cant say but now you get real sub bass without artificiality and discussions of filters. Some find it not fun enough and want more thump, but that sounds fake to me. the 846 I enjoy, but realize the fakeness of the subwoofer tech is there to expand what sound dynamic is impeded by physics of all iem, thus forgiven. So while 846 is substantively my favourite iem, once you try th900, its hard to go back. IMO.
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