For music, the geometry is the same and direct-radiators are recommended. Bipole/dipole surround speakers are a hold-over from the DVD/cinema/Dolby recommendations.
Kr4 is correct as to what is recommended. However, few people can arrange their rooms exactly as specified. Also, bipole/dipole speakers work fine. As always, speaker type and placement makes a difference, but IMHO there is no hard and fast "right answer".
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