Let your dealer guide you. If you're using a reputable Wilson dealer they will tell you what you need. But what's the hurry? Are they giving you a discount if you buy them together? Try without first. You might be pleasantly surprised.
Soix you're painting things with a pretty broad brush. If you talking home theater then I'd have a tendency to agree. If you're talking good 2 channel well then I'd have to disagree. And I've owned some pretty good systems (with and without subs) and heard some of the finest (with and without subs) :-)
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