Semi-Open根本沒甚麼可以選，beyerdynamic DT-880 Pro或Fostex T50RP-Mk3吧，事實上Semi-Open這個價位也只有這兩款而已。 *更正、還有AKG K240MkII。
推一下舊文… 最近為了展開新的創作計畫而買了新耳機，東西送到家一段時日卻還沒測試， 因為我收到貨時突然想起來我忘了確認新耳機的阻抗，看了一下發現是32 Ohm... 感覺跟錄音介面Prism Sound Lyra 2的搭配不是很妙， 可是Prism Sound的說明書與官網都沒有提供Lyra 2 的耳機輸出阻抗， 寫信去問直到今天才收到回覆：Lyra 2的耳機輸出是100 Ohm... 好，這跟本串沒有直接關係， 我要講的是Prism Sound回信時有提到他們的Sales and Marketing department使用什麼耳機，以及一些建議， 各位有興趣的的話可以參考看看： "Our pro products have been designed with a high impedance HP out specifically so the unit works with as wide a range of headphones as possible. i’m afraid we don’t have a list of specifically recommended headphone models that we can direct you to. What I can tell you is that the Prism Sound Sales and Marketing department have and use all the following headphones…" Focal Utopia Audio Technica ATH-M70x Sony MDR-7506 Focal Elear Audeze LCDX Audeze LCD3 Beats By Dre Pro "These cover a wide range of impedances and all of them work very well and we’re happy with every single pair. If we added in the huge variety of HP’s we use in the office as well as the ones our customers use we could probably cover most phones on the market! Conventional wisdom would say that you should match the impedance of the headphones as closely as possible to the impedance of the HP amp (the Lyra). At the end of the day the biggest factor here is your personal taste and what you’re looking for from a set of “cans” (in terms of their “sound”) and just how loud you want them to be. When I listen to headphones, I listen to them at quite a low level. Others I know listen to them earsplittingly loud (which would make the Audeze that I LOVE not the best matched choice…). So, as long as you avoid some of the more (read as very) boutique and notoriously hard to drive Electrostatic and plannar magnetic headphones, I have no doubt you’ll be happy with whatever you choose." …不對呀，Audio Technica ATH-M70x的阻抗是35 Ohm，可以拿來接Lyra 2? Audeze LCDX更低只有20 Ohm… 等等、關於阻抗匹配我難道搞錯了什麼嗎?
我看的回覆是 理論上以匹配的祖值為佳 但即使不完全匹配也是可以 造成的結果 以你的品味決定 可能還是拿著系統去耳機店 比較容易找到需求 實務上和理論有些差距 我本來是想進來看看 有沒有人討論真空管耳擴模擬 想要常駐開啟在電腦上 這好像太冷門了....>_< 投票區列出的耳機 我在耳機店泡了一下午 只有se846能夠噴出我要的高頻諧波爽感 mesa dual rectifier的經典音色 其他款耳機總有一層網隔著 甚至像是擋了一塊吸音棉 真不能忍
阻抗匹配一定要低出高入，也就是耳機輸出阻抗一定要小於耳機本身的阻抗， 不然除了音質會有問題外還會因為電流供應不及導致耳機輸出燒掉。 https://chichengjuanhe.blogspot.com/2016/10/blog-post.html 想要找英文資訊的話搜尋"headphone impedance lower than amplifier"之類的關鍵字即可。 這也就是為什麼這幾年推出的錄音介面不論高中低階，其耳機輸出幾乎都小於20歐姆的緣故， 因為現在的耳機阻抗為了配合行動裝置變得越來越低，錄音介面為了遵循低出高入原則也必須跟著降低， 所以才會看到像RME Babyface Pro有0.1 & 1歐姆雙耳機輸出， 而Neumann MT 48 (Merging Anubis) 的耳機輸出更只有0.035歐姆。
阻抗不匹配或者是沒在輸出端接上負載(load)導致輸出燒掉，應該只會發生在真空管類的 power amp 。原理有人有比較專業的說明，我就不獻醜了 家用音響或者是錄音介面只要不是用真空管放大的電路設計，基本上不會發生 no load burn，耳機輸出也不會因為接了阻抗不匹配的耳機就燒掉。 祝音樂的探索路上可以因為這樣更放寬心