Resonessence Labs是近來非常火紅的牌子，臺灣也終於有代理引進，其主要設計者都是DAC與ADC的專家，是ESS的中心人物，也難怪第一個推出的Invicta就能引起注目。這次試聽的正是Invicta，就由一樣火紅的Brown熊大揭開序幕吧
彩色的說明書，官網也能下載。
體積不大，中間為顯示螢幕，左方有兩個耳機輸出，右方為取樣頻率顯示，控制按紐，左方的DXD與DSD宣告了最高的規格解碼能力。特別的是可以看到有一個記憶卡插槽，Invicta可以直接解碼記憶卡中的音樂檔案。
背後的端子非常齊全，包括平衡類比輸出，各式數位輸入，SYNC應該是時鐘接口，還有一個HDMI可以接到螢幕顯示…對於要使用大螢幕控制顯示的數位玩家很是方便。
更精彩的當然就是要看看內在美了。
先來一張內部全圖，超級有料。
小而豐滿的內在真是讓人興奮。遠遠就看到那個ESS晶片，這麼小的體積，以DAC來說，這顆環型變壓器超出誠意了，內部各個部份都有隔離區分，井然有序。仔細看，ESS那個解碼中心有下上兩層線路喔，Invicta共使用了兩顆32 Bits ESS Sabre晶片。
原廠56頁的技術說明: http://resonessencelabs.com/wp-content/uploads/2012/05/InvictaMeasNotes.pdf
接上後發現不知道怎麼開機，原來盒子內下方還有一層，有擺了遙控器與配件。
驚！使用的是Apple Remote，跟之前的Alluxity一樣。
待機左方的Logo是紅色的，開機後就會變成藍色。
Incivta的解碼輸入有很多種，我是先用USB。
Invicta有一個非常特別的功能，就是前方有個SD的記憶卡插槽，可直接讀取SD卡裡的音樂檔案，一樣可支援到DSD 5.6MHz與DXD。因此今天主要就是測試這個部份，把要聽的音樂檔先拷貝到SD卡中。
特地挑了DSD 5.6, DSD 2.8, RR 176.4(WAV與AIFF), 還有MP3。
輸入要切換到SD Card Audio。
直接就可看到各個子目錄。
DSD 5.6，第2排的燈就會亮起。
DXD, 352.8kHz。
DSD 2.8，第一排燈亮起，右下也會顯示DSD。
WAV與AIFF都可，但MP3，很抱歉，太Low End，沒支援！另外也試聽了耳擴的部份，共有兩組，尚未看這兩組有無不同。先接再第一組，兩組都有單獨的開關，不用可以關上，藍燈是指示燈。推Sennheiser的HD 800，沒想到效果相當好，推力足夠，各頻段包括音場都有推開，很是厲害，若要吹毛求疵，就是低頻的量少了一點點。
Invicta的功能實在非常強大，越是接觸把玩，越是覺得他的厲害，就像這個數位音控，居然最低可以到-127.5dB。
這是以另外一台CD為轉盤，利用Invicta的SPDIF(BNC)進行解碼試聽。由於手邊沒有BNC的數位線，用了一個RCA/BNC轉接頭。
Invicta內部的數位濾波高達7種，是我目前試聽過最多種的 (當然有其他DAC可能有更多種)。用家可玩性非常高，其實Invicta的設定蠻多的，但都很直覺與方便，且都是具有意義與功能性的。
Up-sampling Filters in the INVICTA rev 3.0 Software
• The internal Fast Roll-off filter pre-installed in the Sabre DAC.
On the OLED display panel this appears as “Sabre Fast Roll-Off” This is a ‘classic’ FIR filter with symmetrical coefficients, hence it is linear phase and nondispersive.
It achieves excellent suppression of -115db, and so has to have a relatively large group delay of 35 samples. That means, that for a CD at 44.1Khz the group delay is about 800uS. (less for higher sample rates). This filter exhibits pre-ringing, but achieves perfection in rejection: no sample rate artifacts above 22.05Khz are present in the output.
• The internal Slow Roll-off filter pre-installed in the Sabre DAC.
On the OLED display panel this appears as “Sabre Slow Roll-Off” This filter is designed to reduce the group delay present in the Fast Roll-off filter. It is a symmetrical impulse response (i.e. it has symmetrical coefficients), it is linear phase and non-dispersive. It achieves good rejection but the rejection begins slowly, 24Khz or so is
present in the output if the music content has signals near 20khz, but signals higher than that are suppressed. The group delay however is much less, being only 6.25 samples or 140uS at 44.1Khz. This filter also exhibits pre-ringing.
• Resonessence designed, Minimum Phase, IIR Filter
On the OLED display panel this appears as “Minimum Phase IIR” This filter is designed from an analog filter prototype and exhibits no pre-ringing at all. To achieve this, it has to compromise the steepness of the filter; it corresponds to a fourth order analog filter. This is a dispersive non-linear phase filter, but the dispersion has been optimized to the absolute minimum consistent with no pre-ringing.
• Resonessence designed, Minimum Phase Slow Roll-off.
On the OLED display panel this appears as “Minimum Phase Slow Roll-Off” This is a FIR filter that exceeds the specification of the above IIR filter achieving -100db stop band. It is not a linear phase filter because it has non-symmetric coefficients but has been designed to exhibit virtually no pre-ringing (but it does have some) with the minimum of dispersion.
• Resonessence designed, Linear Phase Apodizing Filter.
On the OLED display panel this appears as “Linear Phase Apodizing” Perfectly symmetrical impulse response, hence linear phase and non-dispersive, this filter achieves a high -96db rejection at fs/2 and exhibits the minimum of pre-ringing possible while achieving this excellent rejection. This is the preferred filter of many of our beta-testers.
• Resonessence designed, Linear Phase Fast Roll-off
On the OLED display panel this appears as “Linear Phase Fast Roll-Off” The ultimate FIR filter in the ‘classic’ linear phase category. This filter delivers ultra-high suppression of -120db and extreme flatness in the band. It exceeds the performance of the Sabre DAC pre-installed Fast Roll-off filter.
• Resonessence designed, Linear Phase Slow Roll-off
On the OLED display panel this appears as “Linear Phase Slow Roll-Off” Designed as an enhanced version of the preinstalled Sabre DAC Slow-roll off filter, this is a
linear phase, hence non-dispersive, low group delay filter that has less ripple in band and higher rejection that the Sabre Slow Roll-off filter
全文報導 (MY-HIEND電子雜誌第9期)
