30/01/2014-09:31:45
RE: ARTEC 8170H une mini ONKEN à Pavillon
Bonjour,
La réponse de David Mc Bean sur le mode "piston" :
"For your VOT example, Hornresp can calculate the combined power response, but not the combined pressure response (which would need to take directivity effects into account). Determining the directivity characteristics of the combined response is not a trivial task - it depends on the relative physical positions, and frequency-dependent radiation patterns, of the two separate sources. For a bass speaker, directivity effects are not that significant, so the power response is a pretty good indicator of the performance that can be expected from the speaker.
Almost all loudspeaker simulation models assume that the driver diaphragm is a rigid plane circular piston. To take higher-frequency diaphragm resonance modes into consideration would be very difficult indeed. Most good bass and compression drivers are designed to operate in pistonic mode anyway, over their intended frequency range. This avoids the unpredictable consequences of higher-order diaphragm resonances.
Most Hornresp users find the predictions to be reasonably accurate, provided the loudspeaker (as built) is measured correctly, and closely matches the simulated design."
Phil.
La réponse de David Mc Bean sur le mode "piston" :
"For your VOT example, Hornresp can calculate the combined power response, but not the combined pressure response (which would need to take directivity effects into account). Determining the directivity characteristics of the combined response is not a trivial task - it depends on the relative physical positions, and frequency-dependent radiation patterns, of the two separate sources. For a bass speaker, directivity effects are not that significant, so the power response is a pretty good indicator of the performance that can be expected from the speaker.
Almost all loudspeaker simulation models assume that the driver diaphragm is a rigid plane circular piston. To take higher-frequency diaphragm resonance modes into consideration would be very difficult indeed. Most good bass and compression drivers are designed to operate in pistonic mode anyway, over their intended frequency range. This avoids the unpredictable consequences of higher-order diaphragm resonances.
Most Hornresp users find the predictions to be reasonably accurate, provided the loudspeaker (as built) is measured correctly, and closely matches the simulated design."
Phil.
Système Full Paper Cone : Foobar Ramdisk, VDAC 2, atténuateur passif Tocos, LM3886 dual mono, LM3876 à bat Li Ion, double Alpha15A H frame dipole "perfect 8", Fostex FE 126En en Dipole Acoustique Double, tweeter JBL LE26