im another that that thinks servo is NOT a deciding factor. i have owned many subs as well, including two Rythmiks. a F12 and a FV15HP. they sound great. dont get me wrong. its just that you can build a sub that sounds just as good without servo. honestly, my SVS PB13 Ultra had a sound that i preferred over the Rythmiks, but my quad DIY SI18's put all the ID subs ive had to shame for near the same price.
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