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Cambridge Audio Alva Duo MM／MC 唱放連耳機放大
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Description
Cambridge Audio Alva Duo 是 MM／MC 兩用唱頭放大器。2018 年與 Solo 同期面世，當時叫「Duo」，現歸 Alva 系列，沿用 C10935 編號。相對 Solo 多了兩樣：動圈（MC）唱頭輸入，以及一路耳機放大。黑膠可以經擴大機出喇叭，也可以深夜直接戴耳機聽，整套音響不必開機。
MM、MC 各自一對 RCA 輸入。MM 負載 47 kΩ，MC 負載 100 Ω，電容同為 100 pF。增益 MM 39 dB、MC 60 dB；MM 3.35 mV、MC 305 µV 輸入，都對應 300 mV 標稱輸出。RIAA 誤差收窄到 ±0.3 dB（30 Hz–20 kHz），比 Solo 更貼曲線。等效輸入噪聲 MM 約 0.09 µV、MC 約 0.08 µV。訊噪 MM 逾 90 dB，MC 逾 70 dB。過載餘量逾 30 dB。
前面板：電源鍵、MM／MC 選擇鍵、6.35 mm 耳機插口，加一粒偏向一邊的大音量旋鈕，只管耳機音量。後面板：兩組輸入、一組 RCA 輸出、接地柱、小型平衡旋鈕；標示字正反都印，由上面望落去接線也方便。
開關式電源的切換頻率設在可聽範圍以外，用來避開交流聲。次聲濾波 −3 dB @ 15 Hz、每八度 12 dB，清走舊碟的低頻隆隆聲。20 分鐘沒有訊號便自動待機，Trusted Reviews 指此功能可以關閉。待機低於 0.5 W，100–240 V 通用，最高功耗 10 W。
設計重點
• MM＋MC 兩組獨立輸入，前面切換
• 增益 MM 39 dB／MC 60 dB
• RIAA ±0.3 dB
• 6.35 mm 耳機放大，獨立音量
• 次聲濾波＋平衡調校＋接地柱
• 開關式電源，切換頻率在可聽範圍外
• 2018 年原名 Duo
聲音性格
厚身、帶暖，但暖得有分寸，不會糊。拍子穩，強弱之間拉得開，靜段同爆發段落差明顯。音像立體，主角穩穩站在正中。低頻有重量，人聲細節同個性都清楚。高頻取態穩陣，邊緣略圓；要最利落的起音。轉用耳機聽，同一種闊而暖的性格照樣保留。
規格
• 形式：MM／MC 唱頭放大器，內置耳機放大
• 唱頭支援：MM、MC
• 增益：MM 39 dB；MC 60 dB（1 kHz）
• 標稱輸出：300 mV
• 輸入靈敏度：MM 3.35 mV；MC 305 µV
• 等效輸入噪聲：MM 約 0.09 µV；MC 約 0.08 µV（A 加權）
• RIAA 精度：±0.3 dB（30 Hz–20 kHz）
• 訊噪比：MM >90 dB；MC >70 dB（參考 1 V 輸出）
• THD+N：MM <0.0025%（1 kHz）
• 輸入阻抗：MM 47 kΩ；MC 100 Ω
• 輸入電容：100 pF
• 過載餘量：>30 dB
• 串擾：MM >85 dB；MC 75 dB
• 次聲濾波：−3 dB @ 15 Hz，12 dB／八度
• 耳機輸出：6.35 mm，帶音量
• 功耗：最高 10 W；待機 <0.5 W
• 電源：100–240 V AC
• 尺寸：215 × 48 × 159 mm（W × H × D）
• 重量：0.95 kg
對照
• Alva Solo：只收 MM，沒有耳機輸出，RIAA ±0.65 dB，HK$1,800
• Alva Duo：MM＋MC、耳擴、接地柱，RIAA ±0.3 dB，HK$2,800
• Azur 651P（MM／MC）：舊 Azur 系列 MM／MC 唱放，屬比較對象，並非官方前代
• CXA81 Mk II：沒有唱放，Trusted Reviews 的 Mk II 評測直接建議加配 Duo
媒體評價
• What Hi-Fi?（5 星，評測時名為 Duo MC/MM）：唱放表現足夠拿五星，耳擴是額外驚喜。規格齊、厚身、有動態，形容它「as classy as a matinée idol in a smoking jacket」。結論：揀它不會錯。
• Trusted Reviews（Simon Lucas，2019，評測時名為 Duo）：有動態、細節多、暖得悅耳。細節、動態餘量、立體聲對焦三方面「wants for nothing」。保留：高頻稍為圓潤。
• eCoustics（Lauren Halliday，2023，與 CXA61 同測）：Alva Duo 把整套系統的水準拉高。體積細，是最容易入手的升級之一，推薦給第一次升級音響的人。
• 選法：用 MC 唱頭，或者想唱盤直出耳機，選 Duo。只用 MM、經喇叭聽，Solo 已經足夠，可省 HK$1,000。
顏色與配件
灰色(Lunar Grey)。盒內有電源線、用戶手冊及安全指南。
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