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Are they really Yuin components though?
Is he using another little-know (and much cheaper) brand and selling them as Yuin?
Does Yuin really sell their gear for other people to Mod?
The housing is definitely the same as the Yuin PK series. There are no markings on the earbuds except for the L and R. They do sound different from the PK2, but to my ears the difference is mainly the soundstage being deeper. There's no loss of detail or anything. Rather you get more detail becuase of the improved depth and sense of instrument placement in the soundstage. However, you do lose much of the great mids from the regular PK2. The overall sound character of the PK2 mod would be a PK2 where you are moved further back from the stage. You lose the intimate feel but instead get a better overview.
I have always experienced the PK2 as very 2D in its presentation. I really like the mids and the airy quality, but at the same time I love deep soundstages, like on Blox TM7, Sennheiser MX980 and vintage earbuds such as Aiwa HP D9 and Sony MDR-E252. To my ears. there's a definite depth in the soundstage on both the AP8 and PK2 mod that's lacking in most current earbud models.
Overall, the build quality of both the AP8 and PK2 mod feel like very high quality. I'd say they feel more professional than the Blox earbuds (even if they don't reach the same level in sound). The AP8 must be made from counterfeit ATH EC700 parts that the seller has got cheap (ATH EC700 is an older clip-on earbud model from Audio Technica). The housing appears to be the same as on the ATH EC700 and there's the ATH logo on the Y splitter and on the plug. If I didn't know better, I would mistake them for a new ATH earbud model.
I don't know how the EC700 sounds like. I do have the CM700, which is the regular earbud model released around the same time as the EC700. I don't know if the AP8 sounds anything like the EC700, but it sounds nothing like the CM700. CM700 has got much smoother mids and a more clear quality to its sound. The AP8 sounds more rough around the edges, as if the mids aren't fully "tamed". But while the CM700 has got a wider soundstage than the AP8, it doesn't have much depth. The AP8 has got good depth and okay width. For something that costs around $10 it sounds amazing.
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How is the size of the Dasetn Audio AP8 compared with the Yuin PK3?
Got the MX760 but am thinking about replacing them with some PK3 because they are smaller, more confortable and faster to fit.
The AP8 are about as big as the MX760 and bigger than the PK series housings.