I've owned both the CJ 17LS and the ARC LS15 preamps. Both pieces are excellent and I would highly recommend either unit. I doubt however that switching from the ARC unit to the CJ unit will change your system significantly. Having owned the W-5, I would recommend trying a new amp. Don't get me wrong, I like the Sim Audio amps, but it is all about finding the right match for your system, room and ears.
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