621g near zero euro project

[claudiogan]

If you have a old 2.1 multimedia system with few euro you can:

- improve audio quality,

- test new audio tecnologies waveguide acoustic transformer and waveguide acoustic diffracting device from 665g project,

- make satellites become ominirectional.

More information at link Claudio Gandolfi - MDD, http://www.claudiogandolfi.it/dw/diy.pdf

At link 9 Best 621g images


My site is: Claudio Gandolfi - MDD
My current working hypotheses are described on the page acustica.

The last projects reported in the full range and planars-and-exotics section:
54m42 54m42 an MDD project (42 alveolar polypropylene wave guides on one driver)
other documentation is published at 54m42

34c9 Compact aluminum project
34c9 a MDD full range speakers.
https://www.claudiogandolfi.it/34c9.html

66c9 66c9 a low-cost MDD project (paper waveguide for educational use)
https://www.claudiogandolfi.it/66c9.html

22D7 Two drivers per channel for a 3D effect
22D7: four MDD systems for a 3D effect with omnidirectional speakers
https://www.claudiogandolfi.it/22d7.html

22M7 Simple and inexpensive wide-band rigid PVC project.
https://www.diyaudio.com/forums/pla...nidirectional-single-drive-4.html#post6006473
other documentation is published at 22M7.

22C71L8 One driver per channel with waveguides applied to the two sides of the cone.
https://www.diyaudio.com/forums/pla...nidirectional-single-drive-5.html#post6017746
other documentation is published at 22C71L8.

MDDHX135 an MDD project with the HX135 driver
https://www.diyaudio.com/forums/pla...nidirectional-single-drive-6.html#post6124020
other documentation is published at MDDHX135.

MDD3FE25 an MDD project with the 3FE25 driver
https://www.diyaudio.com/forums/pla...nidirectional-single-drive-8.html#post6170069
other documentation is published at MDD3FE25.

 

[rpi]

Interesting, reminds me church organ probably using the same acoustic principles.

 

[claudiogan]

The organ pipe is rigid and has the purpose to reproduce a specific frequency with a series of harmonics modifiable with the registers.

The waveguide of the 6XXg speakers is deformable from the sound fronts that cross it to obtain two objectives. Inelastic deformations dissipate energy and regulate frequency response. At the same time they dilate and compress the section of the waveguide emitting omnidirectional secondary sound waves attenuated, delayed and coherent with respect to the primary emission of the rear latop of the loudspeaker.