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So, the sub-woofer makes that much of a difference?

Yes.

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I don't like the booming of most rap songs, but I know it's important for movies.

The 500 will do much more than just add boom to rap songs. You want a quality sub that will give you proper bass at all frequencies.

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I just didn't think the 2 inches would matter much.

There's also the DSP Amp, Amp power, Room Trim, SPL and cabinet size. The 350 is good but the 500 is that much better.

60's & 80's are very similar but you won't gain as much improvement going with the 80's opposed to the 500 in my mind. Yes, I've heard them all

High Gloss Cherry
M60 VP150 QS8
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