The Gcon is a really strong sound quality sub for the money. That power is plenty for a Gcon, and they like sealed enclosures for sure. The Gcon might not have as much coverage as technically it is the newest of our model lines. The only main difference about the Gcon and any other SSA sub is that it does not have a solid pole. I have not listened to an HDS to compare, so I can't add on that question.
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That is because if I edit my sig, all links go poof. So it's out of date, but still has important links in it.