What? Proven how? Where? Let's look...... Here's the BL curve of a Peerless 12" XXLS. Well centered with a smooth, relatively symmetric and flat roll off at both ends: Peerless XXLS BL curve of the Peerless SLS 8" driver. Again, well centered with a smooth and symmetrical roll off at both ends: Peerless SLS8 Here's the BL curve of a CSS Trio8 with XBL^2. Coil appears offset about 3mm forward rather than being properly centered (one of the problems with these "exotic" motor designs is manufacturing consistency) and not as symmetric: Trio8 BL Curve BL curve of Adire Extremis with XBL^2. Ripple in the curve, not as symmetric, and again would appear off centered: Adire Extremis Adire's DUMAX of the 12" Brahma. Same results as above: Adire Brahma Dumax Please, explain to me the deficiencies of the two Peerless motor design in comparison to any of the three XBL^2 motors. Where are they? Because I'm not seeing them. And, for reference, there is nothing particularly special about the Lamda motor you were referencing earlier as far as "exotic" linear BL motor designs go. It's nothing more than a well executed standard motor topology AFAIK. And for reference, I run a Shiva-X as my subwoofer in my vehicle and have a pair of Trio8's waiting to be installed this spring/summer as my midbass. I also have six Exodus Anarchy's with XBL motors I plan to use in my HT, and when the 8" Anarchy's hit the market I'd like to grab a pair or three of those. I'm definitely not against XBL^2. But there is certainly more than one way to skin a cat, and more than one way to design a driver with a linear, well executed motor. Lastly, keep in mind when you listen to a subwoofer you are listening to more than just the subwoofer. You are listening to the subwoofer in particular enclosure in a particular vehicle with specific system settings. You might have listened to a subwoofer in a friends (or strangers) car. You might not have liked the sound of the subbass. But was it actually the driver you were listening to? No, it's not. You were listening to the entire system, which includes the affect of the enclosure on the response of the driver, the affects of the environment, as well as the affects any particular system setting(s). You can't properly evaluate the subwoofer itself under such conditions, as you are listening to far more than the subwoofer itself. I'm not telling you that a Fi Q is a great sounding driver....I've never listened to one. I'm not telling you that a Fi Q (or similar) is the driver for you....it very well may not be. But you don't seem to fully comprehend the entire picture, either from a driver design perspective or from a system response perspective.