Douk Audio U3 Amplificadores para auriculares, mini amplificador de alta fidelidad para PC de computadora en casa, 6,35 mm / 3,5 mm, clase A, entrada RCA, CC 5 V

La solución para audiofilos analogos

Excellent midrange and more than sufficient volume

Lo uso con el Dac dragonfly Red. Para darle corriente lo uso con un cargador de las iPad viajas de 12 wat y no se escucha ningún ruido como comentan otras opiniones. Audífonos hifiman HE 400 SE. Ampliamente recomendado

Excelente custo benefício

Definitely don't like the sound of it. It's too "warm" And by warm I mean the high frequencies take the bite.It almost sounds muffled compared to the cheaper DAC I bought 3 yrs ago. It amplifies good enough and no feedback when plugged in a wall outlet. The pot seems better than what was reported years before. No issues there.I kept it for the low price. I ordered 4 OP amps since it's plugable . Maybe I'll get lucky there. I'll give some heads up when they arrive in about a month.Edit: Plugged in the Muses8920 and was greeted with the sound I was used to having! The VinTeam was not so great either for the higher freq. Too shrill at higher volumes.I ordered the Muses01 seeing the difference the 8920 made as the 01 is the pricier upgrade. See you next delivery!A 4th star was added. Would've made 5 if the Muses8920 was included from the start.Edit2: Plugged in the Muses01 and believe it or not but I'm getting goosebumps! Definitely an upgrade. Listening with the 8920 got tiresome after a while contrarily to the 01.So, $40 for the amp and $40 more for the 01 chip and you'll be thanking yourselves for trying it.Fifth star added. A real tiny treasure all in all with the right chip!

mal mucho mucho ruido incluso a volumenes bajos, ni suena tan bien.

Awesome amplifier, easily a thousand dollar sound selling for 2 figures, the signal to noise ratio is also extraordinarily impressive when powered by my power bank which is a DC power supply.

Excelente amplificador, probados con OneOdio Auriculares para PC A71 de 32 Ohms y 110db el volumen de amplificación es demasiado brutal, graves buenos sin llegar a retumbar en el oido, agudos buenos, identificas sonidos que ni imaginabas estuvieran alli, eso si, no los conectes directamente a la compu, "ensucia" el auidio, con una alimentacion de 5V a 1.8 Amp es mas que suficiente para que entregue un sonido nitido. Increible que este aparatito tenga semejante potencia. Necesario equalizar el sonido desde la aplicacion que uses.

Es excelente para amplificar la musica de la laptop o computadora de escritorio. Mis audífonos Sony XH1000M3 suenan espectaculares y mis Jabra Elite 85 que son para conferencia suenan may bien. Excelente producto

Este es un excelente Amp de escritorio que hará una buena combinación con fuente DAC que tengas en la mano.Material.Creo que por el precio del producto no podía pedir más, un botón de encendido en la parte trasera con sensación de "click" y un led que al ser encendido da color azul, también cuenta tiene su L/R Input con un cable de alimentación de corriente tipo USB, la construcción del Amp no están barato como aparenta ser parece ser resistente a maltrato de transporte, el potenciómetro tiene retroalimentación al ser girado dando una sensación de "Click" para acomodar al volumen deseado con una entrada de 6.3mm y que por cierto tiene su adaptador 3.5mm. *Nota* el potenciómetro al ser girado daba un rechinado al ser girado, esto se arreglo fácilmente agregando W40 con la plumita haciéndolo delicadamente a la orilla del potenciómetro con dos sprays en cada diámetro abarcando el 50% y haciéndolo girar y problema resulto.Sonido.Pues es un amp usualmente los amp no tienen firma de sonido por ello no tiene un sonido en particular, PERO siendo un amp estos si cambian la frecuencia de los audífonos haciéndolo posiblemente más filosos en los agudos y dándole un mayor punch a los bajos, ya que si no estás acostumbrado te parecerá muy agresivo pero es por lo mismo ya que levanta con mayor poder los audífonos y tendrás que tener más cuidado al subir el volumen o bajar *NOTA* el amp por si solo con cableado y siendo alimentado con un brick de 5V da un *hizz* de sonido de fondo nada que te vaya a explotar la cabeza pero tenlo en cuenta si esta usando audífonos de IEM o Cascos con resistencia muy baja, se menciona que con un eliminador de corriente de 20V elimina ese *hizz* ordene uno hace unas horas para testearlo y luego daría mi opinion al respecto. Ahora que es capaz de levantar bueno, creo que a este punto casi todo o simplemente todo, actualmente tengo HD560S y sin ningún problema estos los llega a levantar apenas alcanzo las 11AM del potenciómetro algunas canciones si piden más pero no van más allá de 1PM, ATH-M50X sin problemas alguno casi misma situación que los anteriores pero con una o dos hora menos de diferencia.La verdad por esa cantidad un verdadero pulgar arriba a este AMP ya que por su precio, potencia y tuneabilidad por ser su amp cambiable lo hace casi una necesidad si quieres mejorar un Setup-Cheap sin romperte tanto la cabeza.Lo tengo unido con cable L/R a 3.5mm a un Sony NW-A55 Walkman como DAC siendo alimentado con el mismo cable USB con un brick de 5V (pronto ser cambiado) de celular a la corriente y a una laptop.UPDATE 05/08/23Le llegue a conseguir un cargador de estilo laptop con una de las puntas le funciono la bueno/malo es que tiene adaptador de corriente entre una de ellas es de solo 19V aun con eso existe un pequeño hizz al fondo pero llegando casi al final de la perilla, mucho de este ruido desaparece al iniciar una canción.Por todo lo demás de es un grandiosisimo amplificador de audífonos con mucho poder para levantar prácticamente todo lo que se le interponga.

Occasionally, all or most of us at least, wind up purchasing an inexpensive audio device, expecting that it will perform far below expectations - yet our curiosity (based on having seen advertisements or word of mouth) have enticed us to complete the purchase. Such was the case for me when I happened to stumble upon this particular Douk Audio U3 mini head amp on Amazon - noticed the price - and wondered if it would even approach marginal status. And since I happened to have several budget level DAC's such as the Schiit Modi 3, the SMSL M100, and a few others, I thought, "Why not try out this budget head amp to see if it can hold up?"When it arrived I was not prepared to be impressed the way I was. To begin with, the U3 is built like a small tank, exceptionally well crafted with a logical, simple, and impressive front and rear panel layout. The craftsmanship of the U3 is more reminiscent of far more expensive products. Additionally, for those who understand and appreciate being able to make various modifications to electronic devices, the U3 has a pluggable op-amp socket design, which allows one to experiment with different sound signatures - with op-amps being a dime a dozen now-a-days (and Amazon has quite a few of them).Now it is important to note that this is a "Head Amp" only. If you have a DAC and want to connect it to a Head Amp which also has outputs on the rear of such a device to connect to speakers, etc., that will not be possible. The U3 has RCA inputs only (no outputs), so it will serve as a headphone amplifier only. And regarding the U3 being a great Head Amp - well, the best compliment I can give it is to remark, "The U3 truly gives good head...." HaaaaaaaaaaaaaaI first paired the U3 with the SMSL M100 - a simple, yet impressive entry level DAC. Now normally, I always allow audio gear to go through a period of burn-in for 24-48 hours (which I eventually did with the U3), but just for the heck of it, I began playing music through it immediately. Headphones used were the HiFiMan 400i 2020 version, Sivga 007, Philips SHP 9500, Status Audio CB-1, and the Brainwavz HM5. Music being used for evaluation were various large orchestral classical, big band jazz, Latin jazz, and other larger orchestral varieties. For evaluation purposes, It is always a good idea to listen to large orchestras that feature a wide variety of instrumentation. This gives you a good reference point how an audio component can relay orchestral timbres of each instrument.Even upon the first turn-on, I was immediately struck by the musicality of the U3 and the ability for it to further separate various instruments with the proper air or space around their locations. Previously, when I listened to headphones through the likes of the iFi ZenDAC, Soundavo HP-DAC1, Micca OriGen G2, Fiio K5 Pro, and FX-Audio DAC-X6 Mk II, they all displayed different sound signatures - with some models displaying a very bright sound signature, while others sounded bland, and some being very good for the money. With the U3, I was now hearing instruments that previously were not noticeable because of the blending of the sound within the various orchestras. Small, quiet instruments such as cymbals, triangles, and others, were no longer buried behind the entire orchestra. Rather, they were lifted and open to where you could hear them distinctly. All the instruments playing - whether via a full symphony orchestra or a smaller, more intimate jazz group - had this openness to the performances. It was as if a substantial veil had been lifted between the listener and the music. Additionally, imaging (the placement of instruments on an imagery stage) was so precise that you could envision the musicians and exactly where they were located. Depth was also exemplary. However, do keep in mind that if you are running a horrible recording or a poor stream of lower quality music, the U3 will let you know. I should also add that this particular budget head amp is a great device to determine how good your headphones really are.Now do note that I've long discovered (and believed) that warming up/burning-in an audio device is essential because the sound signatures can change over time. When you first turn on the U3 and begin listening, it is very detailed (with the stock Op Amp that comes with it) and dynamic - and perhaps may sound bright to some. As time goes on - in my case being just 48 hours being left on all the time - the overall audio character warmed up - yet the sound was still detailed with plenty of dynamics. As an aside, you should leave your DAC's and/or Head Amps on all the time as they use negligible power. It's just not good to turn off and on (constantly) audio components, and you'll eventually discover that your audio components will have a longer shelf life in the process.Another positive aspect about the U3 is that musical instruments have an accurate timbre to their sounds - not colored at all. I kept mumbling to myself, "Is this thing really a thirty-something dollar head amp?" If ever there was a piece of audio gear that defied expectations (for the better), the U3 meets that scenario. Following my discovery of the U3's capabilities, I then wondered that if the U3 sounded superb with the likes of the entry level SMSL M100 or the Schitt Modi 3 DAC's, what would it do with far more expensive and higher end DAC units? In fact, in my opinion, I'd still call it a bargain if the U3 was priced at $100-$125 - it is that good. Like I said, it makes you now want to pair it with far better (more expensive) DAC's to evaluate the sound quality, which I can only imagine would be improved even more so.Look - I do quite a few blogs and reviews about various audio gear. This Douk U3 threw me for a loop - I found it that stunning, given its ridiculously low price. I strongly suggest picking one up before the price rises. I'm actually in the process of ordering a second one - mainly so I can change out op amps in one, while keeping the other with the stock op amp. At this price, it's a no-brainer. Given my previous experiences with evaluating high performing, yet very inexpensive audio items - which after a series of excellent reviews - were predictably followed by price increases by the vendor. I believe that once Douk sees the reviews on the U3, like anything else, they may very well raise the price.Now let's address the ability to easily remove and change out the Op Amps. This is something I had initially not considered doing with the U3, but since Douk specifically advertised this feature, that piqued my interest. So I purchased several Op Amps and tried them all. And yes, there were sound differences - some making the U3 sound brighter, some harsher, and some warmer. I found that upgraded Burson Op Amps - albeit a bit more expensive - did the best and noticeably elevated the sound performance of the U3. The Burson V5 version homogenized the sound, had a warmer upper register, yet still maintained excellent detail/definition, and had quite a bit of weight to the music. Also keep in mind (remembering about what I wrote above about allowing an audio device to be broken-in), when you switch Op Amps, as they warm up, their sound character will also change and usually for the better (meaning an increased warmth to the audio). So when you first insert an Op Amp in the U3, it may at first sound brighter, but don't let that dissuade you. Give it a few hours or up to 48 hours to be able to notice a discernible change in sound character. Be careful with op-amps though because if you insert it the wrong way (like backwards), you will immediately burn out/destroy the op-amp (not the unit). So before you do any op-amp rolling, PLEASE - be careful and know what you are doing. Given that, the op-amp that comes with the U3 is quite competent and musical sounding.Well, how about any negatives you may ask? Well, yes there is one (subjective) - and that is the front blue light which indicates on/off status of the U3, is rather large (and bright) when compared to the rest of the unit. It features an overly bright blue light which can light up a room at night (without exaggeration). When it's on, especially at night - and your sitting close to it such as by a desktop computer while listening to music - it can be extremely distracting because of its brightness. And when that light is "blue," somehow it becomes more pronounced. It would have been nice if Douk designed the light to be either red or green, which would have toned down the effect somewhat. So that's the only negative thing I can report really.I was so impressed with the U3 that I purchased a second one shortly after getting the first copy.Now when it comes to support - wow, are they good! After 4 months or so, one of my U3's developed a loud hum in the headphone jack. At first I thought it was the headphone I was using, but soon discovered that something happened with the U3. So here it was - June - and I contacted Douk via Amazon. They were quick to respond - didn't ask any questions - and sent me a new U3 in a jiffy manner. Now that's support to the maximum.So, based on its uncanny low price vs its ridiculously high performance ratio, I am enthusiastically rating the Douk Audio U3 mini head amp with 5 stars. It's just that good!!!!

Compré este Amplificador para audífonos Douk en Amazon USA para usarlo con el DAC " Khadas Tone Board Hi-Res " y resulto un amplificador muy aceptable. El audio que entrega es definido, analítico, los instrumentos estan bien ubicados en la escena sonora la cual es amplia, no tiene realce en ninguna frecuencia, su sonido es plano. Utiliza 2 pares de transistores trabajando en clase "A" ( seguramente es clase AB ) y un amp. operacional de bajo ruido NE5532 que puedes remplazar en caso necesario. Los audífonos con los que lo probé son unos Beyerdynamic DT 770 Pro, Sony MDR SA1000, AKG 240 ( Made in Austria ), estos últimos hacen una excelente pareja con el amplificador y los maneja sin problema a pesar de que son de 600 ohms. Cabe aclarar que la calidad de audio de la salida de tu pc o notebook no se compara en lo mas mínimo con un DAC externo 🤤, por eso te recomiendo que uses este amplificador con un DAC para que obtengas la mejor calidad de audio. Actualización : Reemplace el NE5532 por el OPA2134 y obtuve una mejora en la calidad de audio. NOTA IMPORTANTE: Si tu amplificador tiene ruido de fondo muy alto o evidente, se puede deber a dos causas principalmente, una, la alimentación, busca un buen eliminador o intenta con varios, y la segunda, el ruido se puede deber al control de calidad del circuito integrado ( NE 5532 ) ya que para hacerlo costeable, no siempre usan los circuitos con los estándares más altos, simplemente piensa, el OPA 2134 cuesta unos $200 pesos en México, casi una tercera parte del valor del amplificador.