I've got an 18" nightshade. D1, custom long coil, extra spyder, thicker tensils, newer terminals. Built as an SPL sub for me.
But as far as SQ on it, it is still a very clean sounding subwoofer. Very accurate and will play a wide spectrum of frequencies cleanly.
They are an exceptional driver, and the customer service you get from Jacob is #1 in the game. A++, and you can actually reach him through the main #, every single day Mon-Fri... I like being able to dial one number and having my sponsor right there willing to help me in any way he can, great guy.
You'd love the subs...very well built..and can be customized like the Fi's to your liking. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
I'd say SQ on them is above averaage, but everyones opinion of a SQ subwoofer is different. Most people woould say its an SPL geared driver...which it is...but it still has very clean output.
Hope this helped a little bit.. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif