Firstly, I want to thank to @Baycode and Havi for sending me a free sample of theHavi B3 Pro1 in exchange for my honest review. Btw, I am not in anyway affiliated with Havi. I've burned my pair for more than 100 hours and the sound didn't changed dramatically during this period. 
 
 

 

 

 
 

 

 

 

 

 
 
ABOUT ME:  I'm a 37 year old guy who loves listening music as my forum signature tells. I listen to a wide variety of genre and artist from classics to metal.
My portable music journey started with an Aiwa walkman and bundled Aiwa earphone back in 90s and those were the days they were the best in this hobby I guess 
I had several DAPs, IEMs, earphones and headphones since that I haven't listed all on my profile here. 
 
 

 

 
 
Accessories: Havi B3 Pro 1 has a lot of accessories which includes 3 sizes of white slicone tips and double flange tips, 3 sizes of red bore tips, a pair of comply tips, earhooks, cloth bag, carrying case and a handkerchief.
 
Comfort/ Isolation: Havi B3 can be worn both cable down and over the ear style and they are pretty comfortable. Isolation is just avarage with both silicone tips and foam tips.
 
Sound: The new Havi B3 has definitely some improvements over the old B3.  Actually there is slightly fuller bass and the mids being slightly upfront with more detail. I've always found the mids on old Havi B3 a bit recessed for my liking and I can say that it is  not the case with the new Havi B3 anymore.
 
Without amping: Well if you are planning to use them with your smartphone or some daps with weak headphone out, unfortunately these aren't for you since they sound thin and lifeless without an amp or powerful source. However AP100 or Fiio X3 drive B3 just fine. 
 
Amping: Amping gives the sound some authority and makes the sound fuller and reveals the details. So I think amping is a must to truely enjoy its sound. Otherwise they will sound too quite and lifeless as I mentioned before. 
 
Bass: The bass on the Havi B3 Pro 1 is pretty flat, and organic and reproduces the recording very well. It is well controlled without spilling into midrange There is no midbass bloat I could detect and it is pretty fast indeed. Actually the bass is pretty linear on Havi B3. There is only a little subbass presence missing which makes them great for metal, acosutic and classical music. But that doesn't mean they are bad for techno or pop. Bassheads should look elsewhere!

Mids: This is one of my favorite on B3. Vocals are so natural and are reproduced with stunning clarity, and reveals the micro details very well. You can hear the timbre in the singer's voice, Seperation and layering between instruments is very well done. Vocal and timbre are the strongest aspects of this IEM. Hearing vocals and acoustic gitar is a pure joy on B3.
 
Treble: The treble is revealing with very good extension and has a great sparkle to it. Let me say it is my favorite IEM after RE0. The treble is not harsh by any means and there is no sibilance to speak. 

Soundstage/Imaging: This is by far one of the most open sounding IEM I've heard. It is almost out of head experience and has a 3D soundstage.You can hear every instrument clearly. 
 
Conclusion: I'm very happy to see that Havi improved the B3. I can easily recommend this IEM to anyone who wants an analytic IEM with a great soundstage and does have a powerful source or amp to reveal its full potential.  

First I want to thank @DJScope and @golov17 for making me aware of the Monk. I'm using the Monk as my primary earphone from the first day I've got them. Because this is not an ordinary earphone that is bundled with some Chinese mp3 players. It was a quite shock when I first heard them. Actually I didn't expect the Monk to be this good and addicting. Now I'm addicted to its sound which makes me forget my other IEMs. No, I'm not kidding. These are so good with a beautiful midrange and bass which isn't expected from an earphone. 
 
ABOUT ME:  I'm a 37 year old guy who loves listening music as my forum signature tells. I listen to a wide variety of genre and artist from classics to metal.
My portable music journey started with an Aiwa walkman and bundled Aiwa earphone back in 90s and those were the days they were the best in this hobby I guess 
I had several DAPs, IEMs, earphones and headphones since that I haven't listed on my profile here. 
 

 
 
SOUND: 
I had some earbuds when I first got into this hobby. Sennhesier MX200/400/500, MX270/271/471, Hisound PAA-1, some other unknown brands. I remember myself sitting in the balcony and living audio nirvana paired with my Meizu M6 SL a few years ago. Then I first got my IEM which was Sennheiser CX300 and never go back to earbuds again. And never thought I would buy and earphone and enjoying it like before. They are all lifeless when you get into the IEMs world and there is no going back at least for me until I listened the Monk!!!
 
Well, I prefer mid-centric sound with good treble quality and quantity. I'm definitely not a bass head and always stay away from bassy and V shaped sound. That is why RE0 is still one of my favorite IEM. Honestly I wasn't expecting the Monk to sound this good when I order them and thought "why not they are only $5" however I was shocked when I first heard them. Wow! They were unbelievable for what I paid and I was hearing some beautiful natural sound with good seperation and detail and bass. That was just out of the box impressions. Oh sorry it should be "out of nylon bag impressions" not box since it come in a nylon bag. 

  It was seriously a good earhone which has some potential so I let them to burn in for 9 hours.
 
They were a bit muddy in the mids and bass a bit loose at first but it changed dramaticaly after some burn in. What grabs me in the Monk is the naturalness in the mids and life-like vocals. The treble is just perfect for me not upfront or recessed and has the perferct extension. I can swear I could hear some deatials I didn't know they exist in some songs. The presentation is lively and 3D but never fatiguing. I felt like I was in the concert when I listening to Deep Purple's - Perfect Strangers. Listening guitars is a pure joy on this song on Monk. The guitars have an amazing bite and crunch like Grado headphones, they are so natural and beautifully rendered. Overall mids have a perfect fullness not too thick or thin just have the perfect thickness that gives life to both male/felmale vocals. It has wonderful timbre. 
 
Bass is punchy and quite detailed for an earbud. I wasn't expecting especially this kind of bass. It is beatiful and never owerhelming the other frequencies. It doesn't have the ear shaking sub-bass but what it does it does it right. Some can find them a bit bassy but could be easily fixed with thinner foams or cutting a bigger hole on the foam or wearing them over the ear as on my avatar. I think with thinner foams and over the ear style they are more balanced. 
 
I also liked the treble presentation of the Monk. You don't hear any sibilance definitely. The tone is wonderful not too sweet or cold. It has good decay and presentation. 
 
After having a good time with Monk, I decided to go back to my IEMs.Well, let me say it was a shocking experience for me! Before the Monk I was a big fan of Audio Technica and CKR9. When I put CKR9 back, it sounded like a cheap IEM with screaming mids and some peaks in the mids and highs. I could only listened them for a few minutes. I don't know why maybe my ears are adjusted to the Monk's sound. RE0 was so lifeless. Is there something wrong with me? I don't know. 
 
 
 
CONCLUSION:
Well, this is an earphone you shouldn't miss with an unexpected sound quality. For me listening to Monk is like listening to a good quality speakers and they get the highest recommendation from me if you still couldn't decide. I really appreciate Lee's effort to make the Monk for such a low price and his magical tuning. I now wonder how Zen 2.0 sounds. 
 

 

 

 

These are definitely a significant upgrade from IM50. The mids are more in balance with bass and treble. Mids are a bit recessed compared to its sibling IM50 but still forward but more balanced and more detailed. I heard much more detaiIs in songs with these which I was missing when listening to IM50. It has also more sub-bass and treble quantity. Soundstage is also bigger on IM70. Only con; the low mids seems a bit recessed which sometimes makes male singers sound a little bit unnatural compared to IM50 but it is still great.

This IEM is vocal oriented and so they are especially for vocal lovers. It is clean, detailed and upfront. This is not a basshead IEM instead it is punchy, detailed maybe a little slow on some really fast tracks but generally it is quite involving and fast. There is no midbass bloat I could hear so there is no veil in the mids. The guitars especially sound amazing on these and also acoustic instruments sound very natural. As I said before this IEM is mid-forward so the vocals are in front of the stage while you are listening to your favorite band. But this is not bad thing at least for me as I love its vocal presentation. Both male and female singers sound very natural and life-like and it has very good timbre. It has a monitoring like presentation overall.The treble while not forward, extends quite well and there is no sibilance to speak of. This is a good thing especially for long listening sessions. My only gripe is that the treble could be more upfront and wish for a little more subbass.