Many have built their own boxes like that for a few years on this forum with good results, apparently the guy just has the box measurements down good for building it consistently and has the time to crank them out. I'd think the box would sound similar to the BSW or JL box as they are all about the same volume, just the sub will be your choice in this case instead of having just a W1 trying to keep up. (no bigger JL subs will fit, depth wise)

I was always a JL guy myself, but they are still using that damned foam surrounds and every one I've had I have split the surround on. And I spend less money on the infinity reference and get cleaner bass with much more resilience.

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X5 pics

RIP 4.6is.....

2003 4.6is