Rick, that's about right, but another 4-5" can be added to that 23" to account for the width of the front baffle. If the purpose of giving a distance measurement is to indicate acoustic factors rather than simply describing general placement in the room, then the measurement has to made from the driver in question. Distance from the back of the enclosure to the wall behind or from the side of the enclosure to the side wall isn't meaningful in this context.

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Enjoy the music, not the equipment.