>Dipole and cardioid subs excite less room modes than omni subs: >http://www.kirchner-elektronik.de/~kirchner/DIPOL-CARDIOIDeng.pdf >http://www.linkwitzlab.com/Woofer%20accuracy.rtf
Uhm...doesn't that depend also on the sub position in the room? For example, I think that a sub positioned in the middle of a rectangular room would not excite any mode with an even modal index, but perhaps a dipole sub would excite some of them? (for standing waves, a node of pressure is an antinode of particle velocity) But I understand that a sub in the middle of a room would be quite an unusual position... On the othen hand, I believe a dipole very close to a rigid wall (axis perpendicular to wall) would probably have a very poor sound radiation efficiency at low freq - already poor for the dipole- since sound radiation to the back would cancel sound radiated to the front (I think it can be represented by the normal derivative of a Green function for Helmholtz eq. with homog. Neumann boundary cond., that is = 0 on the boundary- this is how in WFS it is possible to eliminate the dipole terms from the KH integral) Filippo _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
