want to hijack Pida's thread to much, here is the link for the measurement table
Polar measurements with automatic turntable
Be aware that the original motor used in this project is not available any more and the one suggested for replacement doesn't work very well with the original hardware interface that you can still buy. In fact interface has problem to read the properly the Polulu encoder ! No solution provided yet.