Зачем нужен портативный усилитель для наушников?

       

Зачем нужен портативный усилитель для наушников?

Что такое портативный усилитель для наушников?

Из названия не сложно догадаться, что усилитель для наушников занимается усилением сигнала и позволяет получить на выходе наушников необходимую громкость. Соответственно возникает вопрос, зачем нужны к примеру портативные усилители для телефонов, ноутбуков и плееров, если громкости с последних и так достаточно?  

Портативные усилители и наушники PHIATON и ULTRASONE
 

На самом деле устройство, называемое как «усилитель для наушников», выполняет две задачи, обеспечивает необходимую громкость у наушников и передает сигнал без искажений. Вторая функция не менее важна, т.к. при достаточной громкости у современных телефонов и ноутбуков слабым звеном остается качество.

Представьте себе два автомобиля, оба могут разгонятся до 100 км/ч, но один едет уверенно и точно, а другой трясет и постоянно заносит из стороны в сторону из-за неровных колес, неудачной подвески и разбалансированного двигателя. То же самое можно сказать и про усилители, громкость, это лишь один из параметров и несомненно важен, но лишь как первое необходимое условие (может автомобиль ехать с нужной скоростью или нет). Вторым условием является качество звучания и в большинстве случаев именно за качество звучания и назначается стоимость за устройство.

Усилители можно разделить на два основных вида – стационарные и портативные. Стационарные усилители питаются от розетки и в дороге соответственно работать не будут. Портативные усилители имеют автономный блок питания на батарее или батарейках и предназначены для использования в дороге или вдали от каких-либо розеток.  


В чем основные особенности портативных усилителей?


Портативные усилители в большинстве случаев компактны. Условно их можно разделить на два типа, одни для наушников-затычек (самые компактные и с выходным напряжением 0.5-2 В) и для полноразмерных наушников (более габаритные с выходным напряжением от 1 В).
 
Мобильный телефон, портативный усилитель и внутриканальные наушники

Если в телефонах и портативных плеерах в большинстве случаев стремятся к компромиссу между габаритами и временем работы устройства, то в отдельных усилителях больше уделяется внимания именно качеству звука. При разработке телефона большое внимание уделяется минимальному энергопотреблению всех элементов, т.к. это позволяет использовать более компактную батарею и соответственно получить меньшие габариты устройства. В итоге, вместо хороших микросхем или дискретных элементов в тракте усилителя для наушников выбирается максимально экономичная микросхема. Эта экономия, как правило, и выходит боком, а экономичные ШИМ усилители выдают безжизненный и раздражающий звук, приводящий часто к утомляемости от прослушивания. С такого устройства возникает желание сделать звук громче ради лучшей слышимости деталей, но это зачастую плохо помогает и в противовес лишь может снизить слух.

Выходом из такой ситуации становится внешний портативный усилитель, который подключается в гнездо выхода для наушников (или в линейный выход, если такой есть), а наушники соответственно подключаются к портативному усилителю.

Портативные усилители для наушников-затычек, как правило, очень компактны, а усилители для портативных полноразмерных моделей более габаритные. Помимо более высокого качества звучания, портативный усилитель способен продлить и время работы плеера или телефона, т.к. является высокоомной нагрузкой и соответственно потребляет очень мало тока от внешнего устройства, а для усиления сигнала использует уже собственную батарею.

Ламповые стационарный и попртативны усилительи типовой плеер SONY
 
В большинстве случаев, портативные усилители транзисторные, но встречаются и ламповые. Ламповый портативный усилитель, как и стационарный, больше греется и требует более бережного обращения. А также такой тип редок и в бюджетном секторе не был замечен…

Как подобрать портативный усилитель?


Если с позиции характера звучания – это исключительно субъективная сторона вопроса, то с позиции громкости все немного проще. Для начала оцените габариты усилителя, если он маленький, размером существенно меньше сотового телефона, то не стоит ожидать, что он раскачает полноразмерные наушники. Посмотрите его характеристики, если там будет указано выходное напряжение без нагрузки, выходное сопротивление и максимальная выходная мощность к определенному значению сопротивления наушников, то можно сделать расчет его параметров, а далее, зная чувствительность ваших наушников – оценить итоговый уровень громкости. До расчетов, загляните в раздел измерений усилителей, возможно он там уже измерен и тогда достаточно быстро можно сделать расчет через online калькулятор.
 
Ламповый портативный усилитель, типовой плеер SONY и наушники Phiaton

Из общих рекомендаций, для внутриканальных наушников выходное напряжение должно быть в пределах 1-2 Вольт, для полноразмерных – до 5 Вольт (при условии, что усилитель выдаст это напряжение без перегрузки на конкретном сопротивлении).

Для более простого понимания округленного расчета, если у наушников чувствительность 125 дБ/В, то от 1 В будет звуковое давление в 125 дБ, от 0.5 В – 119 дБ, а от 2 В – 131 дБ.  




Автор: (PAExpert) Эксперт Personalaudio.ru
17.12.2012


Нашли опечатку в тексте? Выделите и нажмите Ctrl+Enter. Это не требует регистрации. Спасибо.

Поделитесь в социальных сетях




Еще интересное для чтения

Комментарии и отзывы (14)


Страницы: Пред. 1 2
Мне нравится0
Gera Julia
Portable amplifier earphone needed in order to reduce the percentage of distortion in the speakers, the less wire length, the better the output signal after processing by the amplifier.
Мне нравится0
kalambur
asd
Мне нравится0
poligraf
Чтоб лучше слышалось)
Мне нравится0
dongdong
Girlfriend regardless of my opposition Coach Outlet Online, resolutely chose to go abroad Coach Factory Outlet. I know that although the study abroad is only a year or so,Coach Outlet but this is the signal of breaking up.Coach Outlet Stores So she went abroad, Michael Kor Store Online we only have the first month of contact,Michael Kors Outlet after the time we broke the contact, broke up.Michael Kors Factory Outlet I heard my old girlfriend broke up,Michael Kors Outlet Online the most anxious natural than my parents michael kors store online, because I have 30 early,Coach Outlet Store Online like me so much of the neighbors can play soy sauce Michael Kors Outlet online, but I now and his girlfriend broke up Coach Outlet.My parents regardless of my opposition Michael Kors Outlet, began to give me a variety of arrangements blind date,cheap nike air max he did not say if I do not The North Face Jackets find a girlfriend this year nike air max, then, Ray-Ban Sunglasses Outlet and I will cut off the relationship Jordan shoes, although I am very exclusive blind date cheap jordan, but now only Accepted.Tory Burch Outlet Online Really do not say,tory burch outlet store so blind date I still met my girlfriend cheap Oakley, she was similar to my age,oakley sunglasses outlet to meet when I think this is a very good girl,ray ban outlet because of this reason, cheap ray ban sungalsses we began to contact.Began to feel good,coach outlet store US I also determined to continue with this person,north face jackets she is really good,Michael Kors Outlet but some of her actions make me very speechless,kate spade handbags Outlet because she always intentionally or unintentionally mention her ex-boyfriend,Ralph Lauren Outlet Boyfriend comparison.It makes me no way to accept, Coach Outlet I would like to break up,the north face but my parents do not agree,Coach Factory Outlet Online because they feel my girlfriend's condition impeccable,kate spade good temper, coach outlet good character.Coach Factory Outlet I am really at a loss, Michael Kors Outlet because I do not know whether marriage can be,polo ralph lauren outlet I really do not know how to deal with the.Polo Ralph Lauren Because his girlfriend in addition to the habit of speaking yeezy boost, she really impeccable, Christian Louboutin Outlet good for me, adidas nmd shoes but also generous introduction to my friends around me,Pandora Jewelry Sale in the end I want to continue this love it.true religion outlet will be a little more romantic than the smooth and layered,Salvatore Ferragamo holding the bag to add exquisite elegance,Christian Louboutin Shoes bright red lips to mention more true religion jeans color points.
Страницы: Пред. 1 2

Возврат к списку >>>




sha zhi 24.04.2018 05:35:25 For scuba divers that are not utilizing a scuba diving plunge pc to handle their own nitrogen amounts Dejounte Murray Jersey , you need to make use of plunge furniture in order to keep an eye on down time. To make utilization of these types of furniture successfully, the plunge view is needed. How’s the plunge view not the same as a regular watch? 2 points allow it to be stick out. Very first, and many certainly, plunge wrist watches tend to be water-resistant. They likewise rolex Air King replica have the revolving bezel. Water Opposition — a genuine plunge view may have the level or even stress score. Keep in mind to consider level rankings which are less than you are planning to proceed. The actual level score is actually once the view halts operating, and that is some thing you do not wish to encounter. Consequently David Robinson Jersey , even though you aren’t likely to proceed much deeper than the usual 100 ft, locate a plunge view that is ranked for 2 100. Keep in mind that easy water-resistant wrist watches are not the same. As you may take the bath or even clean your own meals together upon, they’ve absolutely no capability to endure stress, and can split or even drip whilst scuba diving. You’ll find plunge wrist watches which proceed in between one hundred as well as 3 hundred back yards in many stores, plus some niche kinds tend to be ranked with regard to 500. Nevertheless David Lee Jersey , the greater stress your own plunge wrist watches is actually ranked with regard to, the greater costly it will likely be. Adjustable Bezel — The actual bezel may be the revolving call in your plunge wrist watches encounter. It’s the tip sign, letting you line up the actual bezel together with your moment hands as you prepare in order to plunge. It’s going to remain place as long as you’re below drinking water. To determine just how long you have already been lower, consider the placement fr om the tip, that is whenever you started the actual plunge Danny Green Jersey , as well as evaluate this towards the placement fr om the moment hands. Great plunge wrist watches possess obvious, readable encounters which permit you to observe how much time you have already been lower. With regard to security factors, the actual bezel on the great plunge view is only going to change counter-clockwise. That is to ensure that should you bundle this and obtain incorrect info, it’s going to let you know that you have already been lower lengthier compared to you’ve, instead of letting you remain lower with regard to additional time compared to you need to. While a great plunge view could be costly Bruce Bowen Jersey , Rolex Datejust replica it is really worth the price over time. Without having this, you can’t really period your own plunge properly, as well as that may be dangerous for your wellness. Luckily, you’ll find plunge wrist watches very easily. Because they’re therefore long lasting as well as water-resistant, they have gain popularity because wrist watches with regard to road put on. Simply watch out for purchasing replicas which have the appearance San Antonio Spurs Hats , although not the actual options that come with the plunge view. Go swimming stores, sports shops, as well as low cost shops on the internet just about all have plunge wrist watches, therefore obtaining 1 before you decide to go swimming underneath the area is straightforward. Companies, firms San Antonio Spurs T-Shirts , as well as individual households need specialized cleaning and maintenance services, especially when the real estate objectives and the buildings and homes they liveoperate in are harder to maintain with self sustained efforts. There are cases where the individual has got to make a choice between maintaining the aspect of a certain objective himselfherself or actually choose to let someone who is specialized in dealing with these situations and has the right equipmentpersonnel to do it. In the case of roof cleaning Delaware certain buildings and structures can be too complicated and too hard to escalate and clean with one’s own resources, not to mention the dangers that are to be expected when work has to be done at heights. Along with the necessary safety equipment, another important aspect of a company that deals with these types of situations is the fact that they will allow one to get the job done faster, without incidents and at a level of quality that is beyond the reach of one single individual’s abilities. There are also other types of services that are generally the work of specialized companies San Antonio Spurs Hoodie , such as pressure washing Maryland where highly specific equipment will be used to clean and disinfect a certain area and a certain type of material. Overall, however, no matter what one wishes to accomplish, there is always the idea that a specialized company will know some secrets and some techniques to do a better, more proper job Customized San Antonio Spurs Jerseys , especially for places where cleanliness is essential – such as in deposits wh ere food is stored or in office spaces, wh ere many people come in and out and a certain level of cleanliness is provided. The types of objectives that require interior and exterior cleaning can also benefit from gutter cleaning MD, services which are intended to provide a clean stream of running water and that can impact the way a certain area or an entire city handles its many possible infection spreading areas. These spaces, in certain conditions might also require power washing MD and, even if these services are most of the times contracted y the municipality and the mayor’s office Cheap San Antonio Spurs Jerseys , there is also a possibility that they will have to be considered by individual contractors in certain areas. No matter what type of cleaning one requires in the regions of Delaware and Maryland, the companies providing these services have to be chosen carefully. The more experience in the field, the more likely it is that the company will have better equipment, better trained ind.
sha zhi 24.04.2018 05:32:59 The occasional presence of bubbly urine when a man urinates is normal and can be caused by numerous things. However San Antonio Spurs Hats , when bubbly urine is a chronic occurrence, it could be a sign of a potential male organ health issue – or even of a health issue that extends beyond the member. So paying attention to bubbly urine and determining its cause can be a benefit for a man. Proteinuria As with most things related to health, there’s a medical term for bubbly urine – proteinuria. It doesn’t apply to all causes of bubbly urine. For example, sometimes urine may produce a foamy effect simply because of the force with which it is expelled fr om the body or because the water in the toilet bowl has some cleanser in it which foams up. And sometimes excess carbonation may cause it San Antonio Spurs T-Shirts , or the presence of bilirubin. When bubbly urine is called proteinuria, that is because the bubbling is caused by too much protein in the urine. It’s normal for urine to contain some protein. And sometimes the reason for excess protein is fairly benign. For example, sometimes too much stress can bring this about, as can dehydration San Antonio Spurs Hoodie , pushing too hard at the gym or even bad posture. UTI But often proteinuria occurs because of another condition. It may be a sign of a male organ health issue, most commonly a urinary tract infection (UTI). A UTI typically occurs when bacteria that enters the urinary tract doesn’t get disposed of; some lingers in the tract, wh ere it creates an infectious condition. With a UTI, a man may need to urinate more frequently and may experience a stinging or other painful sensation while urinating. He may also feel stomach pains and may find his urine has developed a rank odor. Most UTIs are treated with antibiotics Customized San Antonio Spurs Jerseys , which kill the trouble-causing bacteria. Some other medications may also be recommended to attend to the pain that a UTI can cause. Other issues But proteinuria may also be a sign of issues that extend beyond male organ health. Some of the conditions of which proteinuria may be a symptom include: • Diabetes – a disease in which the body has too much glucose (sugar). • High blood pressure – also called hypertension, a condition in which blood pressure exceeds acceptable limits. • Kidney issues – several ailments affecting the kidneys, the organs which filter blood to make urine and remove waste from the body. • Cardiac issues – problems related to the heart which impedes its ability to function correctly. • Rheumatoid arthritis – a long-term autoimmune disorder that affects a person’s joints. • Lupus – an autoimmune disorder in which healthy tissue is attacked by the body. If a man notices that he is producing bubbly urine on a consistent basis, he should consult with his urologist to determine if proteinuria may be the cause. The doctor will collect urine samples to test Cheap San Antonio Spurs Jerseys , which will measure the protein levels. Often proteinuria produces no issues and can be treated by increasing the amount of water a man consumes on a daily basis. Paying attention to bubbly urine is a smart move, as is keeping an eye on manhood health in general. Men that are serious about the health of their manhood should regularly use a first class male organ health crème (health professionals recommend Man1 Man Oil, which is clinically proven mild and safe for skin). Look for a crème with both vitamin A and B5. Vitamin A, which some refer to as retinol Tony Parker Spurs Jersey , helps to fight the aging process in manhood skin. Equally important, its anti-bacterial properties provide a good shield against excessive and obnoxious male member odor. Vitamin B5, meanwhile, is a nutrient which keeps manhood cell metabolism and tissue in better health. SHANGHAI Tim Duncan Spurs Jersey , April 14 (Xinhua) -- Chinese tennis legend Li Na, who was nominated for the sportswoman of the year in the Laureus World Sports Awards, said Tuesday that she enjoyed the life after retirement from tennis, saying that "I can sleep until I wake up natural." "To sleep until natural wakeup" has been a dream for Li Na Sean Elliott Spurs Jersey , who was forced to retire because of knee injuries after winning her second Grand Slam title - the Australian Open in 2014. She told media last April that "I did not sleep well for long. I really hope that I can sleep until I wake up natural when I don't have any matches and trainings." "My life now without tennis is different. But I don't think I can live without tennis, it's been part of my life," said Li Na, who became the first Chinese to win the Grand Slam title when she won the French Open in 2011. "But it is unimaginable at the moment to think of a comeback to professional tennis Patty Mills Spurs Jersey ," added Li. Retrospecting her tennis career, Li Na said the most memorable moment was when she sailed into the Australian Open final in 2011 before losing to Belgian Kim Clijsters in three sets. "It was for the first time I was so close to have a touch of the Grand Slam trophy." Li Na is now one step away from Laureus sportswoman of the year award, competing with other five candidates including American tennis star Serena Williams and Norwegian skier Marit Bjorgen. "I am happy enough to be nominated in the pool," said Li. "It could be perfect if I can win Manu Ginobili Spurs Jersey , but it is up to the Laureus Sports Academy members to decide." It is the second time Li Na entered the final pool after 2012 when she became candidate for the sportswoman of the year. The winner will be announced Wednesday. Phoenix Plays Can Be Very Moving Affairs December 24, 2014 | Author: Dominique Martin | Posted in Arts & Entertainment A regular function of theatre owes its motivation to the hist.
sha zhi 24.04.2018 05:30:54 Southern Trust Property Management Fruitful To Get A True And Adoring Property Beaton Mestayer Submitted 2014-02-21 08:19:05 In case you have rental properties Seth Jones Blue Jackets Jersey , you should think about hiring Southern Trust Property Management Experts to manage your own rentals. There are several reasons why you should consider hiring property management experts for the properties. Southern Trust Management Specialists can help release your time as well as boost your procedures. Although employing property management experts may be seen as an extra expense in your business, the advantages far outnumber the costs. If you hire Southern Trust Management Experts to manage your own rentals, you will get to take pleasure fr om five significant advantages. The first benefit is that Southern Trust Management Experts have vast experience with the business of property management. This means that they have examined hundreds or perhaps thousands of tenants' applications and can easily assess a great applicant's paperwork and choose if the consumer is suitable to be able to occupy your own units Verification of renters is a good way of ensuring that you simply receive tenant who will cooperate rather than tenants who are likely to cause problems for you personally. Another benefit regarding hiring Southern Trust Property Management Specialists to manage your rentals is that your tenants will always have someone to talk to every time a problem occurs in the flats. In case one thing breaks within the property Sergei Bobrovsky Black Jersey , it may be the hustle to drive all the way to inspect this personally specifically if you don't live close by. With a property management expert at hand, the tenants will always have somebody to address virtually any problems that might arise and you also don't have to be irritated about spending some time to sort out the difficulties. The other advantage of hiring Sothern Trust Property Management Professionals to manage your own units is always that tenant turnovers will probably be at a minimal. The property management professionals will ensure that tenant retention is improved in your units. Tenants who may have had a good time in their stay in their units will surely want to extend their remain and even restore their leases. A good property management expert knows how to preserve tenants happy and tenants who are pleased are less likely to move or perhaps look for a far better place. There is also to enjoy early on rent payments from renters when property management specialists are handling your property. Southern Trust Management Specialists understand that the important thing to getting rent punctually is uniformity in collecting rent obligations. Moreover property management specialists will impose lease contracts if a tenant fails to pay out. This makes sure that you don't have to get involved in times when there are issues in payment of rent. Author Resource:- Hiring Southern Trust Management Experts to manage your property is that you will experience less stress. For more details please visit rentals. Article From Article Directory Database PARIS, July 3 (Xinhua) -- Offering extra time to France to respect its financial commitment to the European Union (EU) is not on the agenda Artemi Panarin Black Jersey , said Pierre Moscovici, European Commissioner for economic and financial affairs on Monday. Asked by France 2 TV if the EU would accept a possible request from Paris to delay its plan to cut its budget gap, Moscovici said "It is out of the question Seth Jones Black Jersey , no delay, only a serious budget policy needs to be on the table." The former economy minister added that he expected the new French government to "present a 2018 budget draft that will allow to pass below 3.0 percent and allow France to get out..om the excessive deficit procedures." In 2015, the EU offered France extra time to bring its budget gap to the safe line. However Kids Sergei Bobrovsky Jersey , the EU urged the French government to take additional measures and fiscal reforms to deliver on its promises. France, the eurozone's second main powerhouse, has a target to trim its budget deficit to 2.8 percent of gross domestic product (GDP) this year Kids Artemi Panarin Jersey , the first time in a decade it will have respected the EU-imposed lim it of 3.0 percent. Chinese aircraft carrier formation conducts trans-regional training Weekly choices of Xinhua photo 2017 Canada Day Parade held in Vancouver 2017 Women Hocky World League semi-final: China vs. Netherlands Weekly choices of Xinhua photo In pics: sea of vervain in terraced fields in E China Fireworks show held to mark HK's 20th return anniversary Water level of Ganjiang River rises due to lasting rainstorm CHICAGO, Jan. 2 (Xinhua) -- Kidney disease increases the risk for diabetes, not just the other way around Kids Seth Jones Jersey , a study of the Washington University at St. Louis has found. Researchers at the university found that kidney dysfunction can lead to diabetes, and that a waste product called urea plays a role in the two-way link between the two diseases. The study involved the analysis of medical records over a five-year period for 1.3 million adults who did not have diabetes. About 9 percent had elevated urea levels, a sign of reduced kidney function. That's the same rate as in the general population. People with high urea levels were 23 percent more likely to develop diabetes than those with normal urea levels Womens Sergei Bobrovsky Jersey , the study found. "The risk difference between high and low levels is 688 cases of diabetes per 100,000 people each year, which means that for every 100 Womens Artemi Panarin Jersey ,0.

Система Orphus

Яндекс.Метрика