优点 - 良好的成像，快速灵活的声音，出色的乐器分离，中性声音特征，良好的细节和质感，极佳的价格。
缺点 - 声音略微干燥，不是超级多功能声音，中低音重量不足。
免责声明：当我有折扣或（非常罕见）免费产品以换取评论时你会知道的，所以另一次，我支付这个IEM因为我不是那么便宜的屁股，我的意思是，11/11 他们花了我8美元左右，所以是的，即使他们没有像我们说的令人难以置信的NiceHCK EP10便宜，我认为这是一个很好的购买。 关键是：我选择了我想要审查的产品，没有妥协，也没有BS。
关于放大：我很少使用放大器进行IEM，并且必须承认我需要使用具有99db sp的32ohm iem。但我确信它会扩大声场并澄清乐器分离，所以一旦我得出结论就很难回头。伊巴索DX90在高增益下并不需要放大坚韧。
VS SUPERLUX HD381：IMO是价格低于20美元的最佳价值IEM之一，可耻的未定，因此毫不奇怪，D4在各个级别的声音都低劣，特别是在声场和3D感觉和低音方面，它更重，更深入。 HD381感觉更加通风，而D4感觉拥挤且过于乐观。 D4的中频更多，但不那么通风，整体特征比HD381线性更强，D4更加细致但比HD381更具颗粒感。 D4的构建比HD381非常便宜的方式更好。
VS KZ ED4：另一次，它让D4的小声场感到羞耻，并提供更多的低音，但不是非常详细的方式，更多的邋type类型不是一个加号。 ED4更温暖，但提供更好的仪器放置，环绕你的头部，感觉更加身临其境，这是D4的一个很大的缺点，它太f as好像音乐急于呈现给你。 ED4的中频，即使有低音出血，感觉更宽，但它们缺乏细节。 D4的高点更多，并提供更多细节。
Pros - Good imaging, fast agile sound, great instrument separation, neutral soundsignature, good details and texture, excellent price value.
Cons - Slightly dry sounding, not an ultra versatile soundsignature, lack of weight in mid and low bass.
Ezaudio D4 Review :
Ezaudio D4 is a new comer in budget family and already have good reception among music enthusiast. In a overcrowded chi-fi iem market are they worth a hype? Well, if you can AMP them properly I will say yes, if you can’t they will not be as impressive. Let’s see why.
Disclaimer : You will know it when I have discount or (extremely rarely) free product in exchange of review, so another time, I pay for this IEM because i’m not that much of a cheap ass, I mean, at 11/11 they cost me around 8$ so yeah, even if they aren’t as much as a bargain as let’s say the incredible NiceHCK EP10, I consider these a good buy. The point is : I choose the products I want to review, no compromise about this, no BS either.
CONSTRUCTION & DESIGN :
With a light alluminium housing design take from Nuforce N700 iem, the D4 neither look fancy or cheap, but have an elegant low profil that hide a beautifull dynamic driver in it.
Cable isn’t bad as I like the nylon part wich I would have love it to be used for whole cable because the other ribbon part look cheaper and can create microphonic, wich is a serious drawback. L jack is a nice idea too.
About design, as the housing is very light, its a comfortable IEM that we wear the classic way, you can try wearing it over ear too to avoid some microphonic but it isn’t thinked for that style.
Gear used :
Both Xduoo being amped with Xduoo XD-05 for better result.
About amping : I rarely use amp for IEM and must admit that i’m surprise that I need to use one with a 32ohm iem that have 99db of sp. But i’ m certain it expand soundstage and clarify instrument separation, so once I conclude this its hard to go back. Ibasso DX90 at high gain do not really need amping tough.
SOUNDSIGNATURE is near neutral with hint of brightness in mids and extra push in upper treble. This is a mature audiophile sounding IEM for such a tiny price that can be an all arounder because even if not bassy it still have enough punch to give energy to beat driven track. For me, this a a well made bright sound that do not feel to agressive even if very fowards in its presentation.
SOUNDSTAGE isn't very big and is wider than deeper and can offer above average positioning of instrument, especially in this price range.
BASS do not go extra deep and lack in sub region but offer good mid bass punch and enough textured to feel realist. Still, it lack a little roundness and weight but offer a quite fast and tigh presentation. It do not bleed in mids section and using right tips is important to help the bass come alive.
MIDS are fowards and slightly bright, but do not create particularly invasive sibilance or displeasant texture. Vocal have good presence and texture and do not feel bloated or recessed, for example in Happy Rhodes song ‘’For we beleive’’ we can easily hear the back up vocal that stay in background while front vocal feel more immersive and wider, even if a little bright, it do not feel shouty and give a good musical presentation with the very clear classical guitar that accopany her. As well, for solo violon album of Hilary Hahn playing Bach sonata, it is a very enjoyable realist presentation with lot of space surrounding her solo playing, violin being well detailed and having great dynamic and tigh but impactfull decay, this is a very impressive full medium frequencies response treat.
HIGHS are quite present without being very sharp most of time, and perhaps being over shadowed by more present upper mids as we can hear the percussion but not in an extra clear way when instrumental is very crowded. It isn’t very sparkly highs, and layering being just average it do not help background percussions or details to feel alive. Still, it do not feel as having a treble roll off, because upper treble is quite clear and lively, wich mean you got plenty of microdetails for such a cheap iem.
VS SUPERLUX HD381 : These are IMO one of the best value IEM in sub20$ price range and shamefully underated, so its no surprise that the D4 sound inferior in every level, especially in soundstage and 3D feel and bass, wich is weightier and go deeper. HD381 feel more airier while D4 feel congested and too foward. Mids of D4 are more fowards but less airy, and overall signature more linear than the HD381, as well, D4 is more detailed but with a more grainy treble than HD381. Construction of D4 is way bettet than very cheap one of HD381.
VS KZ ED4 : Another time, it put to shame the little soundstage of D4 and offer more bass, but not in a very detailed way, more the sloppy type wich isnt a plus. ED4 is way warmer but offer better instrument placement that surround your head and feel more immersive, this is a big drawback of D4, it is too fowards as if music is in a hurry to present itself to you. Mids of ED4, even with bass bleed, feel wider, but they lack detail. High of D4 are more present and offer way more details.
Ezaudio D4 are sure not for everyone and its hard to suggest them easily because of a quite fowards treble that can be a drawback for some laid back music lover. Still, to have this level of details rendering as well as a near neutral soundsignature that have enough mid bass punch to give a dynamic presentation and that for 10 little dollars, I think its a great buy for iem collector leaning towards audiophile sound but less so for people searching for a bassy all arounder or suffering of treble sensitivity. Personally, I know I will not use these often, even if I admit I am impress by the maturity of its agile soundsignature.