Yes, indeed. A funny thing is that the output wave is still virtually spherical: https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-7419319
Yeah the taped one is simply to have a reference when the air pressure can’t escape freely through the resistance of the holes.
The images didn’t show in the right order so I made a gif to show the result more clearly
Attachments
You cut off the DC flow, but not the sound transmission through the membrane.
Do you listen on-axis?Hi, yeah sorry I noticed too late that the text was not accurate enough. I got your remark regarding about same thing earlier already, thanks straightening it up again.
What I ment is perception of mine, sound coming from speakers direction is just different listening further away. I have simplified sound that localizes to direction where the speakers are, frontal sound, as direct sound. Being a hobbyist I'm not too familiar with exact meaning of words, mistake there. Now being corrected few times it should stick.
Further away I cannot perceive direct sound and room sound separately with my setup, they seem to be merged into one roomy sound coming from direction of speakers. There doesn't seem to be distinct room or direct sound, it's just one hazy blob of sound localizing somewhere direction of the speakers. Listening close enough sound seems to clear up, for some reason, localizes much more accurately and timbre changes some. Moving between the two distances, it appears as if influence of local room disappears when close enough.
Comparing the two listening distances perceptually, frontal sound appears to be either very roomy or opposite, rather direct. So, it's just uneducated trying to describe what's hard to describe
What's the distance between the speakers and the opposite wall?
Hi, sometimes, I haven't found favourite yet, listening happens within listening window of about +-30deg and I've been experimenting with positioning and toe-in. Speakers are at front wall, listening spot kinda middle of room, so back wall behind listening spot is quite far away, 3m or more depending on if speakers are on the long wall or on both walls in a corner setup, where corner, the speakers and listening spot make roughly a square.
You're right, the formation of a hexagonal pattern off-axis is more apparent when in farer away (3 dB step).
@mabat Can you share a picture of the backside? Also - are these hollow shells, which are then injected with some liquid material?
It's assembled using these parts: https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-7407617
It's a prototype, still only a regular 3D print using infill. I wanted to see how it works out. Today I want to add a mounting flange and finally test it with some drivers.
It's a prototype, still only a regular 3D print using infill. I wanted to see how it works out. Today I want to add a mounting flange and finally test it with some drivers.
- I had to make the picture grayscale, as the waveguide is a mix of blue and red parts and it looks rather silly - https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-7418506
Shouldn't affect the sound though (at least not for a measurement...)
Shouldn't affect the sound though
(at least not for a measurement...)
Yes, I'm pretty sure they are. I already measured the driver(s) with a completely different device and it was very similar:
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6736091
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6736434
It should be no problem to EQ any of this. It's the smoothest driver I have at hand. I expect it to cover the range 600 Hz - 20 kHz with ease.
- I even measured the driver in my wavefront shape experiment. Above 10 kHz it resembles the same FR shape:
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-7307030
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6736091
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-6736434
It should be no problem to EQ any of this. It's the smoothest driver I have at hand. I expect it to cover the range 600 Hz - 20 kHz with ease.
- I even measured the driver in my wavefront shape experiment. Above 10 kHz it resembles the same FR shape:
https://www.diyaudio.com/community/...-design-the-easy-way-ath4.338806/post-7307030
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The double humps are very indicative of almost all compression drivers. It's unavoidable with a voltage source. The other ones are likely diaphragm resonances.