Chào bạn, tôi đang có dự định mua 1 cái cho DAC. Tôi đang phân vân về Amanero của China, liệu sẽ gặp khó khăn nào ở thời điểm hiện tại về nâng cấp Firmware? Tôi nghe nói Hãng ở Ý đã khóa và khong cho flash hàng Chna?
Hello, regarding the production of MBL360° speakers, all I can provide you is that you can choose the magnetic core of a commercial speaker driver. The requirement is that the power must be large enough, because the efficiency of this type of unit is very low and it often needs to be used at high power. Only under certain circumstances can sufficient sound pressure be achieved.
@@jackyhoy8245 thanks Jack. I’m actually mostly wondering about how you made the individual petals, the metal pieces that make up the driver. I think I have an understanding of how MBL does it from watching various making-of videos but am interested in your experience as a DIYer :)
@@mushyfooproductions Hello, I actually have another idea about the production of petals, and maybe MBL will follow up later. It’s just that the aluminum alloy petals will have resonance that is difficult to deal with. I wish it were made of carbon fiber like the tweeter and midrange unit. I'm planning on rebuilding the subwoofer and making it out of carbon fiber.
@@jackyhoy8245 did you use acoustic foam on the back of them like MBL do? I assumed/hoped that would deal with most of the resonances, as well as the copper rods. Excited to see how you do it with fiber though whenever the time comes!
@@mushyfooproductions The production of this mid-bass unit has not yet been put on the agenda. Making petals from carbon fiber is a key consideration. At present, aluminum sheets are attached to the inner wall with materials to eliminate resonance and sound-absorbing cotton. The outer copper rod is also to eliminate the resonance of the aluminum sheet. But the petals become very heavy, seriously reducing the efficiency of the mid-bass unit.
