Join Date: Nov 2007
Location: Gaithersburg, MD
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Yes, there is an issue with a layout such as you suggest. There will be a range frequencies where both the woofer and mid range are making sound. This can create additions and cancellations, lobing, that will change as the listener moves horizontally. What these frequencies are depends on the choice of woofer, mid range, crossover frequency, and crossover slopes. Just how audible this might be depends on many details, including the distance between the listener and the surround speakers.
An alternative is a 2-way surround speaker where the drivers are in-line with each other vertically. Because you seem to want as much bass as possible from surround speakers, I think a 2-way with a suitable 6½" woofer could work well.
Both designs are compromises. In my opinion, a 2-way is less of a compromise than the 3-way you described.