Very bad sound, stock eartips you can throw away, but shells are comfy. So I gonna try to switch drivers with other earphones (maybe with Havi B3).

1MORE H1707 triple driver (passive radiator!) over-ear headphones: https://www.aliexpress.com/item/1MORE-H1707-Triple-Driver-Over-Ear-Headphones-with-Microphone-Super-Bass-Hifi-Gold-Headphones-Headset-for/32790901179.html

From Easy on Aliexpress.

Like I wrote in old topic - better go for Remax RM-800MD. They are just better than 4in1, with good bass (not bassy), treble (not piercing) and mids (nice soundstage). Little V-shaped, but natural. And they are comfortable, not like **** ;)

You can try Zero Audio BX700 Doppio. Great double BA in sq, but for me little disappointing in comfort.

Much better sq than xDuoo X2?

How else would I know?   @CoiL - 4in1 are brighter, more offensive on upper mids (but not harsh), not really universal sound, something like cheaper version of PMV A-01. RM800MD are more natural, with more emphasis on bass, also little V but still closer to neutral sound. Soundstage and detail...

Well... Remax RM-800MD are better and still under $50.

Kinera BAS02 was very nice (well, except wire), so it can be good deal.

Make your own connector for 4-pin mini-jack. Or use some paperclip etc. to constantly press button on microphone.

Nice, warm sound. Not the C10 level, but very enjoyable. Soundstage could be better and treble more extended, but for this price probably only Shozy Alien have better SQ (from what I have or heard). Good ergonomy if you are right handed. But it's Colorfly, so it's have few bugs in software. USB...

If you have warm source - yes, Macaw are better. Maybe on detail PMV are little ahead, but if you looking for sound-staging and airiness go for Macaw. Always you can buy Havi B3, but they are darker and with roll-off on highs so live instruments doesn't sound so good like on GT100s.

And all of them have bass boost on fq graph?   Quote: Macaws are great, but they need a lot of juice (desktop headphone amp really needed).

What "most reference IEM’s"?

PMV A01, but they need good isolation (foams or long silicons).

Cheap BA earphones have a lot less clarity and detailed sound than good DD earphones. So it's not about DD vs BA

Yeah... no... MEE P1 are 1DD earphones and they just destroy those BA+DD hybrids: Xiaomi Hybrid, **** DT3, Tingker K200, iValux Batte (10mm), PMV-A01.

You are so wrong...   - "Tony, there are rumors on headfi forum that you stop working on new firmware to xDuoo x3 and stop support at all, is it true?" - "Nope, that is not true. We are still selling X3 and still supporting X3, but I'm just tired of telling hundreds of people everyday why we...

I mean Z3000: http://www.aliexpress.com/item/2016-New-Arrived-Zhiying-Z3000-3units-Dynamic-In-Ear-Earphone-Metal-In-Ear-Earphone-PK-IE800/32664954505.html   And go for Zhiying. VJJB have better accessories, Z3000 sounds little better.   @Wokei - there's no real competition. Audeo are much...

VT66 are well balanced, not typical V-shaped like almost everything in this price. Nice dynamic and soundstage. Sometimes they can be little harsh on treble but still close to neutral sound.   Z3000 are v-shaped, but very clear and dynamic. Treble and vocals are rich, detailed and natural. Bas...

They are very nice. V-shaped sound, but mids are still fine. Under $20 those are one of four my favorite in-ear earphones (**** VT66, Takstar Hi-1200, VJJB K4 and Zhiying Z3000).

For X2 you need only amp.

PMV A01

Penonaudio

Something about Carot earphones: - Quasi Titta - you can choose: bad sound or very bad ergonomy. - Titta - they are nice, but too expensive (10-15 dollars less will be ok). Little too much mid bas, treble can be piercing, no accessories. - Super Titta - my Top 5. Top 5 worst earphones I ever...