Again this is my test rig and while calibrated, it is not compensated, nor is it directly comparable to anyone else’s measurements. For that reason, I ran back to back tests using the three to see what the differences were. I think the obvious question is how does the Zsn Pro compare to the Zsn and its progenitor the Zst. My notes are based on the provided large tips as I know not everyone will have access to the Shure tips but for those who do, I recommend a swap. The good news is EQ and tips do a lot for mitigating that if you should wish to do so. I found that I liked what Shure large Olives did for the sound of the Zsn Pro as by default it is a little too mid-bass forward for my tastes. My sample does not have the mic, but that option exists for those who prefer one. The other end of the cable sports pre-formed earhooks with clear hooded bi-pin connectors. The Jack is the standard 3.5mm TRS 90º connector standard on all KZ cables these days. (If anyone at KZ is listening, please, please, please move the splitter up!). This makes the cable entirely more tangle prone than it should be and would be easily cured by moving the splitter about 8 inches further up the cable toward the earpieces. The splitter is moved upward about 2 inches from the position of the splitter on the Zsn (good news) but the cable is 2 inches longer from the splitter to the earpieces (bad news) so on balance it is in the same (too low) spot it was on previous versions. It is well made with a 4 strand braid below the splitter and twisted pair above it. I found the Zsn Pro really did not scale particularly well so those using a phone or tablet are probably getting the same experience as those using a dedicated DAP or AMP. Nominal Impedence is listed as 24Ω with a sensitivity of 112dB/mW making the Zsn Pro easy enough to drive using low powered sources. I think the truth is somewhere between the extremes. I do think it mellowed the treble a bit but know some insist burn-in doesn’t exist while others swear by it. Titanium coated dynamics have a reputation for needing some time to burn-in and I found the ZsN sounded somewhat different after 100 hours or so, so I put the Zsn Pro on a diet of white noise for 72 hours after initial impressions. The impedance is listed as 24Ω with a sensitivity of 112dB/mW making the ZsN Pro even easier to drive from smartphones or tablets than its predecessor. The ZsN Pro uses a 2nd generation 10mm titanium coated diaphragm dynamic driver along with a customized 30095 balanced armature that has become a mainstay of their recent product line. (my guess is owing to the change in faceplate). It is a more solid fit than the Zst which tended to shift a bit and nearly identical to the Zsn although weight is about 1gram different with the pro being slightly heavier. For those who haven’t tried either of the pro’s predecessors, the pro is mid sized and sits firmly in the ear without a tendency to shift during use. Size is nearly identical to the Zst or Zsn so if you have tried those, expect this one to sit similarly in the ear. I like this arrangement as it stabilzes the connection if it does mean regular cables look a bit silly when used with the Zsn Pro. The bi-pin connector is the new style KZ has gone to with the Pin sockets being raised on the shell and a matching hood being present on the cable. Nozzles have a slightly forward and slightly upward rake wtih a pronounced lip and provide for fairly deep insertion. Venting is accomplished by a single vent at the lead edge of the faceplate by the screw and a single vent in the center of the dynamic driver on the underside. Unlike the Zsn, only a single brass screw shows on the exterior. Build is also very similar to the previous Zsn with a colored plastic inner shell and a metal faceplate.
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