Headphone Amplifier DAC Portable Amp - HiFi Audio USB Earphone Amp Decoder ES9028Q2M XMOS XU208, Support 16-600Ω Earphone 32bit/192KHz DSD256 with Bass Boost and Gain Switch for Phone Laptops PC MP3

This is an excellent portable amp for your phone! It definitely gave headphones a cleaner sound and also really helped power headphones with high impedances. I have the Fostex T50rp Mk3 which need quite a bit of power to work and this did a pretty good job at it.Another thing I like about this is that it is built very well, everything feels solid and I don't worry about this breaking anytime soon. It's very sleek and small and doesn't make your phone too bulky. The volume control and ports are placed nicely as well.The battery life is rediculously good. I couldn't believe how long this thing lasts! Also I thought the price for this was very good for what you get.I would have liked to have seen better cables however. The mini aux cable that comes with it is very cheap and doesn't work very well.

Sound and DAC were perfect, but it can be interfered by a phone (Makes noise when there's a phone near it.)

Overall this thing is pretty much unbeatable at this price and this size. I've been using a C&C BK for the past 4 or so years and to be honest I still prefer its sound, but it does not function as a DAC and, truth be told, I'm probably just used to its sound. The NX2 is less coloring to the music, a more "clinical" sort of sound, which is far better than too much color if I had to choose.Some of the best listening I've ever had is plugged into my Lenovo using the NX2 as DAC and jumping that to the C&C and out to a pair of Triple.fi-10 IEMs. Pretty effing spectacular, really. I get the noise free accuracy of the NX2's DAC and the extra warmth and punch from the BK. Obviously that's slight overkill. :) Or is it?Anyhow - I don't go around with two headphone amps. I would say the NX2's amp fuction is a bit warmer and more "sparkly" possibly due to the high roll-off in the DAC stage another reviewer mentioned. Not that big of a deal - it sounds great. Beats the pants of the noisy and *extremely* inference-prone DAC onboard on my laptop. In comparison the NX2 is utterly SILENT during song pauses, to the point it was disconcerting because I'd gotten so used to hearing a bit of "running noise" as it were with this dang laptop.The amp stage sounds great, a bit better I'd say, but I've not listened nearly as much that way and honestly I'd still pick up my BK 50% of the time ... but the battery does last longer with the NX2 and it's thinner.... Though it is slightly wider and longer than the BK, the fact that its roughly the size of a credit card but is thinner than the girth of a pencil, it's just as, if not a bit *more* pocket friendly.Great little amp/DAC. I was gonna spring a bit more for the new FiiO Q1.... I'm glad I didn't.

Nice little Amp. Be mindful that this unit is AMPLIFIER only! If you need a amp/dac combo this is not the one. It is a great amp and definitely boosts the volume for my headphones that need a little more push. Most smart phones have their dacs onboard, so increased volume may be all you need. Two thumbs up for this amp with the super battery!!!

Unfortunately, my unit had a bad power switch and did not like to stay on even after a sufficient charging period. I do not see many people with this problem so I will not give the product one star as the bad switch seems to be an anomalous experience. If I fiddled with the switch and held it still I could get the power to stay on and I can say the battery lasted as advertised and sound to my ATH-M40x headphones from S7 Edge and ancient desktop at work was much improved. I'm not a huge fan of the loose volume wheel nor the pokey power switch so I will likely try a FiiO or SMSL product next.I will, however, recommend purchasing this item from a different seller. The unit had the problem out of the box and I contacted the company for advice. They asked me to make a YouTube video of the problem (a first for me) and I complied, only to not hear from them again. I made several Amazon-confirmed attempts at contacting them for a week and received no word back.Thankfully, Amazon made my return painless and made funds available for me to get another DAC amp on the same day. I'm truly impressed by this.

Less power than my cellphone and TONS of static. Must use in airplane mode with my phone.

Not enough power . Very well-made .

I have been using this with my Sennheiser HD 598, and it's a big improvement over my laptops 3.5mm out. They were already loud enough with the onboard sound, but the NX2 improves clarity, especially at lower volumes, and I think there's better bass response than I was getting before too.The unit came partially charged, and plugging it in with the included micro USB to USB cable triggered an automatic driver install in Windows. You can then select the DAC as the audio output in the Volume Mixer.The build quality (especially metal body) is pretty impressive for the price, although the power switch and volume dial do have a little wobble to them.

Very clean sound. I'm still trying to figure out if it works better as a DAC and amp, or just an amp. Either way, it's extremely clean, it gets out of your way and lets your earphones and the music shine, which is what it should be doing. The size and battery life are simply outstanding. It's the exact same size - in width - to an iPhone 5/SE and about 2/3 the length. Very portable. Likely better than your DAC on any phone or laptop. Definitely amps 320 ohms or less. If you have a 600 ohm headphone, I would look elsewhere however.

Ca marche bien et maintenant je peux écouter ma musique de l'iPhone dans la voiture. Petit et discrete, bien construit et sans problèmes.

Well, I don't know what I expected.... but going in without high expectations maybe is why I'm "impressed"... this little thing packs a Mike Tyson punch... its ability to amplify the sound is great... crystal clear and powerful... I recommend it. I don't know if there are others more "affordable" products available that deliver the same... but I have no buyers regret.. I love it.. Now I guess I would love to try a "high" fidelity track to see what all the fuss is about...

1) Confezione e dotazione: completa, vengono forniti 2 lacci in gomma per tenerlo solidale ad un dispositivo portatile, un cavo usb micro-usb di 15-20 cm per collegarlo in modalità dac o vicecersa ricarlo, un cavo con prese jack da 3.5 per collegarlo in ingresso come solo stadio di amplificazione. In ultimo degli stratch adesivi circolari per facilitarne la portabilità e un piccolo panno per la pulizia. Voto 92) Hardware: non mi dilungo sulle specifiche tecniche del Texas PCM 2704 a bordo del topping, basta dire che non necessita di driver aggiuntivi, quindi è ampiamente supportato. Discrete le caratteristiche, campiona a 32 bit con frequenza a 44.1 o 48 garantendo un range dinamico di 98db a 32 ohm. In conclusione è ideale con cuffie che stiano su quel range di impedenza, anche perché lo stadio di amplificazione non è elevatissimo e proprio questo forse è il limite del topping, ma d'altronde per garantire portabilità e durata della batteria la vittima sacrificale doveva essere chi di corrente ne chiede tanta, quindi proprio lui. La batteria da 1000 mha dura parecchio garantendo ascolti dilungati anche per diversi giorni. Presa micro-usb per il dac e micro-usb per la Ricarica.Voto 83) Ascolto: il topping nx2 ha due anime, molto diverse. Per la prova ho usato file mp3 a 320kbps, Neutron come lettore (eq.flat) su Asus zenfone 3 con Android 6.0 e cuffie Sennheiser HD 595 (50ohm) e Akg y50 (32ohm). A riprova della natura portabile del topping la scelta di tali cuffie era scontata se non dovuta. Arriviamo al sodo: usato come solo stadio di amplificazione non è proprio il massimo, se la cava con una sufficienza. Tendono a dominare le frequenze basse e il suono risulta quasi sempre ampolloso e gonfio. Usato come dac il suono cambia in maniera considerevole, le frequenze sono sullo stesso piano e il suono è decisamente più naturale, equilibrato e soprattutto pulito. Ovviamente qui gioca un ruolo importante la sorgente del file e il suo bit rate, quindi le mie considerazioni si basano unicamente su file mp3 da 320kbps, più che sufficienti per un ascolto di qualità. Come detto la conversione analogica è buona, restituendo un immagine sonora dettagliata e pulita, priva di jitter, ma soprattutto il soundstage restituito in cuffia è notevole se rapportato alla natura portatile ma soprattutto al prezzo del dispositivo. Con le Sennheiser e l'unplugged di Eric Clapton gli strumenti hanno la giusta profondità e non si nota nessuna dominante di frequenza. Come accennato prima ci vorrebbe un amplificazione superiore, perché anche in dac si percepisce uno stadio ampli sottotono. Ma se stiamo su cuffie intorno ai 32ohm va più che bene. Di sicuro l'ampli non è all'altezza del dac ed è un peccato, ma va bene così se vogliamo avere un'audio di qualità in un sistema portatile. Voto 7,5Conclusioni: se volete un sistema portatile che non costi molto ma che vi garantisca un'ascolto da audiofilo nei paraggi dell'alta fedeltà(o quasi, atteniamoci alla realtà!) Il topping nx2 è un ottima scelta. Se volete invece un sistema che piloti e amplifichi cuffie ad alta impedenza il topping vi mostrerà la sua sofferenza di vocazione portatile e dovrete andate su altri lidi, sicuramente più costosi.

Seguramente el mejor amplificador portatil del mercado. Sonido espectacular. Soy incapaz de ponerlo a tope, te quedas sordo. Los utilizo con el movil y con el ipod y se oye de fabula. Mueve sin problemas mis auriculares de 250 ohmios sin darle mucha caña. Aumenta considerablemente el volumen de los equipos conectados. Tiene un tamaño finisimo, no pesa nada y tiene una autonomia de unas 10 horas.Ofrece un sonido muy limpio sin enmascarar, no se oye ruido de fondo perceptible (a unos volumenes normales). Una calidad de sonido excelente.