Hello guys, I'm engineer Andy from DUNU. DN16’s near 10 months development is close to finish. It can’t wait to be published. And I want to share some thoughts with you. 2010 April I have been assigned to develop 8 models of DUNU and required to achieve “SM3” (the sound quality of Sennheiser, the fashion style of Monster and reducing price to their 1/3). Among these models, DN-16’s design is completed and trying to reach IE 7’s hyper-bass sensation（subwoofer like experience）. It took 10 months of R＆D. Its appearance designed of flame is crafted by 3D CNC. Beyond several experiments, we finally find a method to put it into mass production. About sound, the housing is determined to be airtight design. (When the air in the airtight housing, the inhale vibration resonant disc pressure will be greater than outer of the housing, so the disc playback would be smaller; Therefore it will give you the hyper-bass experience) just as the diagram shows. The housing of IE7 has ventilation hole which has the effect of bass damping. It makes the air in the housing can adjust pressure with the damping. With the large housing size, it provides more space for vibration resonant disc to function. Air spring has greater push power and it will offer greater hyper-bass and bass with feel clear but not dull. See the following graph. This mission makes me feel like I have to use local cannon plus 2m gun barrel to fight German tank(Sennheiser), sigh. German or Japan vibration resonant disc material, like Liquid crystal and bio membranes, some of them are not available in local market. Compare with Synthetic membranes, these materials are more elastic, flexible, with short response time and strong penetration power. Our factory used to OEM for oversea brand speaker. The material is merely provided by them. So I had great pressure on this task. Through several months efforts, from Craving for vibration resonant disc (enhance the steel strength) adjust the thickness or height; we keep repeating the trying and error process for tuning, along with adjusting vibration resonant disc, cone, coil weight, magnetic force and the power of driver unit, etc. we also use the inner damping to adjust the balance among lows, mids and highs and changing the design of the housing which is applying for patent now. Finally we got a figure that can compete with the German tank (Sennheiser). As the diagram shows： Wow！ It’s really a cheerful outcome. I just can’t imagine that we can defeat the German tank with local canon (Sennheiser)(my personal thought). And if I have the chance I would like to display it for you guys. Last year, I got an order that indicates DUNU is aiming to achieve SM3, the sound quality of Sennheiser, the fashion style of Monster and reducing price to 1/3. In the meantime, we develop 8 models. Four of them are on sale right now, and the other four, DN-14 (China red), DN-15 (blue and white porcelain), DN-16 (Hephaes - Flame) DN17 (Butterfly) were postponed. DN-14’s sound is confirmed, but not with its outer crafting. DN-15 art craft is ok and is tuning right now (for company’s higher standard than before). Maybe it is for the intense competition on market. This year we also have three new models developing along with 13C 2nd, S01 2nd, Dynamic two units which is applying for patent, and custom 3 unit Balanced armature project, etc. It seems like we will have a really tight schedule and challenging year. See the promising products listed below. The hearing experience from DN-16 on POP like Lady GaGa, Beyond, May Day （Two Chinese POP bands）is awfully great. Those hyper-bass demanding music on DN-16 is extraordinary. I hope my company can arrange sending some samples to those who enjoy music and earphones. I will discuss the details with my company about how to do it. After all, it is the audience’s approval that a professional earphone most needed. By the way, I would like you to evaluate my design to see if it can compete with the German Tank (Sennheiser). Overall DN-16 has sufficient bass performance; it’s clear but not dull. The treble is balanced, full, smooth, and with great penetrating power. Middle-Low’s elastic and penetrating power are just a little behind IE7’s.