UiiSii C100 – Review

UiiSii C100

UiiSii C100

| 10 mm Driver |

? UiiSii C100, also called UiiSii Little Demon, the most budget friendly earphone from UiiSii. The UiiSii C100 are part of the C models of UiiSii’s earphones and are placed right below the UiiSii C200, which we have already reviewed (check the UiiSii C200 Review). UiiSii is a brand with a wide range of models and from our past reviews you might have seen that we usually find them to be pretty good, see for example the UiiSii Hi705 Review which has metallic housings and a microdriver or the UiiSii HM7. The UiiSii C100 are constructed in plastic with the same plastics quality as the UiiSii C200, the housings are very light weighted and have a narrowing back end. Inside the housings there is a 10 mm dynamic driver, which is a diameter slightly larger than many average earphones. The cables are thick, very rubberized and do an excellent job against tangling problems; the cables feel very robust and durable. The cable bifurcation section also holds an inline microphone and a 1-button control allowing you to play/pause music, skip songs and answer/reject calls; the control has a switch on the front to change the UiiSii C100 compatibility. You can buy the UiiSii C100 in the following colors:

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UiiSii C100 - Review

Tests & Scores



UiiSii C100 weight in ounces and UiiSii C100 weight in grams.

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Accessories & Packaging

Unboxing the UiiSii C100 you will get 2 extra pair of eartips, everything comes inside a rectangular box very similar to the one of the UiiSii C200 and UiiSii HM7.


UiiSii C100 - Accessories
UiiSii C100 – Accessories


Bass & Sub Bass

The 10mm dynamic driver of the UiiSii C100 provides a good bass response with punchy mid-bass and very deep sub-bass depth while still not sounding boomy or muffling everything. The fun and energetic bass style of the UiiSii C100 will cover anyone’s bass desires with no issues. Applying an EQ, mid-bass gets punchier and sub-bass deeper but sub-bass starts to get saturated. The UiiSii C100 went through our extreme bass tests managing up to 50% of a Fiio E12 Mont Blanc maximum power while being set to high gain, bass boost ON and applying our basshead EQ. As a result they greatly increased their punch and depth with a mild basshead rumble but their sub-bass was distorted. If you are searching for a basshead result after an extreme amplification the KZ ZST or the Pioneer SE-CX8 and Sony MDR-7550 / Sony MDR-EX800ST are among the better options.


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Mids & Vocals

The UiiSii C100’s mids have lower vocals that feel good and energetic enough with lower mids a bit recessed but not distant and with warm sounding mids. Higher mids are not recessed nor forward and do not sound harsh. With an EQ, lower vocals sound wonderfully clear but higher mids start to sound a bit harsh.



Highs & Treble

Highs of the UiiSii C100 are not too dark nor very bright and offer a very mild level of detail. Piercing highs and sibilance are not an issue with them. Using an EQ, highs sound more spacious, brighter and gain some more detail too but sibilance can start to show up.



UiiSii C100
UiiSii C100


Sound Leak

The amount of sound leaking out of the UiiSii C100 is not too strong and will most probably blend with normal city noises but if you decide to listen to your music at a very high volume they could be heard by nearby people. Using them on very quiet situations will require that you set a pretty low volume on your music; if you are looking for an earphone that excels at this matter you should check the KZ ATE.



Sound Isolation

Sound isolation is very good and substantially higher than most average earphones; anyway for an absolute isolation you might require to crank up the volume a bit.




The UiiSii C100 are very light, due to their shape-size are very easy to handle and offer a secure fit. All this factors add up to a comfortable experience with no worries about fitting, pain or discomfort issues.



Response to Equalization

The response to custom EQs was effective but some problems also arised. Bass got punchier and deeper but sub-bass lost quality; mids gained clearer lower vocals but a bit harsh higher mids; highs sounded brighter and more detailed with also a bit of sibilance.


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UiiSii C100
UiiSii C100

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Scores Scores

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Frequency Response (raw)

UiiSii C100 Frequency Response

UiiSii C100 - Frequency Response
UiiSii C100 – Frequency Response

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UiiSii C100


Driver Unit10mm
Power CapacityUnknown
Impedance16 ohms
Frequency Response20-20,000Hz
CordY-type, round cord
Cord Length1.2m
PlugStereo mini plug
Supplied Accessories2x Earphone tips

We highly discourage anyone from trying to apply our testings to your own earphones, the risk of damaging or permanently breaking your iems is absolutely probable to happen. With our standardized equalization and amplification tests we push the limits of the earphones to the extreme. If anyway you decide to do so, we cannot be held responsible of the damage done to your equipment. Do it at your own risk.

UiiSii C100




One thought on “UiiSii C100 – Review

  1. Had the usiisii hm7 n loved it but got stolen last week
    got this c100 cause are very cheap n am loooooving them

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