John,
Sorry I didn't see this until today. Here are a couple of thoughts:
~ Both rooms are pretty nice sizes.
~ I wouldn't immediately dismiss the room with glass walls. Conventional wisdom is not to use such a room, but 2" wood blinds (e.g., Hunter-Douglas) could make that room surprisingly successful. If the windows are double glazed vacuum/gas sealed panes, they may not be as bad for the sound as you might expect; reflection would be the worst offender and that can be ameliorated with the blinds and with some ceiling panel treatment.
~ The 18x12 room is always going to be unbalanced one way or another. 12' is not too narrow for your Thiels placed on the narrow wall at the fireplace end. Narrow end of the room placement might give you the best balance to your sound because the the opening to staircase and dining room then will be at the rear of the room (rather than on one side) and will act minimize sound wave reflection and give you the effect of a much deeper room for bass extension.
Good luck!
Rush
Sorry I didn't see this until today. Here are a couple of thoughts:
~ Both rooms are pretty nice sizes.
~ I wouldn't immediately dismiss the room with glass walls. Conventional wisdom is not to use such a room, but 2" wood blinds (e.g., Hunter-Douglas) could make that room surprisingly successful. If the windows are double glazed vacuum/gas sealed panes, they may not be as bad for the sound as you might expect; reflection would be the worst offender and that can be ameliorated with the blinds and with some ceiling panel treatment.
~ The 18x12 room is always going to be unbalanced one way or another. 12' is not too narrow for your Thiels placed on the narrow wall at the fireplace end. Narrow end of the room placement might give you the best balance to your sound because the the opening to staircase and dining room then will be at the rear of the room (rather than on one side) and will act minimize sound wave reflection and give you the effect of a much deeper room for bass extension.
Good luck!
Rush