Please don't circumvent the autocensor.
The primary issue is the redistribution of half the energy to the rear below some frequency.
I concur. I don't know if it's a second-language thing or just deliberately obnoxious, but this user frequently makes haranguing posts like this, bordering on breaking the first forum rule, in my eyes.
The response on the datasheet is measured on a large panel (IEC baffle) and that's not the case of a speaker cabinet: Seas and Audax are an exception to this rule.
Anyway, that's the DSA215 in your box: brown line is the FR accounting the baffle step loss at LF; dash line is the DA FRD file.
HF section at 1m (Dash line is the DA FRD file)
And that's the TW in your box (Dash line is the DA FRD file)
Infinite ?
So , this all shows the drivers + the reflected sound of the panel the drivers are mounted on ?
What would happen if the baffle was constructed of something anechoic ? Or a spherical baffle ?
I suppose the joining of the front panel would also be a factor.
PS - the Mission speakers use a "krinkle" soft thick vinyl laminated to the baffle. It does not seem to be a perfect
reflective surface.
Yes ,no need for this. I'll drop it (whatever ??). I don't block - I'm tough...
OS
@ostripper
Yep
Yes, it calculates the modifications of FR according to the panel size and the Sd of the driver: it's quite accurate till the driver acts as a piston, but it does not consider the shape and/or the material of the cone that could improve the on/off-axis FR. You can also simulate strange front panels by modifying the number of corners: see this image from VCad manual.
See also here for the diffraction of different solid shapes https://www.aes.org/aeshc/pdf/how.the.aes.began/olson_direct-radiator-loudspeaker-enclosures.pdf
Yep
Yep
Yes, it calculates the modifications of FR according to the panel size and the Sd of the driver: it's quite accurate till the driver acts as a piston, but it does not consider the shape and/or the material of the cone that could improve the on/off-axis FR. You can also simulate strange front panels by modifying the number of corners: see this image from VCad manual.
See also here for the diffraction of different solid shapes https://www.aes.org/aeshc/pdf/how.the.aes.began/olson_direct-radiator-loudspeaker-enclosures.pdf
Yep
Reflective behaviour is related to wavelength, so a small wrinkle of a few fractions of millimeters will not affect frequencies in the audible range (from 17 m to 17 mm wavelength).