USB звуковая карта ESI/Audiotrak Dr. DAC nano

       

USB звуковая карта ESI/Audiotrak Dr. DAC nano Dr. DAC nano представляет собой внешнюю компактную звуковую карту, с комбинированным выходом, аналоговым и цифровым. Новый nano отличает от подобных внешних звуковых карт поддержка 96 кГц и 24 бит, как для цифрового, так и аналогового тракта вместе с очень скромными габаритами.

Внешний вид ESI/Audiotrak Dr. DAC nano
Внешний вид ESI/Audiotrak Dr. DAC nano

Внешний вид

Фронтальный вид компактной звуковой карты ESI/Audiotrak Dr. DAC nano
Фронтальный вид ESI/Audiotrak Dr. DAC nano

На фронтальной панели расположен комбинированный выход под разъем джек 3.5 мм. Через специальный переходник подключается оптический кабель.

Тыловой вид звуковой карты ESI/Audiotrak Dr. DAC nano
Тыловой вид ESI/Audiotrak Dr. DAC nano

С тыловой стороны находится только USB разъем.

 

ESI/Audiotrak Dr. DAC nano, ESI/Audiotrak Dr. DAC prime и наушники Beyerdynamic DT 770 PRO
ESI/Audiotrak Dr. DAC nano, ESI/Audiotrak Dr. DAC prime, Beyerdynamic DT 770 PRO

На фотографии можно видеть, насколько устройство миниатюрно.

Комплектация

Комплектация звуковой карты ESI/Audiotrak Dr. DAC nano
Комплектация ESI/Audiotrak Dr. DAC nano

В коробке кроме самого Dr. DAC nano находятся USB кабель и листовка-мануал.

Комплектный usb кабель ESI/Audiotrak Dr. DAC nano
Комплектный usb кабель ESI/Audiotrak Dr. DAC nano

Особо хочется отметить USB кабель с двумя ферритовыми кольцами. Обычно в лучшем случае встречается лишь одно кольцо. Благодаря такому кабелю, можно не беспокоится о стабильности работы даже со слабыми USB портами.

Используемые компоненты и технологии

Контроллер Tenor TE7022L в ESI/Audiotrak Dr. DAC nano
Контроллер Tenor TE7022L

Связь с USB реализована через контроллер Tenor TE7022L. Такой же используется в Dr.DAC prime.

Паспортные характеристики Tenor TE7022L:

  • высокоскоростной (12MHz) USB контроллер потокового воспроизведения аудио
  • Полная поддержка USB 2.0 & USB Audio Class 1.0
  • Разрешение до 24 бит и опорной частоты до 96 кГц
  • Поддержка S/PDIF TX и RX, AES/EBU

 

PCM1796 (справа) и LME49860NA в ESI/Audiotrak Dr. DAC nano
PCM1796 (справа) и LME49860NA

В качестве ЦАП используется преобразователь AK4421.

Паспортные характеристики AK4421:

  • КГИ+Шум: -90 дБ (0.003 %)
  • Динамический разбег, Сигнал/шум: 103 дБ

Dr. DAC nano внутри состоит из одной платы.

 

Dr. DAC nano внутри состоит из одной платы

 

Dr. DAC nano внутри

 

Удобство от использования

Настройка громкости Dr. DAC nano

Dr. DAC nano не требует специальных драйверов, устанавливается автоматически. Это очень удобно. В системе устройство обозначается как "Dr. DAC nano", что внятно и понятно в отличии от различных других USB ЦАП-ов с безликим названием "USB audio DAC". По умолчанию после установки выставляется 50% громкости ( -29 дБ).

Работа драйвера

Диагностика RMAA

Device: Dr. DAC nano (usbaudio.sys)

Features:
Device has not enough hardware 2D buffers
Device has not enough hardware 3D buffers
EAX 1.0: N/A
EAX 2.0: N/A
EAX 3.0: N/A
EAX 4.0: N/A
EAX 5.0: N/A

Rates:
dwMinSecondarySampleRate 100
dwMaxSecondarySampleRate 200000

Free buffers stats:
dwFreeHw3DAllBuffers 0
dwFreeHw3DStaticBuffers 0
dwFreeHw3DStreamingBuffers 0
dwFreeHwMixingAllBuffers 0
dwFreeHwMixingStaticBuffers 0
dwFreeHwMixingStreamingBuffers 0

Max buffers stats:
dwMaxHwMixingAllBuffers 0
dwMaxHwMixingStaticBuffers 0
dwMaxHwMixingStreamingBuffers 0
dwMaxHw3DAllBuffers 0
dwMaxHw3DStaticBuffers 0
dwMaxHw3DStreamingBuffers 0

Misc stats:
dwFreeHwMemBytes 0
dwTotalHwMemBytes 0
dwMaxContigFreeHwMemBytes 0
dwUnlockTransferRateHwBuffers 0
dwPlayCpuOverheadSwBuffers 0

Поддержки игр нет. Вероятность отсутствия звука в играх маловероятна. В основном поддержка звука означает использование своих алгоритмов обработки звука, при условии, что игра дает такую опцию. Игроманам стоит обратить внимание в первую очередь на внутренние звуковые карты PCI/PCI-e.

Для профессиональных задач устройство не имеет поддержки ASIO, из-за чего воспроизведение и запись звука происходит с большей задержкой. Это важно лишь при игре вживую на инструментах. При работе в Ableton Live под MME интерфейсом  проблем не было.

Объективные измерения

ESI/Audiotrak Dr.DAC nano >> E-MU 1616m PCI

Для измерений ESI/Audiotrak Dr.DAC nano задействовался профессиональный интерфейс E-MU 1616m PCI, обладающий высокими техническими характеристиками. Динамический диапазон, сигнал/шум в собственном loop составляет 118 дБ.

АЧХ ESI/Audiotrak Dr.DAC nano

ESI/Audiotrak Dr. DAC nano - E-MU 1616m PCI
Частотная характеристика - 96 кГц / 24 бит
От 20 Гц до 20 кГц, дБ -1.80, +2.05
От 40 Гц до 15 кГц, дБ -1.41, +2.05

На АЧХ устройства можно наблюдать небольшой подъем в районе низких частот, до 3 дБ. Формально, для устройства работающего далее со стационарной техники это чаще минус, но для использования с портативной техникой, подъем на низких частотах наоборот может оказаться полезным. В любом случае, убавить низкие частоты программным способом можно без проблем, нежели чем их поднять. Как показывает практика, повышенный уровень низких частот достаточно актуален для портативного использования.

Уровни шумов в режимах 24 бит для звуковой карты ESI Dr. DAC nano
уровни шумов в режимах 24 бит для ESI Dr. DAC nano

ESI/Audiotrak Dr. DAC nano - E-MU 1616m PCI
 
Левый Правый
Мощность RMS, дБ -101.0 -100.9
Мощность RMS, дБ (A) -102.5 -102.3
Пиковый уровень, дБ -71.0 -71.6
Смещение DC, % -0.0 -0.0

Уровень шума получился близким к паспортному, это значит, что потенциал конвертера реализован максимально полностью. Спектр полностью чистый.

Гармонические искажения + шум (-3 дБ) для звуковой карты ESI/Audiotrak Dr. DAC nano
Гармонические искажения + шум (-3 дБ) ESI/Audiotrak Dr. DAC nano

Уровень гармонических искажений для применяемого ЦАП несколько высок, 0.056% против паспортных 0,003%. Однако при понижении сигнала искажения уменьшаются. Исходя из полученных данных, можно порекомендовать прослушивание не на максимальной громкости. В спектре теста интермодуляционных искажений так же видны именно гармонические искажения. Цифровое значение интермодуляционных искажений не имеет в данном случае смысла, т.к. в расчет попадают гармоники, кратные низкочастотному тону и их доля только самых крупных гармоник низшего порядка составляет 0,15% от 0,2%. Числовой параметр так же хуже выглядит и из-за неровной АЧХ, подъем на низких частотах так же делает числовое значение менее привлекательным. Если проводить тест с меньшим уровнем, то почти все искажения уменьшаются и близки к норме.

Хочется отдельно отметить, помимо цифр, показывающих уровень искажений, нужно учитывать и характер искажений, насколько он психоакустически заметен. В данном случае видно нелинейность, характерную для перегрузки. Важно, что именно такой характер искажений характерен для акустических систем и может быть замаскирован. У акустических систем и наушников такой уровень искажений изначально выше. Гораздо большую опасность представляют искажения другого характера, которые не будут маскироваться дальнейшим трактом.

Выход на наушники

Графики напряжения/мощности снимались при выходном уровне - 3 дБ. Это необходимое условие, если ЦАП не обладает сверхнизкими искажениями. Из-за этого графики выходного напряжения и мощности получаются несколько ниже, чем могли бы быть, если бы сигнал подавался под 0 дБ.

График уровня выходного напряжения на 1 кГц без искажений ESI/Audiotrak Dr. DAC nano
График уровня выходного напряжения на 1 кГц без искажений ESI/Audiotrak Dr. DAC nano

График уровня выходной мощности на 1 кГц без искажений ESI/Audiotrak Dr. DAC nano
График уровня выходной мощности на 1 кГц без искажений ESI/Audiotrak Dr. DAC nano

Результаты тестов
резистивная нагрузка, Ом выходной уровень напряжения, В Выходной уровень мощности, мВт
16 0,2 2,5
24 0,3 3,7
30 0,4 5,3
47 0,5 5,3
100 0,7 4,9
198 0,9 4
236 0,9 2,7
302 0,9 1,7
615 0,9 1,3
1096 0,9 0,7

Под всеми нагрузками спектр не меняется, что дает сделать вывод, что искажения усилителя для наушников ниже искажений ЦАП. Уровень выходной мощности невысок, сопоставим с мобильными устройствами.

Цифровой выход

Цифровой выход обеспечивает корректный вывод данных в режимах 44.1, 48 и 96 кГц.

ESI/Audiotrak Dr. DAC nano - E-MU 1616m PCI (SPDIF) 44.1/24 48/24 96/24
Неравномерность АЧХ (в диапазоне 40 Гц - 15 кГц), дБ +0.00, -0.00 +0.00, -0.00 +0.00, -0.00
Уровень шума, дБ (А) -143.0 -143.4 -146.4
Динамические диапазон, дБ (А) 132.8 133.0 133.1
Гармонические искажения, % 0.0000 0.0000 0.0000
Интермодуляционные искажения + шум, % 0.0002 0.0002 0.0002
Взаимопроникновение каналов, дБ -143.1 -144.0 -143.9
Интермодуляции на 10 кГц, % 0.0000 0.0000 0.0000

Выводы

Результаты тестов показывают, что подъем в области низких частот сделан в аналоговой части тракта, т.к. в цифровой АЧХ не имеет отклонений. Заметный уровень искажений как таковой проявляется лишь на максимальной громкости.

Следует понимать, что технические характеристики лишь косвенно дают понять о возможном субъективном качестве звучания. Так же у каждого участка тракта заведомо известны различные типы искажений, которые могут указать на неверный режим работы. Применительно к техническим характеристикам высококачественных устройств, характеристики должны укладываться в определенные значения. Поэтому выбор только по техническим параметрам без субъективного прослушивания не имеет смысла. Технические параметры дают возможность лишь оценить потенциал устройства.

Звучание - субъективные впечатления

Наушники

Выбор наушников для теста - это довольно популярные узнаваемые модели с разным уровнем чувствительности и сопротивления. Для Dr. DAC nano использовались:

  • Sennheiser HD 650 - аудиофильские наушники, которые можно считать стандартно классическими.
  • Fostex T50-RP - изодинамические наушники довольно требовательные к усилителю за счет низкой чувствительности.
  • AKG 272 Studio - студийные наушники с нейтральным звучанием, низкий импеданс, средняя чувствительность.
  • C.E.C. 53HP - наушники с низким уровнем импеданса и высокой чувствительностью.
  • Beyerdynamic DT 770 PRO - известные наушники с подчеркнутыми низкими частотами и высокими.
  • Sennheiser PX 100 - портативные открытые наушники со сбалансированным звучанием.
  • Sennheiser HD 228 - портативные закрытые наушники с подчеркнутыми низкими частотами.
  • Fischer Audio Silver Bullet - вставные наушники, топ модель Fischer Audio 2009 года.
  • Fischer Audio Eterna - вставные наушники с подчеркнутыми низкими частотами.

Усилитель для наушников дает достаточный уровень запаса по громкости для наушников с высокой чувствительностью. Недостаточный запас по громкости можно ощутить лишь с Fostex T50-RP, Sennheiser HD 228.

Для оценки влияния подъема на низких частотах был проведен эксперимент, через аппаратный фильтр E-MU 1-Band Shelf EQ избыток низких частот подавлялся. В итоге, можно было мгновенно переключать режимы с ровной АЧХ на выходе и оригинальной.

Аппаратный фильтр E-MU 1-Band Shelf EQ

оценка влияния подъема на низких частотах Dr. DAC nano

В отличии от акустических систем, наушники сильнее различаются по отдаче на низких частотах и подъем в 3 дБ не столь кардинально заметен, и если оценивать качество звучания "звуковая карта + наушники", то можно сказать, что подъем на низких частотах положителен для Bullet, и излишен для Beyerdynamic DT 770 PRO, Sennheiser HD 228, Fischer Audio Eterna. Для AKG 272 Studio, Fostex T50-RP, C.E.C. 53HP различие не так критично.

В целом, качество звучания хорошее, ухудшение заметно лишь на максимальном уровне выхода, поэтому лучше использовать лишь с высокочувствительными моделями наушников. При соединении с внешним усилителем достаточно ослабить сигнал примерно на 30%.

Выводы

Dr.DAC nano не требует драйверов и внешнего питания, и является очень удобным в использовании. Цифровой выход работает максимально корректно. На аналоговом выходе есть небольшой подъем низких частот. Максимальное качество для аналогового выхода получается на несколько пониженной громкости. Устройство хорошо работает с наушниками средней и высокой чувствительности, а для низкочувствительных наушников рекомендуется внешний отдельный усилитель. Благодаря миниатюрности хорошо подойдет к ноутбуку.


Автор: (expert) Роман Кузнецов
26.01.2010


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And the men who are prepared towards shift for it inside of the trend that he does, that Jarran Reed  does, and some of the adult men who rather occur out particularly traveling towards establish who they are.  It's major.  Rule range just one inside of the software is generally go over the staff members.  Hence we incorporate toward exhibit them how towards gauge their commitment and their hobby and their durability within a direction that will aid us, and consequently, it a finding out treatment for certain, and we additionally studying in excess of the avid gamers. That portion it, there's a good deal likely upon. [preseason game titles] It a substantial component of the unique workers assessment, what on your own can't do inside prepare? Yeah, this is in which males Pretty can bounce out. By yourself understand, can the linebackers demonstrate up, can they crank out a function at manufacturing the roster.  And the DBs can they produce a assertion that they belong?  On your own notice, hence a great number of males about the yrs Shead and Kearse, all those males that created their course through what they did preseason inside of exceptional workers circumstances.  Hence it out there for them. They likely in the direction of receive an likelihood. With any luck , they appear in the course of. Brandon Browner  tailored? He executing properly. He however functioning at it. There continue to nuances and variables he gotta obtain delicate with. He can do nearly anything. He participate in the operate, he can obtain inside the passing activity, he can participate in wonderful insurance each time we lock him up.  There a great deal of things with formations, fundamentals and aspects such as that, that he particularly requirements encounter thus he can deliver the specifically possibilities and selections and all.  Yet he carrying out effectively at developing Good improvements. His mindset been best. He Pretty seriously absent for it, and he been a whole lot of enjoyable in direction of incorporate out below. Oneself realize, I do comprehend that, yet I would believe hence, however we transform over attractive effortless up coming 7 days, as a result we consist of in the direction of look at. It actually be vital how he is upon Tuesday, how he accomplishing. Brandin Bryant  appears to be like which includes he getting to be reasonably a couple associates inside prepare. What contain yourself noticed in opposition to him?  He been an intriguing participant. He gonna purchase a Great appear, and he is made up of seemed amazingly very good within just coach. He incorporates a large amount in the direction of find out. He tends to make a great deal of issues mainly because he continue to mastering, still he manufacturing them coming at on your own and attacking, and that what outlined up. We require in direction of view how disciplined he be inside of the video game, if he do the directly point and all that. He incorporates performed tough while. Video clip Backlink
Smith Alex 17.12.2016 06:10:21 An intriguing dynamic unfolded throughout the thirty day period of December, as the 2015 regular monthly period was winding down Antwaun Woods Jersey. Creating the rounds of other NFL groups' SB Country internet websites, we learned that greatest of them ended up substantially additional positive pertaining to the offseason than Dolphin supporters had been. Even inside of destinations together with Buffalo and Cleveland, who consist of likely experienced it even worse than Miami consists of above the outside of 10 or 15 yrs, supporters have been fired up around the draft, and practically unanimous within their believe in that they would be far better off throwing away their becoming video games than transferring upon a tear in just the last months of the time, including a pair even further wins towards their amount of money, however nevertheless shed the playoffs, and primarily sabotaging their draft stage.  Then, we appear in the direction of Miami. Countless of us incorporate argued vehemently inside of present-day months that draft placement doesn't issue, that oneself comprise approximately as Wonderful a chance of deciding on a Specialist Bowl participant inside the instant or 3rd spherical http://www.titansteamfanshop.com/37-Titans_Bruce_Matthews_Jersey, or later on, as your self do inside spherical just one. In direction of aid that argument, we've trotted out names this kind of as Tom Brady and Dion Jordan. Just after all, if Brady, a lock toward generate the Corridor of Fame at the time he retires, was decided on within just the 6th spherical although Jordan went in close proximity to the unbelievably greatest of spherical a person, perfectly, then that attractive a great deal proves the total science powering the draft is purely natural snake oil http://www.titansteamfanshop.com/96-Titans_Reece_Horn_Jersey, directly?  No. What people 2 avid gamers stand for are exceptions, and a person of the uncomplicated, essential problems of the human head is that we are definitely obsessed with exceptions -- thus considerably as a result that we're further than knowledgeable of arguing that the exception, at some simple fact, results in being excess crucial than the rule versus which it is excepted. Previous Oakland Raiders QB Jamarcus Russell, the rather initially participant preferred inside of 2007, is likely the poster boy or girl for undesirable alternatives produced at the supreme of the draft, nonetheless does that imply the Tennessee Titans, who maintain the final choose within this yr's draft, really should exchange the initial choose for the 15th? Or 20th? Of system not.  A review completed above an 8 yr interval, against 2000 - 2007 discovered that the possibilities of picking a Expert Bowl participant within just the very first spherical, in excess of that season period of time, at minimum,  the possibilities of deciding upon a Professional Bowl participant were being 0.75 out of a 32 participant spherical, significantly less than 1/32nd.  Nevertheless . . . that doesn't conclusively verify that the initially, or moment, or 8th decide on within just the very first spherical is any much better than the 15th, 20th, or 20-5th, does it? Quite possibly not, nevertheless it would seem to be in direction of crank out it charming crystal clear -- no matter if we require in the direction of confess it or not.  There are a great deal of good reasons why the Dolphins haven't developed the playoffs for the reason that 2008 and haven't received a playoff recreation considering the fact that the 2000 period http://www.titansteamfanshop.com/69-Titans_Jalston_Fowler_Jersey, still it would feel that we're simply as selective at evaluating the factors for our workers's reduction as we are concerning the draft.  Classic knowledge suggests the Dolphins contain experienced 7 consecutive wasting seasons due to the fact they haven't experienced optimistic quarterback enjoy, and there can be small question that is made up of performed a position. Nonetheless on your own comprehend what else is made up of performed a position? That except if the Dolphins choose in the direction of spend market place worth for DE Olivier Vernon this offseason, Miami will not comprise drafted an affect participant upon security who intended it in direction of a instant deal with the staff because Reshad Jones was chosen back again within 2010. The Dolphins include picked a defensive participant within just the initial spherical merely a few periods above the beyond 11 seasons, less than any other NFL staff.  Inside of total, we can argue that the draft is an inexact science, that a employees is much better off attempting towards collect as quite a few alternatives as potential consequently that some of the concealed gems will with any luck , offset the inescapable busts. My good friend Sutton astutely pointed this out a handful of times back. All of this is suitable, yet thus far too is the a single level which, no make any difference how vigorously we argue in the direction of the opposite, is totally outside of discussion: that regardless of whether on your own draft a participant with the initial select or exchange down in direction of create extra selections, a large draft select is inherently even further worthwhile than a lessen draft pick out. Toward argue in a different way is tantamount in direction of arguing that the solar rises inside the West and sets within just the East, or that because my aunt Mabel the moment bought a 20 greenback offer of steaks for 5 money, that a 5 greenback monthly bill is extremely accurately as worthwhile as a 20 greenback monthly bill.  The Dolphins' dilemma with the NFL draft isn't with the draft alone, still as a substitute Sam Carlson Jersey, in just how the employees consists of mismanaged it yr once calendar year. If they can track down a route towards draft improved gamers, and in direction of draft avid gamers for the two aspects of the ball really than exactly a person aspect http://www.titansteamfanshop.com/51-Titans_David_Bass_Jersey, there is no explanation why they can't return in direction of the playoffs as before long as future time.    This is a FanPost and does not always replicate the opinions of The Phinsiders writers or editors. It does mirror the thoughts of this specific admirer despite the fact that, which is as vital as the opinions of The Phinsider writers or editors.
Smith Alex 17.12.2016 06:08:56 Ole Gray Beard is returning in direction of Contemporary Orleans.  Even despite the fact that deal info incorporate not been produced, the Saints  are bringing again Protection Roman Harper , who performed his final 2 a long time as a member of the Carolina Panthers . As a member of the Fresh new Orleans Saints towards 2006 towards 2012, Harper seemed inside 2 Skilled Bowls    With Jahri Evans and Marques Colston  unveiled this offseason, Roman Harper already produces 4 (upon ultimate of Drew Brees , Thomas Morstead  [url=http://www.saintsedgeshop.com/82-Saints_Thomas_Morstead_Jersey]http://www.saintsedgeshop.com/82-Saints_Thomas_Morstead_Jersey[/url], and Zach Strief ) latest roster contributors of the 2009 Tremendous Bowl  Winner workers.  Whilst plenty of Saints lovers criticized Harper throughout the stop of his initially tenure within NOLA as a bodily Protection who might simply perform up inside of the box with stone-palms who couldn't capture an Interception if the move was designed for him [url=http://www.saintsedgeshop.com/42-Saints_Garrett_Grayson_Jersey]Garrett Grayson Jersey[/url], he completed his initially 12 months within just Carolina with a vocation-large 4 alternatives. With no alternatives past year, he continue to accomplished the yr with 46 tackles [url=http://www.saintsedgeshop.com/14-Saints_Archie_Manning_Jersey]Archie Manning Jersey[/url].  Hence - what's your viewpoint upon the signing? Do yourself which include it? Do on your own despise it? Indifferent? Vote in just the poll. Demonstrate in just the responses. Mail me offers.     Poll    Are yourself satisfied with the Roman Harper signing?      at minimal his veteran management will guidance lead this younger protection in the direction of a successful character.  he was rubbish anytime he still left, and at this time hes accurately more mature rubbish [url=http://www.saintsedgeshop.com/63-Saints_Mark_Ingram_Jersey]http://www.saintsedgeshop.com/63-Saints_Mark_Ingram_Jersey[/url]. He doesnt crank out this staff any much better, still I question he may perhaps produce the security significantly even worse.

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