Coaxial Compression Driver DIY (CCDIY) discussion

[weltersys]

Also, the compression ratio is 8:1, which provides an airspeed of roughly 5,5 m/s at the phase plug with 91 dB, 400 Hz.

What do you think the compression ratio is on this annular diaphragm:

Any estimate of it's airspeed when the SPL is over 160dB ?

This speed through a non optimized, crudely printed phase plug could be the source. Still, It doesn't directly explain the peaks at 4 and 500 Hz.

The noise floor has those peaks, as do all the harmonics.

PS: as this design is related to the dcx464, which is patented. I'm careful with sharing details (drawings etc) which could cause indirect infringement of the patent.

Unless you plan to copy the all the patent details (annular diaphragm ect.) and sell the drivers, not much to be careful about.

Art

 

[newvirus2008]

Dear Ice cream,

You don't need to worry much about infringement unless you're planning on commercialising this work / result of yours. You could use the details in the patent for personal / research purposes without consequence.