[KRAMER C-HMU] 真才實學的設計，影音效果都很有說服力！

其實從 4K 世代進入 8K 之後， HDMI線的外觀完全沒有改變，採用一樣的端子結構，內部一樣是 19 個接點、19 股導體負責所有訊號傳輸，但是它所面臨的傳輸壓力其實是以往的好幾倍，首先想傳送 8K 訊號，器材的傳送和接收兩方都必須要配備 HDMI 2.1 端子，且它的傳輸資料率高達 48Gbps，足足是 HDMI 2.0 版 (18Gbps) 的好幾倍。過去假如是性能不夠好、做工不夠精良的 HDMI 線，就很可能在面臨 HDMI 2.1 介面時出現訊號傳不過或訊號不穩定的狀況。

而這時候會標榜 HDMI 2.1 版本的 HDMI 線，等於是廠商向消費者們掛保證，假如此線能夠符合 8K 的高規格資料傳輸，那面對現階段所有劇院的影像要求就如同小菜一疊，可以輕鬆過關，消費者買起來也會更安心。

C-HMU HDMI 線所提供 0.9m、1.8m、2.7m 三種長度版本，長度越長線徑就越粗。這款 C-HMU-9 線徑為 28AWG，能確保遠距離傳輸的訊號完整性。

導體線徑更粗，確保完整傳輸

確保完整傳輸那麼這麼多 HDM I 2.1 線材該怎麼挑選呢？

我想來自以色列的 Kramer 線材會是很好的選擇。實質上它們並非音響廠商，產品大部分屬於專業領域 (包含演播室與工程用途)，打開 Kramer 官網，會發現其產品含蓋 17 大類，其中的產品細項更是多到數不清，光是 HDMI 線也有十幾款！不僅廣泛被電視台、後製剪接室等專業場所運用，也在歐美的許多專業雜誌、展覽上拿過獎項，就連本社視聽室常用的參考 HDMI 線也是它們家的產品。

Kramer 既然是專業的角度製作線材，那當然以規格和數據為本，性能上也會比一般線材更為可靠，像是這次要推薦的這款 C-HMU HDMI 線，外表看起來相當樸實，和我們常見的「小黑線」無異，但卻完全符合 HDMI 2. 1 規格，具備最高 8K/60p 和 4K/120p 的傳輸實力。許多新穎的 HDMI 2.1 線材開始選用光纖導體，但這卻相當考驗傳輸晶片的設計，若不夠精良很容易影響訊號品質。有鑑於此，C-HMU 依然堅持採用傳統純銅導體，外部以 PVC 絕緣並加上三重屏蔽結構，把線材包得密密實實的，最外層再用黑色的 PVC 披覆層包覆，能有效降低環境中的雜訊干擾。

然而大家都知道，傳統導體的 HDMI 線一定會有傳輸距離的限制，這個部分 Kramer比劇院迷們更清楚，考慮到「傳輸距離愈長、信號損失愈大」的狀況，所以 C-HMU HDMI 線所提供 0.9m、1.8m、2.7m 三種長度版本，長度越長線徑就越粗，例如我拿到的這條線是 C-HMU- 9；9 呎 (2.7公尺) 的長度，線徑 28AWG，長度較短的 3 、6 呎線材，線徑則為 30AWG。透過更粗的導體達到線材更低的內阻，使訊號可以傳輸得更遠，比起多數音響線材廠商，以一種裸線製作多種長度的 HDMI 線，Kramer 這麼做雖然成本更高，但能確保遠距離傳輸的訊號完整性。

C-HMU 搭載了 Kramer 專利的 K-Lock 抗拉端子設計，這個接頭除了採用耐腐蝕性的 24K 鍍金設計，表面有一種突起結構，它具有彈性可以牢牢咬住插孔。

導體線徑更粗，確保完整傳輸

再來HDMI線端子的牢固性也是消費者很在意的部分，為此 C-HMU 搭載了 Kramer 專利的 K-Lock (K-PRS) 抗拉端子設計，這個接頭除了採用耐腐蝕性的 24K 鍍金設計，表面有一種突起結構，它具有彈性可以牢牢咬住插孔，據原廠表示，接頭插拔 10 次以內保有 6.8 公斤的抗拉力、插拔 100 次以內能維持 5.5 公斤的抗拉力，即使插拔將近 500 次仍能保持 3.5 公斤的抗拉力。意味著 C-HMU 適用於任何嚴苛的安裝環境，不用擔心線材未來鬆脫的問題。

結像緊密結實，立體感強烈

實際測試我將 C-HMU 連接於藍光播放機和 Sony 4K 液晶電視之間，跟社內的參考HDMI 線 (同為 Kramer 舊型產品) 做交叉比較。首先在測試畫面中，可以發現亮度略為提高，使得光影、明暗的對比變得更清楚，像是夕陽的階調層次更明顯，也能看到更多亮部細節，突顯出 HDR 的效果。在夜間的都市場景中，會發現暗位更黑，從東京黑夜中透出的霓虹燈、廣告招牌等等街景，以及街道上積水的倒影種種景象，色彩與燈光顯得更加銳利，立體感提昇許多，營造出更濃豔的視覺效果。

聲音的部份，當我將 C-HMU HDMI 線連接 Yamaha A8A 旗艦環擴，播放 4K 藍光軟體時，比起社內的參考線材可說是高下立判，可以明顯感受到全頻段的聲音能量提升了許多，音效的形體感更有密度，遇到環繞音效時，可聽見紮實的移動軌跡，聲音的強弱改變更鮮明。同時在更開闊的音場之中，使得電影中的音效定位向外托展開來，不再有擁擠放不開的感覺，使電影的層次感變得很立體，相較之下，社內的舊型 HDMI 線聲音就顯得較為溫吞，聲音形體不夠清晰。

價格親民、真才實學

市面上標榜 8K 等級的 HDMI 線很多，但是真正像 Kramer 這樣完全遵循規格與數據的廠商真的少之又少，實際使用也發現它在音效、影像的升級感都很有說服力。如果您想找一款價格親民、真才實學的 8K HDMI 線，那我想 C-HMU 絕對是最超值的選擇了。

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