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That's what I'm hoping!
The most audible difference between V1 and V2 is that V2 has more linear "smoother" horizontal dispersion. It isn't "wider" - just more linear at off-axis angles. This makes the speaker sound more spacious in most rooms. That and the V2 is a bit warmer with just a small bit more midbass compared to V1. It doesn't matter if using with or without a subwoofer, the differences are not in that frequency range.
Same reason why someone would go from say a Lamborghini Huracan to a BMW M8... Different use. The LX sounds like a large tower speaker when fed enough power, it has great detail and is very spacious, with shocking dynamics. However, it doesn't quite reach the levels of detail or intimacy that Sierra-2EX V1/V2 can deliver with certain types of music.
EX crossovers are designed to match with our EX woofers. If your brother has Sierra-2's (not Sierra-2EX), it is best to stick with the original Sierra-2 crossover - which uses a very different woofer.
LX will definitely NOT cause you any listening fatigue. While the Titan dome is a metal dome tweeter, it is an Aluminum / Magnesium alloy. The addition of Magnesium, which is extremely stiff and light, pushes the breakup modes (ringing) to nearly 30kHz, well out of the range of human hearing. This characteristic is what makes Beryllium tweeters so popular (a true Be dome pushes the resonance mode to about 35kHz).
Combining that characteristic with its extremely wide dispersion - this tweeter sounds more like a RAAL ribbon than even other brand ribbon tweeters. If you don't experience listening fatigue with your Sierra-2, you definitely won't with LX
Wow, I’m happy I decided to swing by and see if anything was new on the forum. I was about to purchase LX upgrade kits for my EX V1s, but now think I’ll just upgrade them to EX V2s. I already have a pair of LXs, and variety is the spice of life, right?