Head-Fi.org › Head Gear › Headphones › In-Ear › Universal Fit › Koss RUK 30K Noise Isolating In-Ear Stereophone, Black

Koss RUK 30K Noise Isolating In-Ear Stereophone, Black


Pros: solid-deep bass response with visceral rendering, balanced mids& trebs, price/quality ratio, well made, tangle resistant cord

Cons: very good soundstage but a bit narrow sometimes , the isolation not %100, pads not best fit ones

I tested it with Dr.Chesky's Binaural album and Depeche Mode flacs.


What I like most is of course bass response..it is more than enough, maybe a bit exaggerated, aggressive. Overall, I am really satisfied this excessive response in some genres.The only real problem it is prone to loudness noise of the record.. Maybe this is because the drivers are too sensitive. I am not that high end audiophile who can use technical terms to describe but this happens generally with lossless files...other problem might be ear pads for some.. smallest ones work fine but fit best no..the reason of isolation leak probably because of pads..I may change them with high quality ones.


Trebs rendering not detailed enough as basses but that does not mean bad  they are as good as it gets behind bass response..not that sharp though. Mids are all balanced and  has enough clearness in vocals and seperation of instruments.Timbre quality of course not as same as high end JVC  or Senns Come on guys..this unit costs approximately 20 bucks and within that framework it is absolutely magneficent piece of equipment ...a steal.


It is highly recommended to low budget hifi people like me who wants bassy in ear with good isolataion and tangle resistant cord which can be used on the go. Many over priced in ears I tested are not good as Koss RUK 30K.in terms of basses. It is not your dreams in ears but  cheapest thing very close to it. its price is unbeatable. It provides good solution for mobility in budget.It is not JVC HA-FX850 so you get much more from what you spent.


I really like listening chamber classics, rap,techno,new age and acid jazz records with this unit.It has stellar performance. Apart from those genres drivers have above medicore performance. I use another price/quality monsters Asus Xonar U3 and Fiio E17 . I can drive this unit (16 Ohm) with ease to 32-64 Ohm pro-gaming exiter mode and no problem I face till now. With that mode Depeche Mode etc..listening nearly above over-head quality of most respected brands' mid ranges.


It works REALLY well with mobile devices but it gains considerable resolution with more  juice like I stated above. This is one of the most satisfying purchase I've ever made.


Pros: Wide soundstage with good separations. Large and extra separated mids with complete acoustic. Powerful bass. 90% of the KDX200 is in here!

Cons: Compared to KDX200: Vocals sounds a little muffled & Treble sounds slightly dark (but more detailed somehow)

first things first, let me inform you that ruk30 shares nearly the same driver with kdx200 for one third of the price. can you imagine that ? wow :) it has got nearly the same bass & soundstage. the biggest difference is on the treble side. but it's really hard to decide which one is better. kdx200 of course sounds more refined overall but differences are very hard to notice. treble is definitely more bright thus sounds more realistic but kdx200 was suffering a treble duration issue as i mentioned in my review. interestingly, ruk30 does not have that!


thanks to it's big & good separated acoustics, details are not even a problem with them. you'll get back every detail you lost on the models with congested acoustic. the bass type & power is one of the best, while the soundstage is probably the best. only weak side of this one is the treble but despite that fact it's still better than a lot of models out there. which is a quite archivement for a product with this price.



excellently separated from mids. full of body & punch. on par if not better than brainwavz s1 & s5 which means it's slightly but certainly better than brainwavz r1 & vsonic vsd3/s. 



separation of instruments and overall acoustic of mids are complete. separation from vocals certainly better than brainwavz s0 and slightly better than brainwavz S1-S5. size of mids are very close to vsonic vsd3/s & ostry kc06a level, which makes it slightly better than brainwavz S series. instruments plays close to your ear are sounds a little recessed compared to vsonic g/r02 & brainwavz r1 but this is a common situation of bass enhanced earphones (including vsonic vsd3/s & brainwavz S series).



on par if not worse than vsonic vsd3/s. just like theirs, treble feels more relaxed than brainwavz s0 & vsonic g/r02 possibly due to slightly wider acoustic. but still on the same clarity & detail level with them (just like vsd3/s again). far from being a treble monster but far better than a lot of low resoluted, harsh or poor seperated models on the market.


Amplification Requirements:

close to none. easily able to reach high volumes with minimal bass distortion. brainwavz ap001 will be more than enough.


Equalizer Requirements:

comes fairly flat. 250hz amplification will forward drums and 1khz amplification will forward vocals (if you find them recessed). amplify 125hz for stronger bass but keep in mind doing so will prevent some deep bass flow.


Pros: The bass. Very responsive and clear with no bleeding pure bass awesomeness.

Cons: Bulky, muddled flat mids, non existent highs. Not even saved by burning in and equalizing. Simply misses the finesse and details of classical sounds.

Bass junkies will love these as it is probably the most prominent iems out there when it comes to bass. But after 120Hz you are into the bog of mids and garbled highs. RUK30 fail to deliver the details of you classical, folk, new age, fantasy pieces even when specifically amped and equalized for the details you hear from your over-ears, you will not be hearing them. 

No member lists contain this item yet.
Koss RUK 30K Noise Isolating In-Ear Stereophone, Black

Noise Isolating in-ear Stereophone

ModelRUK 30
TitleKoss RUK30
CatalogNumberList - CatalogNumberListElement00140247179607
Item Height2.9 inches
Item Length6.4 inches
Item Weight0.07 pounds
Item Width0.69 inches
Package Height0.71 inches
Package Length6.46 inches
Package Weight0.22 pounds
Package Width2.99 inches
PartNumberRUK 30K
UPCList - UPCListElement021299179604
Model Name/TypeMPNEAN/UPC
Head-Fi.org › Head Gear › Headphones › In-Ear › Universal Fit › Koss RUK 30K Noise Isolating In-Ear Stereophone, Black