AudioQuest PowerQuest 707 – 提升音質的電源淨化器

作者、編輯｜Volker Frech  攝影｜Simone Maier  翻譯｜Gemini  中文編輯校對｜巨禮小編

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Pure power for pure sound – the AudioQuest PowerQuest 707 offers this performance boost at a moderate price: Tailored filtering sections for source components and power amplifiers ensure a sound upgrade. The 707 also supports their ability to deliver peak power with a clever energy buffer – and its overload protection guarantees the safety of all devices. Our test reveals what this power purifier and its energy storage system can achieve.

純淨電源成就純淨音質——AudioQuest PowerQuest 707 以適中的價格提供這種效能提升：專為訊源組件與功率擴大機量身打造的獨立濾波區塊，確保了音質的升級。707 更透過巧妙的能量緩衝設計，支援設備輸出峰值功率的能力——其過載保護功能同時也確保了所有器材的安全。我們的測試將揭示這款電源淨化器及其儲能系統究竟能達到何種境界。

 

When it comes to sound tuning, the best place to start is at the beginning: with the power supply. The current coming out of the wall socket is often quite dirty and prevents connected audio components from delivering their full sonic potential. A power conditioner or mains filter allows source devices and amplifiers to reach their full potential. But this purification comes at a price – and it should be proportionate to the value of the audio system. For ambitious audiophiles who don't want to spend a fortune on sound improvement, AudioQuest has created the PowerQuest series: The power conditioners in this series are designed to offer the same fundamental filtering advantages as the more expensive power conditioners in AudioQuest's Niagara series, from which we've already had the Niagara 1200 and Niagara 3000 visit our lite editorial office. The PowerQuest series consists of five models. They possess various equipment and filter features, but all follow the basic AudioQuest approach of reducing so-called "noise" across a wide bandwidth during power cleaning – i.e., power anomalies that impair the performance of the devices and degrade the sound.

說到聲音調校，最好的起點就是源頭：電源供應。牆上插座傳送出來的電流通常相當污濁，阻礙了連接的音響組件發揮其全部的聲音潛力。電源處理器或電源濾波器能讓訊源設備和擴大機展現其全部實力。但這種淨化是有代價的——而且這筆花費應與音響系統的價值成正比。對於那些不想花費天價來改善音質、卻又充滿抱負的發燒友，AudioQuest 打造了 PowerQuest 系列：該系列的電源處理器旨在提供與 AudioQuest 更昂貴的 Niagara 系列（我們 lite 編輯部先前已評測過 Niagara 1200 與 Niagara 3000）相同的基本濾波優勢。PowerQuest 系列由五款型號組成。它們擁有各種設備與濾波特性，但都遵循 AudioQuest 的基本理念，即在電源淨化過程中，以寬廣的頻寬來減少所謂的「雜訊（noise）」——亦即那些會損害設備效能並使音質劣化的電源異常狀況。

 

 

應用於 HiFi 系統或擴音設備 Use in HiFi or sound reinforcement applications

 

Following the 505 , we now have the 707, the flagship of the PowerQuest series, in our hands – and it immediately demonstrates its premium status with its appearance: The sleek, understated slim design of the chassis is entirely made of metal and finished in matte black. The slight overhang of the solid, black anodized aluminum front panel enhances the high-quality look. Measuring 10 x 43 x 380 centimeters, its dimensions conform to standard hi-fi dimensions. However, it also fits into a 19-inch rack, making it suitable for PA applications. This powerhouse occupies two rack units. The necessary mounting brackets are included. For ease of use in hi-fi or sound reinforcement systems, the on/off switch is conveniently located on the front panel. It centrally controls all seven outlets. Therefore, all connected components are simultaneously switched on and off with a single press of the switch. This is not only convenient but also saves energy.

繼 505 之後，我們現在拿到了 PowerQuest 系列的旗艦機型 707——它的外觀立刻展現了其頂級地位：機箱時尚、低調且纖薄的設計完全由金屬製成，並採用霧黑表面處理。堅固的黑色陽極處理鋁合金前方面板略微突出，進一步提升了高品質的視覺感受。其尺寸為 10 x 43 x 38 公分，符合標準 Hi-Fi 器材的尺寸。不過，它也能裝入 19 吋的機架中，這使其同樣適用於 PA 擴音應用。這台強大的設備佔用兩個機架單位（2U），且隨附了必要的安裝支架。為了在 Hi-Fi 或擴音系統中方便使用，電源開關便利地設置在前方面板上。它集中控制著所有七個插座。因此，只需按一下開關，所有連接的組件就能同時開啟或關閉。這不僅方便，還能節省能源。

 

具備進階濾波與緩衝功能的旗艦機種 Flagship with filter and buffer plus

 

While the connection options on the smaller 303 and 505 models are integrated directly into the rear panel, they are presented as separately mounted grounded outlets on the 707. The distribution of functions, however, remains the same: Three outlets are designed for integrated amplifiers, active speakers, or active subwoofers – i.e., for power-intensive components with variable power requirements. For these, the 707 is the only model in the series to offer an extra energy buffer: This buffer provides the connected amplifiers with power support during short-term power peaks in highly dynamic music or action-packed movies. The four other outlets are optimized for CD players, streamers, or TVs – i.e., for source devices with low, constant power requirements. These outputs are filtered separately – and here, too, the 707 demonstrates its premium position: In the 303, power filtering is achieved solely through push-pull filtering, which AudioQuest calls "Linear Filtering." The 505 also incorporates common-mode filtering. AudioQuest calls this more effective combination "Ultra-Linear Filtering". In the 707, this ultra-linear noise reduction is now even more effective: its filter circuit operates with a wider bandwidth.

雖然較小的 303 和 505 型號的連接端子直接整合在背板上，但在 707 上，它們以獨立安裝的接地插座呈現。不過，功能分配依然相同：三個插座專為綜合擴大機、主動式喇叭或主動式超低音設計——也就是針對電力需求起伏較大的大耗電組件。對於這些器材，707 是全系列中唯一提供額外能量緩衝器的型號：這個緩衝器能在高動態音樂或充滿動作場面的電影出現短暫功率峰值時，為連接的擴大機提供電力支援。另外四個插座則專為 CD 播放機、串流播放機或電視優化——也就是針對電力需求較低且恆定的訊源設備。這些輸出經過獨立濾波處理——在這裡，707 同樣展現了它的頂級地位：在 303 中，電源濾波僅透過推挽式濾波實現，AudioQuest 稱之為「線性濾波（Linear Filtering）」。505 則進一步加入了共模濾波（common-mode filtering）。AudioQuest 將這種更有效的組合稱為「超線性濾波（Ultra-Linear Filtering）」。而在 707 身上，這種超線性雜訊抑制變得更加強大：其濾波電路的運作頻寬更為寬廣。

 

 

劣質電源是音質劣化的元兇 Poor electrical power as a sound degrader

 

But why do you even need a power conditioner? After all, all devices work just by plugging them into a wall socket with a simple power strip. That's true – but the power supplied this way is in a decidedly poor state. Its distortion is caused by, for example, neighboring industrial plants, but also by the electrical appliances in our own environment: washing machines and refrigerators, lamp dimmers, and charging or switching power supplies all feed interference into the grid, causing current spikes and voltage distortions known as differential-mode noise. In addition, there's common-mode noise: high-frequency radio frequency interference (RFI) affects the power cables of the devices, which are usually poorly shielded and act as antennas for electromagnetic radiation and radio interference. The RFI interference originates from external cell towers and the networked devices in our homes, such as Wi-Fi routers, mobile phones, and even the audio components themselves. Furthermore, they interfere with each other through their cable connections. These numerous disturbances cause noise, hissing and humming, they degrade the performance of the components and reduce sound quality, clarity and dynamics of the playback.

但為什麼你甚至會需要一台電源處理器？畢竟，所有設備只要用一條簡單的延長線插上牆壁插座就能運作。這是事實——但這樣供應的電源品質絕對是糟糕的。其失真原因不僅可能來自鄰近的工業廠房，也來自我們自身環境中的電器：洗衣機與冰箱、燈光調光器，以及充電器或交換式電源供應器都會將干擾回傳到電網中，引起電流突波和電壓失真，這被稱為差模雜訊（differential-mode noise）。此外，還有共模雜訊（common-mode noise）：高頻射頻干擾（RFI）會影響設備的電源線，這些電源線通常屏蔽不良，就如同接收電磁輻射和無線電干擾的天線一般。RFI 干擾源自外部的基地台以及我們家中的網路設備，例如 Wi-Fi 路由器、行動電話，甚至音響組件本身。更甚者，它們會透過線材連接相互干擾。這些繁多的干擾會產生噪音、嘶嘶聲和哼聲，它們會降低組件的效能，並削弱播放時的音質、清晰度與動態表現。

 

 

專為高效能擴大機設計的低阻抗 (Low-Z) 連接埠 Low-Z connectors for high-performance amplifiers

 

Power conditioners help combat this. They operate in various ways: The product range extends from active units that generate a completely new voltage to mains filters that clean the power supply using only a passive circuit. This is how the models in the PowerQuest series work, including the 707. First and foremost, it acts as a distribution point: With its power outlets, it provides seven components of an audio and/or AV system with a connection to the mains power supply. To prevent these devices from interfering with each other, the individual outlets of the 707 are not connected in series, but rather in a star configuration with its filter circuits. These outlets are also divided into two different sections. For wattage-intensive components with highly fluctuating power requirements, such as integrated amplifiers, power amplifiers, active loudspeakers, and active subwoofers, the focus is on immediate availability. In the filter circuit used here, the impedance and the associated phase delay must therefore be small to prevent current compression – the cause of anemic, thin, undifferentiated, sluggish amplifier sound. Because of the impedance minimization, these "high current" connections are also called "low-Z outlets".

電源處理器有助於對抗這些問題。它們以不同方式運作：產品範圍從產生全新電壓的主動式設備，到僅使用被動電路來淨化電源的電源濾波器皆有。包含 707 在內的 PowerQuest 系列型號皆是以此方式運作。首先也是最重要的一點，它扮演著分配中心的角色：透過其電源插座，它為音響和/或 AV 影音系統的七個組件提供連接至主電源的途徑。為了防止這些設備互相干擾，707 的個別插座並非串聯，而是以星狀拓撲（star configuration）連接至其濾波電路。這些插座也分為兩個不同的區塊。對於電力需求波動極大的大瓦數耗電組件，例如綜合擴大機、功率擴大機、主動式喇叭和主動式超低音，重點在於電流的即時供應。因此，在此處使用的濾波電路中，阻抗及其相關的相位延遲必須極小，以防止電流壓縮（current compression）——這是導致擴大機聲音變得貧弱、單薄、缺乏層次且遲滯的元兇。由於這種阻抗最小化的設計，這些「高電流（High Current）」連接埠也被稱為「低阻抗插座（low-Z outlets）」。

 

 

提供更大動力儲備的能量緩衝器 Energy buffer for greater power reserves

 

To ensure prompt availability, the 707, the only high-current amplifier in the entire PowerQuest series, now offers an exclusive feature for these high-current outlets: In addition to its filtering capability, the workings of which AudioQuest does not explain in detail, it also possesses an energy storage system called "Transient Power Correction." Thanks to this power buffer, the 707 can instantly supply all amplifiers connected to the "High Current" section with a current of up to 45 amps for a maximum duration of 25 milliseconds. This is achieved by an impressive cylindrical storage unit located inside the 707 behind the filter circuit board. This battery-like reservoir allows the power supplies of the connected amplifier components to absorb even severe, short-term power spikes. These spikes occur during highly dynamic music or during powerful movie soundtracks with booming bass. If a power supply bottleneck occurs during such demanding moments, this becomes noticeable in the sound through a loss of dynamics. Therefore, a powerful power supply is generally the foundation for a top-quality amplifier.

為了確保即時的電力供應，707 作為整個 PowerQuest 系列中唯一的高電流機種，現在為這些高電流插座提供了一項獨家功能：除了 AudioQuest 並未詳細說明的濾波能力之外，它還擁有一個名為「瞬態電源校正（Transient Power Correction）」的儲能系統。歸功於這個電源緩衝器，707 能夠為連接到「高電流」區塊的所有擴大機，瞬間提供高達 45 安培的電流，最長持續 25 毫秒。這是透過位於 707 內部、濾波電路板後方一個引人注目的圓柱形儲能單元來實現的。這個類似電池的儲備庫，讓連接的擴大機組件的電源供應器能夠吸收甚至是非常劇烈、短暫的功率峰值。這些峰值通常出現在高動態的音樂，或帶有震撼低頻的強勁電影配樂中。如果在這種嚴苛時刻發生供電瓶頸，聲音就會明顯出現動態流失的狀況。因此，強大的電源供應通常是一台頂級擴大機的基石。

 

 

專為訊源設備與前級擴大機設計的共模與差模濾波 

Common-mode and differential-mode filtering for source devices and preamplifiers

 

The other four outlets are strictly separate from this one. They have their own filter circuit designed for source devices and preamplifiers. Due to the consistently low and mostly constant power requirements, current compression is not the primary concern here. Instead, the focus is on the low input level of the sensitive music signal and its higher gain. Therefore, more effort is required to suppress noise in the supply current. This is where the previously mentioned ultralinear filter combination comes into play. Common-mode noise filtering takes care of the difficult-to-filter common-mode interference. It reduces noise in the frequency range from 30 kilohertz to 100 megahertz. According to the datasheet, the filtering effect should be more than 22 decibels. Differential-mode noise filtering then handles the differential-mode interference. Compared to its smaller sibling, it is designed with a significantly wider bandwidth: While the 505 operates in this filter mode between 30 kilohertz and 100 megahertz, the 707 starts filtering at eight kilohertz and thus covers a much larger frequency band. The filtering effect is also said to exceed 22 decibels.

另外四個插座與高電流區塊嚴格分離 ( 美規插座則為8個 ) 。它們擁有專為訊源設備與前級擴大機設計的獨立濾波電路。由於電力需求持續處於較低且大多恆定的狀態，這裡首要考量的並非電流壓縮問題；相反地，焦點在於敏感音樂訊號的低輸入電平及其較高的增益。因此，需要花費更多心力來抑制電源電流中的雜訊。這就是前面提到的超線性濾波組合發揮作用的地方。共模雜訊濾波（Common-mode noise filtering）負責處理難以濾除的共模干擾。它能降低 30 千赫茲（kHz）至 100 百萬赫茲（MHz）頻率範圍內的雜訊。根據規格表，其濾波效果應超過 22 分貝。接著，差模雜訊濾波（Differential-mode noise filtering）則負責處理差模干擾。與較小的型號相比，它的設計具有更寬廣的頻寬：505 在此濾波模式下於 30 kHz 至 100 MHz 之間運作，而 707 則從 8 kHz 就開始濾波，因此涵蓋了更廣闊的頻段。據稱其濾波效果同樣超過 22 分貝。

 

 

雙重突波與過載保護 Dual surge and overload protection

 

To prevent the PowerQuest 707 from having to clean a highly contaminated voltage caused by a low-quality, interference-prone cable, a high-quality power cord is included. This cord is designed for low noise and fast, low-loss power transmission. Beyond power purification, the 707 offers dual protection for all connected components: If the mains voltage exceeds 270 volts, the monitoring circuit's relay cuts off contact with all devices within a quarter of a second. As soon as the input current returns to normal, the connection is automatically restored. The 707 also protects all components from voltage and current spikes from the mains up to 6,000 volts and 3,000 amps – up to the household fuse rating. This overload protection is designed to be lossless and maintenance-free, meaning it is implemented without a fuse. The 707 is designed to withstand such overloads repeatedly and does so without the reset button found on its smaller siblings, the 303 and 505.

為了讓 PowerQuest 707 避免因劣質、容易受干擾的線材所造成的高度污染電壓，原廠隨附了一條高品質的電源線。這條線材專為低噪音和快速、低損耗的電力傳輸而設計。除了電源淨化之外，707 還為所有連接的組件提供雙重保護：如果市電電壓超過 270 伏特，監控電路的繼電器會在四分之一秒內切斷與所有設備的接觸。一旦輸入電流恢復正常，連接就會自動恢復。707 也能保護所有組件免受來自電網高達 6,000 伏特和 3,000 安培的電壓與電流突波傷害——最高可達家用保險絲的額定值。這種過載保護被設計為無損且免維護，這意味著它是在沒有保險絲的情況下實現的。707 旨在承受反覆出現的此類過載，而且不需要像其較小的兄弟機型 303 和 505 那樣依賴重置按鈕。

 

 

AudioQuest PowerQuest 707 實戰測試 The AudioQuest PowerQuest 707 in practice

 

So how does power purification and energy buffering actually pay off when playing music in the listening room? Initially, not at all – because we're leaving the PowerQuest 707 out of the equation and powering our audio chain as poorly as possible: From the wall socket, we're going into two of the cheapest triple power strips, which we've also daisy-chained. They're powering our Transrotor Dark Star turntable, our Oppo UDP-203 SACD player , the Lumin P1 mini streaming player , and our Cayin Jazz 90 integrated amplifier , which is driving a pair of Audio Physic Midex speakers. We're listening to "Seven Days Of Falling" by the Esbjörn Svensson Trio – and despite the sloppy power supply, the melodic jazz number with piano, bass, and drums admittedly doesn't sound too bad: The instruments are quite present, details are clearly audible, and the overall sound is quite well-rounded. But we already know: There's definitely more potential here.

那麼，在聆聽室播放音樂時，電源淨化和能量緩衝究竟是如何發揮作用的？起初，完全沒有作用——因為我們刻意把 PowerQuest 707 排除在外，並盡可能用最差的方式為我們的音響系統供電：從牆壁插座出來後，我們接上了兩個最便宜的三孔延長線，而且還是將它們串聯起來。它們為我們的 Transrotor Dark Star 黑膠唱盤、Oppo UDP-203 SACD 播放機、Lumin P1 mini 串流播放機以及推動一對 Audio Physic Midex 喇叭的 Cayin Jazz 90 綜合擴大機供電。我們聆聽著 Esbjörn Svensson Trio 的〈Seven Days Of Falling〉——儘管電源供應十分草率，這首包含鋼琴、貝斯和爵士鼓、旋律優美的爵士樂曲，老實說聽起來還不算太糟：樂器頗具存在感，細節清晰可聞，整體聲音也相當圓潤。但我們心知肚明：這裡絕對還有更多的潛力未被發掘。

 

深邃的寧靜，強悍的低頻 Deep silence, powerful bass

 

So we clear away the tangle of cables and wires and neatly connect all the components to the 707, with the Jazz 90 plugged into one of the three high-current outlets and all the other components into the source section connections. Now we start "Seven Days of Falling" again – and have an acoustic revelation. This begins even before bassist Dan Berglund opens the song, because the very subtle hiss that arises during vinyl playback due to scanning and preamplification is now even quieter. This allows Berglund's bass motif to shine through all the more: it consists of four notes with a short pause – and this interruption, precisely because of the now greater silence, has a significantly greater impact. But the bass itself also has a more assertive presence: its tone is more voluminous and powerful. We can now feel this surge physically, especially the low A-flat that Berglund plays in the sub-octave, which has fantastic resonance.

於是我們清除了糾結的線材，將所有組件整齊地連接到 707 上，Jazz 90 插在三個高電流插座之一，其他所有組件則連接到訊源區塊的插座上。現在我們重新播放〈Seven Days of Falling〉——並經歷了一場聽覺的啟示。這一切甚至在貝斯手 Dan Berglund 為歌曲開場之前就開始了，因為在黑膠播放過程中，由讀取和前級放大所產生的極微小嘶嘶聲現在變得更安靜了。這使得 Berglund 的貝斯主旋律更加耀眼：它由四個音符加上一個短暫的停頓組成——而這種中斷，正是因為現在更深邃的寧靜，產生了明顯更大的衝擊力。而貝斯本身的結像也變得更加堅實：其音色更加豐滿有力。我們現在可以從身體上感受到這種湧動，尤其是 Berglund 在次八度音域彈奏的低音降A，展現出極其美妙的共鳴。

 

更高的透明度與可聽性 Greater transparency and audibility

 

The next "aha" moment comes with the entrance of the piano: Esbjörn Svensson plays gentle chords, yet even his moderate pressing of the keys results in a clearer, more defined attack. Since the piano's entry coincides precisely with the bass's pause, these unexpected chords now unfold with greater impact. This is how the surprise, the compositional idea behind it, succeeds! Svensson plays these chords with a few additional notes; this addition makes the chords even more exciting – and now these notes are also much more audible because they are clearer, don't blur together, and don't overpower each other. The increased transparency and clarity make these sounds all the more fascinating: We now register more impressively how the different tones resonate through the piano's soundbox, how the many vibrations of the numerous buzzing strings overlap, sometimes reinforcing each other, sometimes thinning out – and thus a floating, shimmering, constantly changing overtone spectrum can be heard as the sound fades away.

下一個「令人頓悟」的時刻出現在鋼琴聲加入時：Esbjörn Svensson 彈奏著輕柔的和弦，然而即使他只是適度地按下琴鍵，也能產生更清晰、更明確的觸鍵感。由於鋼琴的切入點正好與貝斯的停頓重疊，這些出乎意料的和弦現在展現出更強大的衝擊力。這正是背後的作曲理念與驚喜得以成功的原因！Svensson 在彈奏這些和弦時加入了一些額外的音符；這些點綴讓和弦變得更加扣人心弦——而現在這些音符也變得更容易聽見，因為它們更加清晰、不會混雜在一起，也不會互相掩蓋。提升的透明度與清晰度讓這些聲音變得更加迷人：我們現在能更深刻地體會到，不同的音調是如何透過鋼琴的共鳴箱產生共鳴，眾多嗡嗡作響的琴弦所產生的無數振動是如何交疊，時而互相增強，時而變得稀薄——因此，隨著聲音的消散，我們能聽到一種漂浮、閃爍、不斷變化的泛音頻譜。

 

 

更好的精準度，增加的動態 Greater accuracy, increased dynamics

 

We no longer hear only the notes being played on the piano, but also perceive the steel of the strings, the metal of the vibration-transmitting cast iron frame, and the wood of the resonating soundboard – in short, the materials and the physicality of this instrument. Therefore, it now feels to us as if we are standing at the open lid of a real grand piano. The difference is equally striking with the drums: Magnus Öström's drumming is minimalist and serves the song; he plays subtly and quietly with brushes. Previously, this sounded like a somewhat diffuse rustling; now, however, we notice that metal bristles are brushing against the snare drum – and we also hear how Öström varies the volume, how the strokes are weighted, and how he gradually increases the intensity of his playing as the song progresses. We hadn't experienced this build-up so impressively before. Here, in addition to greater precision, a gain in dynamics is also noticeable.

我們不再只是聽到鋼琴演奏出的音符，還能感知到琴弦的鋼材、傳遞振動的鑄鐵框架的金屬感，以及共鳴響板的木質——簡而言之，就是這件樂器的材質與實體感。因此，現在我們感覺彷彿就站在一台真實的三角鋼琴敞開的琴蓋旁。這種差異在爵士鼓上同樣令人驚豔：Magnus Öström 的鼓技極簡且為歌曲服務；他使用鼓刷進行細膩且安靜的演奏。以前，這聽起來像是某種有些擴散的沙沙聲；然而現在，我們能注意到金屬刷毛正在摩擦小鼓——我們也聽見了 Öström 是如何改變音量、敲擊的力道如何分配，以及他如何隨著歌曲的推進逐漸增加演奏的強度。我們以前從未如此深刻地體驗過這種情緒堆疊。在這裡，除了更高的精準度之外，動態的提升也同樣顯而易見。

 

充滿衝擊力的爵士鼓組 Drum set with impact

 

Now we want to enjoy this with a dedicated drum solo: "Stick To Me" by Charly Antolini. We first power the electronics through our cheap power strips, then through the 707 – and the difference makes us grin: the power boost significantly adds punch and power to Antolini's playing – and a freshness: it sounds as if the master is having even more fun. Now the furious excursions across the drum kit have their full impact. The strokes have more oomph, the impact of the sticks on the heads now has just the right, hard attack. The snare cracks and pops so loudly that we flinch at the rolls. The bass drum has a rich thump, yet sounds drier and more defined. The greater dynamics, precision, and definition make the drum kit sound more three-dimensional, more real. Even the large recording space where Antolini plays is more intensely perceptible due to the now more audible reflections from the studio walls.

現在我們想透過一段專門的爵士鼓獨奏來享受這一點：Charly Antolini 的〈Stick To Me〉。我們首先透過廉價的延長線為電子設備供電，接著換成 707——這差異讓我們不禁微笑：電源的提升顯著地為 Antolini 的演奏增加了力道與爆發力，還帶來了一種鮮活感：聽起來就像這位大師玩得更開心了。現在，在整套爵士鼓上狂暴的游移展現了其十足的衝擊力。敲擊更具勁道，鼓棒落在鼓皮上的衝擊感現在擁有了恰到好處、紮實的瞬態反應。小鼓的劈啪聲如此響亮，以至於我們在碎鼓點時忍不住退縮了一下。大鼓有著豐滿的重擊聲，但聽起來卻更乾燥、輪廓更分明。更佳的動態、精準度與解析力讓爵士鼓組聽起來更加立體、更加真實。甚至連 Antolini 演奏時所在的廣闊錄音空間，也因為現在更清晰的錄音室牆壁反射聲，而變得更加強烈可感。

 

輝煌的管弦樂 Orchestral brilliance

 

The increased performance and energy output also pay off on a large orchestral scale: In the final Allegro of Gershwin's Piano Concerto, performed by world-class pianist Kirill Gerstein with the St. Louis Symphony Orchestra, the interplay between piano and orchestra has significantly more brilliance and dynamism. The orchestral tutti sections impress with genuine explosiveness, the driving staccatos of the strings are audible with wonderfully sharp bow strokes, the staccato notes of the wind instruments now truly resonate, and the thunderous timpani strokes send shivers down our spines. Wow! The orchestral musicians are now also better and more spaciously positioned, possessing a greater presence, right down to the delicate triangle of the percussionist. This makes the rapid changes of entry, the back-and-forth between the various instruments and sections, even more breathtaking and exhilarating. This fuels Gerstein, who also plays the piano part with tremendous percussive power. Nevertheless, we can hear every keystroke of his tonal attacks during his incredibly fast runs and jumps across the keyboard.

提升的效能與能量輸出在大編制的管弦樂中同樣得到了回報：在由世界級鋼琴家 Kirill Gerstein 與聖路易交響樂團合作演出的蓋希文《鋼琴協奏曲》最後的快板樂章中，鋼琴與管弦樂團的交錯呼應展現出明顯更加輝煌且充滿活力的面貌。管弦樂的齊奏樂段以真實的爆發力令人印象深刻，弦樂極具驅動力的斷奏可以聽見絕妙銳利的運弓，管樂器的斷奏音符現在真正產生了共鳴，而雷鳴般的定音鼓敲擊則讓我們背脊發涼。哇！管弦樂團的音樂家們現在的定位也更好、音場更寬廣，擁有更強烈的存在感，甚至連打擊樂手精緻的三角鐵也不例外。這使得各個樂器與聲部之間快速的切換切入、來回對答變得更加令人屏息與振奮。這點燃了 Gerstein 的熱情，他同樣以極大的打擊力度演奏著鋼琴聲部。儘管如此，在他以不可思議的速度跨越琴鍵進行音階跑動與跳躍時，我們依然能聽清他每一次觸鍵的音色起音。

 

更加親密且強烈 More intimate and intense

 

As paradoxical as it sounds, despite this increased speed, the overall sound is simultaneously calmer, smoother, more coherent, and more relaxed. We experience all of this with our final track: "Kanskje" by Kari Bremnes. The synthesizer-rich, atmospheric piece only unfolds its full epic tranquility after the 707's power boost. This is also due to the bass: Whereas the rapidly successive, repetitive staccato bass notes, which run through the entire song like Morse code, previously sounded somewhat restless and unsteady, the now more substantial, powerful, and contoured bass sequences form a stoic, unshakeable foundation. Above this, various layers of sound now float with even greater clarity, freedom, and spaciousness. Kari Bremnes is now perfectly embedded within this: Her sonorous, pleasantly dark-timbred voice now sounds significantly more intimate and intense. The excellent reverb, which enhances her vocals, is now even more powerful, making Bremne's narration all the more impressive. The singer thus has an even greater presence – and completely captivates us.

儘管聽起來很矛盾，但在這種速度提升的同時，整體聲音卻變得更平靜、更流暢、更具連貫性且更放鬆。我們在最後一首曲目：Kari Bremnes 的〈Kanskje〉中體驗到了這一切。這首充滿合成器音效、極具氛圍感的作品，只有在 707 的電源加持後，才真正展現出其史詩般的寧靜感。這也歸功於低頻的表現：以前，那如同摩斯密碼般貫穿全曲、快速連續且重複的斷奏低音音符，聽起來有些焦躁不穩；而現在，更紮實、更有力且輪廓更分明的低音序列形成了一個堅忍、不可動搖的基石。在此之上，各種聲音層次現在以更高的清晰度、自由度與空間感漂浮著。Kari Bremnes 現在完美地融入其中：她那響亮、帶著迷人暗色調嗓音，現在聽起來顯著更加親密且強烈。用來增添她聲線魅力的出色殘響現在更具威力，讓 Bremnes 的述說更加動人。歌手因此擁有了更強大的存在感——並徹底擄獲了我們。

 

 

結論 Conclusion

 

The AudioQuest PowerQuest 707 shines as an effective power conditioner. It provides clean power to seven components with separate and differently configured filtering for four source devices and three amplifiers. The 707 even has its own dedicated power buffer to absorb short-term power spikes. This power optimization benefits performance across the board: noise and interference are reduced. The music sounds clearer, cleaner, and more transparent. Resolution, and therefore detail, is enhanced. Musicians and instruments have greater presence and presence, and voices sound more intimate and intense. The soundstage gains spaciousness and openness. Playback is more accurate, coherent, and relaxed – and thanks to significantly increased dynamics, it's also fresher, more attack-rich, more explosive, and more powerful, right down to the significantly more voluminous bass. Beyond this substantial improvement in sound quality, the 707 now also offers overvoltage and overload protection for all connected devices. Excellent!

AudioQuest PowerQuest 707 作為一款高效的電源處理器表現出色。它能為七台組件提供乾淨的電源，並為四台訊源設備與三台擴大機配備了獨立且配置不同的濾波功能。707 甚至擁有專屬的電源緩衝器來吸收短暫的功率峰值。這種電源優化全面提升了整體效能：雜訊與干擾減少了。音樂聽起來更清晰、更乾淨、也更透明。解析度以及隨之而來的細節表現都得到了強化。音樂家與樂器擁有更大的臨場感與存在感，人聲聽起來也更加親密且強烈。音場獲得了更寬廣的空間感與開闊度。音樂的重播更加精準、連貫且放鬆——歸功於大幅提升的動態表現，它也變得更加鮮活、更具衝擊力、更具爆發力且更加強悍，甚至連低頻也變得明顯更加豐滿。除了音質上的實質提升之外，707 現在還為所有連接的設備提供了過壓與過載保護。太出色了！