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Cambridge Audio MSX Sub 300 主動超低音
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Description
Cambridge Audio MSX Sub 300 是 MSX 系列的大號超低音，官方定位是較大的房間同更進取的系統。核心數據與 Minx X301 吻合：300 W、8 吋主動單元加 8 吋被動輻射、31 Hz（−6 dB）、7.5 kg。新版外殼轉為啞面，網罩重新設計，高度 315 mm，比 X301 的 311 mm 略高。
一枚 8 吋前射主動單元，搭一枚 8 吋被動輻射盆，推動更多空氣，增加深度同輸出。對比 Sub 200，單元大一級、功放多 100 W，−6 dB 下限由 36 Hz 再落到 31 Hz。內置 DSP 實時控制頻響同輸出，聽得越大聲越要靠它保持穩定同清晰。Cambridge 強調以聽音調校，音樂準確度與功率並重。
接駁與 Sub 200 一致：低電平 RCA 輸入一對、RCA 直通輸出一對，分頻 50–200 Hz 可調，相位 0–180° 可調，有自動開機。官方建議主要配 MSX20，或放進規模較大的 MSX 多聲道系統。
尺寸 266 × 315 × 278 mm（W × H × D），重 7.5 kg。啞黑、啞白兩色，塗裝與 L/R 主動喇叭看齊。
設計重點
• 300 W 專用功放，動態餘量較大
• 8 吋主動單元＋8 吋被動輻射
• 31 Hz（−6 dB）–200 Hz
• 實時 DSP 控制頻響與輸出
• 分頻 50–200 Hz、相位 0–180°
• RCA 輸入及直通、自動開機
• 啞黑／啞白；Minx X301 新版
聲音性格
暫時未有 Sub 300 本身的獨立評測，以下按官方定位及前代 X301 的評測整理。比 Sub 200 下得更深，餘量更多，電影爆破同配樂的實體感更足，同時不搶走對白細節。前代 X301 在 What Hi-Fi? 系統評測中，處理電影超低頻有深度、有清晰度，與其他聲道融合良好；遇到極深沉的配樂偶有震聲，要把電平收低。波蘭《Audio》實驗室量到 X301 最大約 106 dB（50 Hz），以箱體尺寸計屬不俗。
規格
• 形式：主動式超低音
• 功率：300 W
• 單元：1 × 8 吋主動；1 × 8 吋被動輻射
• 頻率響應：31 Hz（−6 dB）–200 Hz
• 分頻：主動，50–200 Hz 可調
• 相位：0–180° 可調
• 輸入：低電平 RCA × 1 對
• 輸出：RCA 直通 × 1 對
• 自動開機：有
• 處理：實時 DSP
• 尺寸：266 × 315 × 278 mm（W × H × D）
• 重量：7.5 kg
對照
• Minx X301：前代，同 300 W、31 Hz、7.5 kg，高光黑／白
• MSX Sub 200：200 W，6.5 吋＋雙被動輻射，36 Hz，5.0 kg，箱體較細
• MSX Sub 300：300 W，8 吋＋單被動輻射，31 Hz，針對較大空間
• MSX20：官方首選搭配
媒體評價
• What Hi-Fi?（前代 Minx S325，X301＋5 × Min22，2023，並非 Sub 300）：以人聲形式出現的超低頻效果，X301 交代得有深度、有清晰度，與整套系統融合得好，有大銀幕的戲劇感。保留：極深的配樂會震，要調低電平。
• Audio（波蘭，Radek Łabanowski，2020，前代 X301 實測，並非 Sub 300）：最大音壓 106 dB（1 m、50 Hz），對這麼細的超低音算不錯。−6 dB 約 30 Hz；分頻設 65 Hz 時實測下限 28 Hz，比廠方的 31 Hz 更低。適合配細衛星喇叭，不是大型落地喇叭的對手。
• Trusted Reviews（同系 MSX20＋Sub 200 評測，2026，並非 Sub 300）：Cambridge 在 Sub 300 頁面引用這篇的系列評語：細小組合做到包圍感、低音緊實、音場闊、中頻豐厚。
• 評價說明：三條都不是 Sub 300 本身的評測，分別屬前代 X301 及同系 Sub 200，只作參考。
• 選法：客廳較大、做 5.1，或想低頻更深更有餘量，揀 Sub 300。空間細、主要配 MSX10，Sub 200 已經合適。
顏色與配件
啞黑、啞白。盒內：電源線、快速指南、安全指南及登記卡。
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