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Cambridge Audio Alva Solo MM 唱頭放大器
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Description
Cambridge Audio Alva Solo 是一部 MM（動磁）唱頭放大器。2018 年以「Solo」之名推出，現時歸入 Alva 系列，產品編號 C10934 沒有改變。它只做一件事：把 MM 唱頭幾 mV 的微弱訊號提升到線路電平，同時按 RIAA 曲線還原頻響。擴大機沒有 Phono 輸入，或者想取代機內較普通的唱放，就是它的用途。
3.35 mV 輸入對應 300 mV 標稱輸出，1 kHz 增益 39 dB。輸入阻抗 47 kΩ、電容 100 pF，是 MM 唱頭最常見的負載。RIAA 曲線誤差 ±0.65 dB（30 Hz–20 kHz）。A 加權等效輸入噪聲約 0.09 µV。THD+N 低於 0.0025%，過載餘量超過 30 dB。
供電用開關式電源，配合表面貼裝線路板，目標是壓低交流聲同雜訊。次聲濾波在 15 Hz 下降 3 dB、斜率每八度 12 dB，專門清走舊碟磨損帶來的低頻隆隆聲。後板有一粒平衡旋鈕，用來修正唱頭左右聲道輸出不一致。
閒置 20 分鐘自動轉入待機，待機耗電低於 0.5 W。電源 100–240 V，各地電壓通用。最高功耗 10 W。
機身 176 × 48 × 132 mm（W × H × D），重 0.68 kg，體積大約一本厚身平裝書。灰色外殼。背板只有一組 MM 輸入、一組 RCA 輸出。不支援 MC 唱頭，沒有耳機插口；兩樣都要的話，看同系 Alva Duo。
設計重點
• 專用 MM 唱放，2018 年原名 Solo
• 增益 39 dB，47 kΩ／100 pF
• THD+N <0.0025%，訊噪 >90 dB
• 開關式電源、表面貼裝線路
• 次聲濾波（−3 dB @ 15 Hz）
• 後板平衡旋鈕
• 20 分鐘自動待機，100–240V
聲音性格
帶一點中低頻暖度，質感柔滑如絲，高頻分得清楚細緻。取向是音樂感豐富。底噪極低，後面擴大機音量開大，背景依然乾淨。Technic3D 聽出中頻稍為內斂，人聲略退後，呈立體，節奏強烈的歌會修得圓一點。德國一本音響雜誌就形容它開揚又有結構，並說配高頻較收斂的唱頭特別合適。
規格
• 形式：MM 唱頭放大器
• 唱頭支援：MM
• 增益：39 dB（1 kHz）
• 標稱輸出：300 mV
• 輸入靈敏度：3.35 mV（對應標稱輸出）
• 等效輸入噪聲：約 0.09 µV（A 加權）
• RIAA 精度：±0.65 dB（30 Hz–20 kHz）
• 訊噪比：>90 dB（輸入接地，參考 1 V 輸出，20 Hz–20 kHz）
• THD+N：<0.0025%（1 kHz，20 Hz–20 kHz 頻寬）
• 輸入阻抗：47 kΩ
• 輸入電容：100 pF
• 過載餘量：>30 dB
• 串擾：>85 dB
• 次聲濾波：−3 dB @ 15 Hz，12 dB／八度
• 功耗：最高 10 W；待機 <0.5 W
• 電源：100–240 V AC
• 尺寸：176 × 48 × 132 mm（W × H × D）
• 重量：0.68 kg
媒體評價
• Technic3D（德國，Gerd Büsse，2018，94／100「sehr gut」，評測時名為 Solo）：聽音測試中是「音色和諧與細緻描寫的大師」。量度數據滿分。結論：頂級唱放不一定要花大錢。保留：中頻略收。
• 德國音響雜誌（2019 年 11 月號，經 testberichte.de 引述，刊名待確認）：性價比評「überragend」（出眾）。近乎無底噪，擴大機可以放心開大，聲音紋絲不亂。只用 MM 的話，是性價比冠軍。
• 德國音響雜誌（2018 年 8 月號，經 testberichte.de 引述，刊名待確認）：做工精細的 MM 唱放，可平衡聲道差，聲音開揚而有條理。性價比 5／5，稱它「Preis-Hammer」。
• 選法：只用 MM 唱頭、經擴大機聽，Solo 已夠。將來可能換 MC，或者想夜晚直接插耳機聽碟，一步到位揀 Duo。
顏色與配件
灰色(Lunar Grey)。附電源線、用戶手冊。
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