The brand of Wei Shang Lu sounds should be familiar to players with a certain burning age. Slow work out, after the R02 silver line version, R04 collector's edition and other classic products, the long-standing Weishang has brought us the cost-effective twin brothers VS-K1 and VS-K2M. Several brothers have previously sent a K1 evaluation, so the K2M sense of hearing will be completed by me.
Whether it is K1 or K2M, its outer packaging is not a publicity. After K1's black and blue "Sen Hai" packaging, K2M's black orange packaging will be shot again this time? After the joke, objectively speaking, the packaging style of K1 and K2M is still consistent with the positioning.
The top of the front of the box is the logo of Weishang, and the empty packaging area can give a glimpse of the approximate appearance of K2M.
The earbud storage box and the equipment it supports are visible in the cutout below the front of the box.
The back is mainly the parameters of the earplugs, which are simple and clear.
The side is the manufacturer and its contact details.
The look after removing the outer box.
Due to the positioning relationship, K2M's accessories are also simple. One storage box, one pair of large, medium and small silicone sleeves, one pair of C sets, one clip, one manual.
The box is the most common one, just enough, you can put a little gadget like a cover.
Jackets in various colors (medium has been assembled on the plug at the factory).
Then there is the main character VS-K2M body. The shell part is basically the same as K1, and the aluminum alloy cutting process is adopted, but it is not polished. Although the sexy index is not bursting, it is good for anti-fingerprint. Workmanship is still OK, because the shell is made of metal, it is also more in the hand. Overall shape... um, one nuclear warhead.
The wire is OK, the elasticity is excellent, the hand feels good, and it is not easy to knot. K1 is a twist line, and the anti-stethoscope effect is better. K2M is more than K1 is the central MIC and call button. Unlike the K1's curved plug, the K2M uses a straight plug, which is probably the reason why the headphone jack for most mobile phones is not at the top or at the bottom.
The left and right channels of the earplug are respectively distinguished by blue and red, and there is no L or R logo or blind spot on the housing. Personally think that this is not too human, not all players know the blue left red right. It is recommended to add the L and R logos to the later versions.
The swaying metal casing of the filter section is very eye-catching.
Adjust your mood, breathe and put on earplugs. The sound of the first hearing is relatively tight, like the air trapped in a balloon. So I feel that everything is in the middle of the block, and the surrounding becomes a vacuum. High frequency, vocal lack of luster. I started to use the 2/3 usual volume to listen to the sound. After an hour, I didn't know if the plug or the earphones opened a little. I began to feel the sense of positioning, but the overall situation was still dark.
After about 30 hours of intermittent, I began to listen to the official voice. At this time, K2M probably gradually entered the state, and the judgment given has certain reference value. The audition player is mainly closed with XK, A7 and G708, EQ.
After a little opening, K2M gave me a lot of surprises. The most intuitive feeling is that the horizontal sound field is indeed open. When listening to the instrument, its positioning will be relatively open. It is quite a bit better than the original one, and the sounding parts are scattered. Although the sense of distraction is more obvious when listening to pop music, I still give a higher evaluation.
The vocals are still not bright, the position is a bit backward, with a little sand grain. Still lacking in color, not thick, not sweet, not poisonous, small and brittle, even slightly irony. I can't talk good, but I can't listen, I don't feel uncomfortable for a long time, and the plain is the most true.
The low-frequency part is more colorful, more crisp, and there is no reason to increase the amount of the earplugs because of the earplugs. Basically, it can be put in place, and the speed of collecting and collecting is also satisfactory. It has a certain intensity and a sense of form. This piece is quite interesting. The high frequency part is still dark, roughly unexpected. K2M is taking the middle and low frequency, so it is only natural that the middle and high parts are sacrificed. Fortunately, there is only a lack of extension and brightness, and the details and overtones are still decent.
K2M can't be said to be very transparent, still with some guilt. The analytical power is good, even if it can't be done in a nuanced way, it can do everything, and it is a moderate level. The audition process uses the silica gel and C sleeve of M. The latter will be more condensed in sound and better in sound insulation.
The appearance is simple but not unconventional, independent molds, good workmanship all reveal the sincerity of Wei Shang Lusheng to consumers. Although the packaging and accessories are going to save costs, only the sound performance of this item can be considered to be value. The performance of the sound field is more prominent than this price point, and the low frequency is also remarkable. In addition to the general pop music, listening to some instrumental music also has a good performance. For the price of 300 yuan, we really can't ask too much. After all, the overall performance of this earphone is above the price. Of course, the overall tone can be brighter. Without a stunning appearance and no exquisite workmanship, it can be said that Weishang is almost wholeheartedly working on the sound performance. If you don't control foreign brands, you don't control the appearance, it is very worth recommending to music lovers.
Finally, the individual estimates that the sound quality and direction of the two new products VS-K1 and VS-K2M are similar, but the two have different focuses in other aspects. K1's twist line is better for anti-stethoscope effect and anti-winding, and the bending insert is more suitable for general players. K2M is the first time that Weishang has added wire-controlled earplugs. It should be launched for popular mobile phones such as iPhone and S3. The price will be a little more expensive than K1. While listening to the music, it will not delay the call. In and out. However, the remote control part did not play a role in some old models of mobile phones during the test. We need to know that it is best to consult the seller or go to the physical store to listen to the decision.
Via In Pad PCB
What is Via In Pad? In shortly,via in pad is the via holes are at the SMD pad.The vias are very small,usually under 0.3mm.Why and how? First is there is no enough space to layout,you have to put the vias and holes closer even together.Second it helps thermal management and for high frequency boards,it may help improve signals.
Because the SMD pads are for SMD components loading,so the solder can not flow to inner layer or the other side when assemble.That is the most important for via in pad board.
How PCB manufacturers like us to do via in pad board? We will fill all vias with non-conductive epoxy and plate copper over it ,so the vias are flat same as others. Many PCB factories are unable to do such capability.
The key technology is how we fill vias and guarantee there is no any solder (surface finishing) in the holes.
Filled via in pad is a way to achieve intermediate density with an intermediate cost compared to using blind/buried vias. Some of the key advantages associated with using the via in pad technology are:
.Fan out fine pitch (less than .75mm) BGAs
.Meets closely packed placement requirements
.Better thermal management
.Overcomes high speed design issues and constraints i.e. low inductance
.No via plugging is required at component locations
.Provides a flat, coplanar surface for component attachment
Via in big pads are not a big problem.but for BGA,that is technology.As BGA pads are very small,10mil or 12mil,and there is no enough space.Manufacturing is not easy as other boards.
Via In Pad PCB
Via In Pad PCB,6Layer Via In Pad PCB,Touch Pad PCB,Via In Pad
Storm Circuit Technology Ltd , http://www.stormpcb.com