I have the VR4GENIIISE. The rear tweeter adds depth and focus to the sound stage. You would adjust according to your room set up. Experiment with it. Example, if the speakers are out quite a bit from the front and side walls you may like a little more volume. I have mine bi-wired with cables that bring out the best from each module. Have cables that make the mid's and highs sound great but aren't the best for low end resolution and vice versa.
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