Naim Uniti Atom 對決 Cambridge Audio Evo 150：兩款一體式串流擴大機比較

前言

一體式串流擴大機的魅力持續攀升，因為它們把整套系統塞進單一機箱。網路串流機、DAC 與功率擴大機全都住在同一個精巧機身裡，你只要接上揚聲器就能開始播放。

Naim Uniti Atom 與 Cambridge Audio Evo 150 是這個概念最令人信服的兩個例子。一款是鞋盒大小的 class A/B 設計，額定每聲道 40 瓦。另一款是 class D 設計，額定每聲道 150 瓦，以 Hypex NCORE 模組為核心。兩者都是串流擴大機，兩者都容易相處，也都引出同一個問題：到底哪一台比較好？

這個問題比表面看起來更難答。這兩款擴大機的性格確實不同，強項不同，優先考量的重點也不同。誠實的答案是，比較好的選擇取決於你的揚聲器、你的空間，以及你喜歡怎麼聽。

這些擴大機實際上能做什麼

超級整合式擴大機的魅力很單純。你在一個機箱裡同時得到串流、數位類比轉換與放大，這意味著少花心思在線材與器材搭配上，多花時間聽音樂。

The Naim Uniti Atom gives access to Roon, TIDAL, Qobuz, and Chromecast, which in practice covers anything that runs Chromecast, including services like SoundCloud. Setup is quick: a power cable, a network cable or Wi-Fi, and loudspeaker cable, and you are running in under ten minutes.

The Cambridge Audio Evo 150 covers the same streaming ground. It is also designed to be an all-in-one integrated streaming amplifier where you simply add loudspeakers.

聲音性格：細節對上驅動力

這兩款擴大機追求的不是同一種聲音。

The Cambridge Audio Evo 150 pulls more of the finer detail out of dense electronic material. It sounds more stately, with better focus lock and therefore better image specificity. Paired with a pair of stand-mount speakers, it produced the widest and deepest soundstage of the two, and it came across as more internally spacious.

The Naim Uniti Atom is plainly the more lively sounding piece. It offers more straight-ahead rhythmic expression and more dynamic punch, and it is more predisposed to extracting maximum drama from a track. If your listening leans on momentum and drive, that character is exactly the point.

The difference shows up clearly with acoustic material. The Cambridge amplifier’s smoother top end suits quieter, more nuanced recordings well. The Naim is more of a lean-in listen, while the Cambridge is more of a lean-back listen.

設計、尺寸與手感

在觸感這一點上，Naim 佔了優勢。

The Cambridge unit is the slightly larger of the two, but it is also the lighter one. The Naim is squat and heavy, largely because it is a class A/B design with a substantial toroidal transformer inside, something the class D Cambridge does not need.

The Cambridge has a genuinely useful trick: substitute side panels are supplied in the box. You can remove the patterned black panels and fit a pair of walnut panels instead, which changes how the amplifier sits with your furnishings. It is a small thing, but a thoughtful one.

The Naim’s standout physical feature is its volume wheel on the top panel, one of the best in the business. The Cambridge uses two concentric wheels on the front, with the black inner wheel handling volume and the silver outer wheel handling source selection. The arrangement is neat, but it does not feel as good in the hand.

控制、遙控器與日常使用便利性

遙控器這件事評價兩極，而且原因很實際。

The Naim ships with a backlit remote, which means you do not have to point it at the amplifier for it to work. The Cambridge remote is infrared, so you do need to aim it, and its buttons are thin and small. The backlit buttons on the Naim are easier to live with.

The Cambridge GUI is just as good as the Naim’s overall. One small frustration is the sizing of information: on a Toslink input, the sample rate is shown in small type next to a large input logo, which is hard to read from a listening position. That is a detail worth knowing if you plan to check signal lock from across the room.

The Cambridge claws back ground on input handling. Many streaming inputs on both amplifiers auto-detect, so starting playback in Roon, Spotify, or TIDAL switches the amplifier over automatically. On the Cambridge, the outer silver wheel also lets you rotate manually through every input, including the hardwired ones, which makes it the friendlier option for less experienced users.

連接能力與輸入介面

在彈性這方面，Cambridge 明顯勝出。

The Evo 150 includes an MM phono stage. It is not an exceptional phono stage, but it is not a poor one either, and it sits at a reasonable working level for a moving-magnet cartridge. It also offers balanced analog inputs. That matters if you run a turntable through a phono stage some distance away, because balanced cables handle longer runs better.

The Naim Uniti Atom does not include balanced inputs, so a longer balanced run from an external phono stage is not an option.

Worth noting on value: the Cambridge Audio Evo 150 is a few hundred euros cheaper than the Naim Uniti Atom.

揚聲器搭配與空間契合度

搭配揚聲器在這兩款器材上絕非中性的動作，你選的擴大機應該跟著你擁有或打算購買的揚聲器走。

The Naim Uniti Atom paired particularly well with the larger floorstanding speakers on hand, where its rhythmic drive and punch had room to work. The Cambridge Audio Evo 150 paired particularly well with a pair of stand-mount loudspeakers, where its wider, deeper soundstage and detail retrieval came through most clearly.

Both amplifiers are small enough to sit on a sideboard or a low shelf, and both keep a room looking like a room rather than a sound lab. For listeners who care about the physical footprint of their hardware, that is a real part of the value.

購買建議

這兩款擴大機都不是針對沉迷升級的玩家。一旦買了一台，傳統意義上幾乎沒什麼可升級的，因為串流機、DAC 與擴大機都已經底定。它們是為那些想設定一次、之後就忘了硬體存在的人而生。

這正是它們的強項。一體式器材中，製造商已經替你理順了串流部分、轉換器與擴大機之間的協同，所以你真正需要思考的連接只有揚聲器線。這省去了不少從分體器材組系統時的糾結。

如果你的優先考量是更活潑、節奏感更鮮明的表現，並且重視配重優美的音量控制和背光遙控器，Naim Uniti Atom 是更令人滿意的選擇。如果你想要更寬更深的音場、更滑順的高頻來聽原聲素材、唱頭放大級、平衡輸入、可自行更換的側板，以及更低的價格，Cambridge Audio Evo 150 的說服力更強。

把擴大機搭配到你實際擁有的揚聲器上。這一個決定對你的滿意度，會比規格表上任何數字都更有幫助。

結論

這兩款超級整合式擴大機做的是同一件事，只是從不同方向抵達。Naim Uniti Atom 偏向驅動力、衝擊感與有觸感的控制。Cambridge Audio Evo 150 偏向細節、空間感、彈性與性價比。

無論哪一台，都會以一單機加一對揚聲器取代一整排分體器材，也都會讓你用更少的麻煩、從更多來源播放更多音樂。依照聲音性格與輸入介面來選，你不太可能後悔這個決定。