I'm thinking about releasing the code as an open source (C++ classes) - I'd love to see it implemented with a proper GUI and a real-time visualization of the waveguide being designed. Initially I thought that I will be able to write it myself but now I see I'm really not as it takes much more time than I'm actually willing to give it (now, after I have finally found my waveguide!). Would there be any volunteers to make this happen?
Last edited:
Sure, I wouldn't care about the technology used. I already tought of what you mention but for me it would mean to learn these things from scratch. I'm not a web guy, I used to code real-time systems for Air Traffic Control, civil and military (and still do from time to time) - not much scope for pretty pictures and all the sauce 
Last edited:
mabat: there is a nice STL viewer written in C++ and Qt5 which could be extended by your code
- GitHub - mkeeter/fstl: The fastest STL file viewer
- GitHub - mkeeter/fstl: The fastest STL file viewer
BTW I have found a wonderful library for a mathematical expression parser and evaluation engine: C++ Mathematical Expression Library
With the use of this library, any parameter of the waveguide profile could be easily specified (on the user level as a plain text) as any imaginable function of some other variable, like the angle around the horn or whatever. Just imagine the possibilites!
With the use of this library, any parameter of the waveguide profile could be easily specified (on the user level as a plain text) as any imaginable function of some other variable, like the angle around the horn or whatever. Just imagine the possibilites!
Last edited:
I'm very interested doing a web version, but unfortunately cannot do it in near future, too much burden already amidst house renovation, work, kids at home school etc. weird family routines in these weird times I'm sure someone will do something with it, since your work is gonna shake (already doing it) the DIY horn field, and why not commercial actors wouldn't use something like this as well. Many thanks for your work!
I'm sure someone will do something with it, since your work is gonna shake (already doing it) the DIY horn field, and why not commercial actors wouldn't use something like this as well. Many thanks for your work!
So I'm not really sure what exactly you're going for here, but it would be quite fortuitous to end up with a result that allows for a conventional dome tweeter in a good waveguide with a narrowed throat (compression) for controlled/constant directivity all the way to 20 kHz or above.
As for the foam plug, it should be noted that the subjective benefit is still not supported by any data.
That is not true. Several decades ago I did measurements with and without foam. I was able to show that the ringing after the impulse response was significantly reduced. It was a long time ago and I'll see if I can find that data and post it here.
I agree to that. I just want to see how far I can get. I don't know what you mean by a conventional dome tweeter - I would use a regular compression driver, only from the convex side of the diaphragm.
Here is the "data" showing the objective effect of the foam. The damping of the impulse ringing can clearly be seen. Although appearing small in the impulse, in dB terms it is quite significant.
There is very little in audio that has shown "an audible difference in a controlled blind test." So if that is the criteria for discussing something then there will be a very short conversation
There is very little in audio that has shown "an audible difference in a controlled blind test." So if that is the criteria for discussing something then there will be a very short conversation
Attachments
I did a lot of work with auralization, it's not so easy.
Back in the 80's we did auralizations of in-vehicle audio systems to do subjective tests. These were OK, better than nothing, but still lacking in many ways. Huge differences were notable, but small ones could get lost in the errors.
Later in the mid-2000s I got a HEad binaural system and recorded many of my speakers and others in my sound room. On playback they were not really even close to the real thing. I think that is because I just used regular headphones and not the Head EQ'd electrostatic ones that we used at Ford. But those headphones were beyond my budget so none of this worked out for me.
Floyd once told me that they had a lot of success at JBL with auralization, but I never learned their techniques. Having an orders of magnitude greater budget, I am sure that they could get this to work. But a practical DIY system would be extremely hard to pull off.