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Just an update. Kinda stuck between the SP4 and the Zv.5. Feel like I can't go wrong with either though..

 

[Rambo 10+ year member]

I know you eliminated your other choices. And this isn't much help either. But I have 2 fi btl neo 15s, but I've been dragging my build for a while so I can't give you an opinion on them. I did however have the old fi bl 15s and loved them. But my box was less then optimal

 

[MrFoca]

I ran a 18 ZV4 to specs sundown gave me. It sounded good & all. Dropped a old DD in its box and did 2 db higher. Older technology beating newer & it wasn't even meant for the enclosure.

Sorry that's all the input I can give you. I just like to compare products and do tests a bunch. I myself have been looking into the BTL neos.