How much without the sub, I already have a 10" sub to use and a alpine mrv m500 mono amp.
...let me clarify why I don't want to separate this last one... I designed this enclosure specifically for this sub. I designed and built the unloaded enclosures to be a little more universal by setting the mounting surface a little further back into the enclosure so that a sub's x-max wouldn't be compromise by slamming into the stock grill. Due to this, the depth of the enclosure was sacrificed slightly. This loaded enclosure has the mounting surface moved slightly more forward to give the sub a little more air space without causing any issues with x-max and the sub hitting the stock grill. There are a couple of other slight differences too, but just know this Eclipse sub and this specific enclosure are meant to be together.