KZ ZST X



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So now that I made improvements to lớn the ZS3, I thought I"d tackle the ZST.It"s one of my least favorite KZ IEMs, due to lớn its shrill ear-piercing treble. It can actually get painful depending on the tuy nhiên I"m listening to, so they"ve sat unused pretty much since I got them. I figured I"d take a crack at modding them, since I really had nothing to lose.

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I thought I would share my findings, since I know there are many others that also dislike the ZST due lớn its piercing highs.It dawned on me while doing the ZS3 mod that I could possibly use foam khổng lồ tune the ZST. However, I didn"t want to lớn block any sound from the dynamic driver, so I had khổng lồ be careful how I went about making changes. I only wanted khổng lồ address the treble, which meant only tinkering with the bố driver that"s mounted right at the nozzle opening.I stumbled upon a wonderful article from Tyll
InnerFidelity (http://www.innerfidelity.com/content/how-balanced-armature-receiversdrivers-work). After getting an understanding of how tía drivers work, I saw that some bố drivers are fine tuned through the use of filter material in their tip. Eureka!Since the foam was the easiest thing lớn try, I used that 1st. & low & behold it did the trick! The mod is simple, only takes a few minutes, & is completely reversible.How does it affect the sound? There"s still plenty of treble (but the treble is buttery smooth after the mod), and all of the shrillness that was present before is gone. I can listen to the ZST for hours now with no pain or fatigue. And there is no impact on the luscious bass và midrange that the ZST has. This thing went from my 2nd least-favorite KZ IEM to lớn one of my vị trí cao nhất 5.
So if you"re one of those people lượt thích me that disliked their ZST, give this simple hack a try. You have nothing khổng lồ lose.1. You"ll need a small piece of open-celled (acoustic) foam. You can get the foam from a number of places:An old foam earbud cover (new is best, not used and crusty)From the inside of an old full-size tai nghe earpadThe foam that protects a lot of items during shipping (mostly electronic and computer products). It"s got peaks & valleys arranged lượt thích a bunch of pyramids.The "tear off foam cubes" inside of Pelican & other hard casesThe foam used for acoustic soundproofing tiles used in sound rooms, recording studios, etc (usually has peaks và valleys arranged lượt thích a bunch of pyramids, or sometimes alternating grids of long triangular tube shapes).The small pieces of foam you removed from the plastic tube of the ZS3"s nozzle for the "ZS3 Slater Mod"The inside foam from the KZ tai nghe hard case (which incidentally is the EXACT same foam KZ used inside of the ZS3 LOL). >.When I say you only need a SMALL piece, I mean REALLY SMALL (I trimmed a much-larger-than-needed piece from the corner of my KZ hard case as you can see below):
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2. Now that you have your tiny piece of foam, it"s time khổng lồ cut it down into (2) near-microscopic sized pieces.You know the writing on the side of the ZST that says "ZST - HIFI Armature"? Cut it to the exact same kích cỡ as the word "HIFI" written on the side of the shell
(same height, same length).It"s important lớn cut both pieces the same size, or else you may over up with a minor treble imbalance between the 2 sides.You over up with a ridiculously small piece, like about 1/3 the form size of a single grain of rice. Look at it in relationship lớn the date on a penny & a pencil lead:
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3. Now that you have your foam pieces, take a sewing needle và CAREFULLY pop off the metal screen on the end of the ZST nozzle. Pry it up from an edge, but be very gentle, because the mesh could mangle and deform if you man-handle it with too much forceful poking from the needle. They"re held on with a very weak gooey adhesive, và come off easily. Both of my mesh screens came off perfectly with no damage:
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4. Now you"ll be able to lớn see the bố driver in the very over of the ZST"s plastic nozzle.At the very over of the ba driver itself is a little "hole" - that"s the bố driver"s nozzle, which is where we"ll be inserting the foam pieces. Just tuck a little bit of the foam inside the over of the tía driver nozzle using the tweezers (you"re only trying to get it started in the hole). Next, take your sewing needle & carefully tuck the rest of the foam down inside of the tip of the cha driver. Don"t jam the crap out of it in with the needle or you may damage the cha driver - just tuck it in (using the needle) with barely any pressure and to hardly any depth (we"re talking 1-2 millimeters here folks). It may take a few tries with the tweezers and needle, but it will go in no problem. It will be helpful to lớn have really good eyes (or a magnifying glass) và bright light khổng lồ illuminate everything. If you have poor close up vision, have someone with good eyes và steady hands help - the opening of the tía driver is barely larger than a "." on a piece of paper!If you"ve done it correctly, here"s what you"ll over up with:Partially Inserted:
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Partially Inserted Closeup:
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Fully Inserted:
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Fully Inserted Closeup:
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5. Once the foam is fully inserted inside the tip of both tía drivers, take your tweezers & replace the mesh nozzle screens back into the ZST nozzle. The gooey adhesive around the inside edge will keep the mesh screen in place with no additional glue needed. All you have to vì chưng is lay the mesh inside the end, make sure it"s centered & doesn"t overhang any part of the rim of the nozzle, & then gently push on it with your finger lớn get it lớn stick securely.6. Put your ear tips back on, và reinstall the cables (making sure lớn insert them in the proper direction by paying attention lớn the rounded vs flat keyway of the plug & socket). If you insert one of both backwards you will end up with phasing issues and/or the plugs be loose và fall off during use. Here"s a photo illustrating the correct orientation:
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That"s it; you"re all done!Total time from start lớn finish is under 10 minutes.If for whatever reason you don"t like the mod, you can easily remove the foam from the cha driver by plucking the foam with the sewing needle và removing it completely with the tweezers.Let me know if you have any questions.- Slater