can't really determine whether different wire would help without knowing what kind of wire you use now . . . have you tried tweaking your speaker position?
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GET ASC "FRESCOES" AND TUBETRAPS, AND TREAT YOUR FIRST WALL REFLECTIONS (on EVERY wall). You'll never know what your system sounds like until you do this basic and integral procedure. Do this before you buy any other cables or components. That way, you can hear what they're doing also, when the time comes.