could you rephrase your question? Didn't understand what your asking exactly?
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So you want to add a pair of 2Wq subwoofers without a preamp? It doesn't seem like it would be a problem. You would have to add the crossover in between the CD player and the amplifier, but I don't really see any reason why this couldn't work.
With the level of resolution that you're getting, however, it would be in your best interest to build your own (or have somebody build for you) crossover modules. The ones from Vandersteen seem to dull details and kind of flatten out the music, but building your own with better parts could make for a great result.