Assume that you can buy these two speakers for similar prices, what would sound musically more coherent and long term satisfying. The older Wilson's have always been thought of somewhat sterile and lean, where the new WP7 seems to be a lot more musical.
I remember reading a rewview ofa wilson speaker a while ago..the reviewer mentioned that the current watt/puppy 7 was vastly better in every way (except obviously bass extension) than the original grand slamm
also, fwiw, if you're a tweaker, the X-1s are probably out of warranty, which makes them an open target for user upgrades (a part here, a part there---and yes, i've not seen one speaker > 5yrs old that couldn't use a few parts).
In reality there's no competition between the two, if you have the room and the expertise to set them up properly, the X-1s are unbeatable! Watt/Puppy 7s are very fine speakers too and even if they're not a match for the X-1 you will get better results from them in a smaller room. Please note that both speakers are very revealing and would show up any weakness in your system. I know that the Grand Slamms have been accused of being sterile and lean but that's simply not true, most of the systems I heard them in were setup poorly and with harsh sounding ss electronics. You'll grow to love the X-1s if you know what you're doing.
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