FYI - I played around with this last night. Setting the QS8s at 90 degrees doesn't work for me. The room that they are in is odd: 


|         TV                       |

|                                  |

|                                  |

|                                  |

|                                  |

|QS8              QS8|

|                                  |

|                                  |

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What was happening was that the right QS8 would reflect off of the left wall and it would sound as if the right channel was coming out of both QS8s. The left channel (having no opposing wall) sounded fine. When I angle them downward, this is mitigated somewhat. However, it's still a problem. Does anyone have any ideas?