eSynic HiFi Headphone Amplifier Built-in Power Bank Portable Amp 3.5mm Audio Rechargeable Earphone Amplifier 16-300Ω Impedance with Gain Switch for MP3 MP4 Phones Digital Players and Computers

I was hesitant to purchase this at the price and the claims of it being able to drive 15 Ohm, - 600 Ohm headphones, plus it has additional features like the power bank output so you could charge your mobile phone if you needed to in a pinch.I have a good audio source and have several headphones and headphone amplifiers and, can say that this can drive all of my headphones way past my personal comfort level and the sound for me is very clean.The volume control knob has a relatively resistive feel (which is the ay it should be).I can't remember if they mentioned the specs, but I believe it makes use of a the HT97220 (MAX97330) line driver for the low gain which is capable of delivering 130mW into 32 Ohm headphones.There are also 4 x NE5532 Operation Amplifiers which I suspect is for driving higher impedance headphones in the 200 - 600 Ohm range {Sennheiser HD600, AKG etc.).-----------------------------------I have tried the amp the volume amplification (two gain selections Low and High were tested)Betron HD800 Headphones - [Wired] -32 Ohm / 50mm Drivers.Betron S2 Headphones - [Wired] - 33 Ohm Drivers.Sony ZX310AP Headphones - [Wired] 26 Ohm Drivers.Sony MDR-V150 Headphones with Reversible Housing for DJ Monitoring - WiredPlus a host of others but the above are most suited and what I have.----------------------------------------------------------------------Pros:- Good Price.- Good audio quality output and is suitable for listening to reading books as I could not detect any hiss or noise at its lowest level).- Great amplification, especially as most, if not all mobile phones I've had over the last few years have always disappointed me, this will bring music and revive some of our old headphones that are packets away.- Nice touch having the power bank feature#!Cons:- I found that the battery life was around 6 - 9 hours or so, but as I said, I do enjoy my music fairly loud and clear. If you're a moderate user, your mileage will be better.-----------------------------------Summary:For the price, it can't be beaten given its performance and feature set.

I brought this amp to work with a Bluetooth adaptor that didn’t have a functioning volume control. The volume range is very good. There is very little noise in the headphones, unless it gets turned up high.Build quality seems to be reasonable with a metal case. All the knobs and switches move smoothly and general feel good.I haven’t tested the life of the battery pack, but it seemed to hold up well for the couple of hours it was running itself and the Bluetooth adapter.

I was looking for a portable way to drive 80ohm DT770's and had been scouting about for a while when I came across this product. I've never heard of eSynic before, and as we know: any product at this price for what it claims to do is suspicious... So of course I bought it... ☺I see some bad review regarding an inflated Li-Ion battery - I've immediately looked inside mine and can report my battery and wiring look absolutely fine so it seems that guy was just very unfortunate.It seems to do the job, I can overdrive it with my main amp (which is probably not safe to do) but the little amp seems to handle the abuse quite gracefully. - It comes with both a 3.5mm aux cable which has a lovely tight braided cable finish and a little USB A to Micro USB cable too... So really... I think this is the most I've ever got for my money in quite some time, therefore I am happy. :)Many thanks!

Love this. I have fitted it to my motor bike helmet along with a a radio. I haven’t had it on full volume yet as that would be too loud, and sound quality drops with volume. I’ve used it every day for the last month and haven’t had to charge it up yet.

Sound on head phone not good

I am now profoundly deaf, so thought I'd try a few ideas.... Nobody understands how little hearing I have until they get a taste of this beaut pushing my Onedio 50mm driver headphones. For a microphone, I bought a Zoom H2 for £10 and turned monitor function on. I can hold a conversation and listen to some music. The Chinese electronics have really advanced and they have improved build quality.

Got this to boost the sound for Skype, did a good job, but I was expecting it to go lounder

Good sound boost and the powerbank option is really useful, I've used it for my phone and my e-cig.

Das ist ein sehr guter Kopfhörerverstärker mit sehr langer Akkulaufleistung. Ich bin sehr zufrieden

Fa quello che dice in più rispetto ad altri ha il boost dei bassi oltre 2 tipologie di volume selezionabili. Suona bene rispetto al prezzo, la batteria dura tanto, non usatelo mentre è in carica anche se si può fare emette un perché emette leggero ronzio , per il resto alza un po’ il volume e fa ciò che dice ad un prezzo onesto.

Lo compré porque pensaba que iba a ganar volumeny definición en mis auriculares reproduciendo música en mi DAP Hi-res. Y no lo termino de ver claro. Ni volumen ni definición. Será porque tal vez no sea el aparato adecuado o yo no lo necesitará en realidad. Ya lo seguiré probando con más calma.

Cet amplificateur de casque est génial !Tout petit, donc il peut se positionner n'importe où, avec un son bien meilleur que ce que j'aurais pu imaginer.Je suis très satisfaite de mon achat !

La batteria dura davvero tanto, il suono non viene manipolato. Da non utilizzare sotto carica perche si sentono interferenze. Lo uso con la mia id14 per dare più spinta alle mie dt880 pro da 250omh recupero un bel po di volume, da regolare secondo il volume ottimale d’uscita scheda per non avere distorsioni. Ottimo per qualità/prezzo