AIYIMA A07 Premium TPA3255 Power Amplifier 300Wx2 HiFi Class D Amp Mini 2 Channel Stereo Amplifier with Pre-Out for Desktop Bookshelf Speaker Home Audio System & DC32V 5A Power Adapter

Prodotto validissimo, ma io avevo la necessità dei controlli di tono.

Bon rapport qualité prix! Surpris par sa puissance par rapport à sa taille. Bonne qualité sonnore sans être exceptionel.

Holy crap. It really works. Needed to replace a receiver. But as I'm only using it for 2 channels (2 speakers) with record decks I thought I'd chance it. Hooked it up, works and sounds perfect. Its so small but so powerful. Whoever put this together give yourself a pat on the back.

Soy un audiófilo. Tengo un amplificador de potencia DMA-200 espectral (el modelo actual es de $ 400,000mx) que se arruinó, por lo que estaba buscando un amplificador de potencia barato para poder usar mi sistema de altavoces Magnepan Mini Maggie ($ 50,000mx) a un nivel degradado. Tengo auriculares electrostáticos Koss ESP/950 (~ $ 20,000mx), y escucho música de muy alta resolución: DSD256, que en mis auriculares Koss suenan más detallados que DSD128 en comparaciones A/B. Tenía bajas expectativas de un amplificador de potencia de Clase D, ya que leía que los AMP de Clase D eliminan las altas frecuencias en la música. Este amplificador de potencia A07 (<$ 2000mx) cuesta menos que incluso cualquiera de mis cables, la mayoría de los cuales son audiococitos. Mi DAC es un RME ADI-2 Pro (~ $ 46,000mx), que reproduce con precisión frecuencias de más de 90 kHz. Las mini maggies son precisas hasta aproximadamente 40 kHz. El Koss es preciso a aproximadamente 35 kHz. El Koss, conducido directamente del ADI-2 Pro, suena un poco mejor que las mini Maggies impulsadas por el A07. Cuando el DMA-200 espectral funcionaba, los Mini Maggies rivalizaron los auriculares Koss, pero la diferencia con el AMP A07 es increíblemente pequeña. Y como puede ver por las diferencias de precios, el A07 es realmente sorprendente. También quería mencionar cómo estoy alimentando el A07. Tengo un suministro de energía de laboratorio que estoy ejecutando en serie para duplicar el voltaje. He intentado de 30 V a 45V. Los Mini Maggies requieren mucha potencia, y son mejor conducidos por un amplificador de clase A como el DMA-200. Encuentro que conducir el A07 a 40+V da mejores resultados que a voltajes más bajos. La fuente de alimentación de 32 V/5A que vino con el A07 funciona muy bien, pero recomiendo una fuente de alimentación lineal de mayor voltaje para obtener mejores resultados.

This is an amplifier that punches way above its price range and size. It is well built and looks great. It has tested very well for its technical performance (see Audiosciencereview's test report) and that is reflected in its sound performance. I am using it to drive Elac 6.2 Debuts, and it has plenty of headroom that I will never need. And I am using the 32V 5A power supply option, which means I am barely powering it to just over half of the amplifier's output potential. The amp runs very cool when driving my Elac 6.2s. I am using a Schiit Modi 3+/Magni 3+ stack to feed the amp. To take the sound to the "next level", I tried several op amps including one that was recommended by an engineer at Aiyima in a paper called "The OP Chip Can Use on AIYIMA A04 & A07". Obviously I tried the NE5532 that comes with it. This sounds great as it is. I tried the LM4562NA. This offered some improvement. I did not leave this one in long enough to characterize it, only that the sound was "better". I tried the OPA1656, which I feel actually degraded the performance. The op amp that made a significant improvement is the OP275GPZ. This is one that is recommended by the manufacturer as an op amp that offers "Better resolution, low frequency and sound field than NE5532". I found this to be very much true. I think by "sound field" they mean "sound stage" as that really did open up. There is a clear improvement in resolution. I also found the treble to be more refined which was not expected from the description from Aiyima. And it also took "boxiness" out of the vocals. I don't know if the boxiness originated from the amp or my speakers, but the 275 cleaned up the vocals and they are now simply excellent. If op amps were free, I would try some others that the paper recommends. But given that they are not, and I feel I have hit on one that yields a big improvement, I am done searching. Any others will either most likely be a step back or just offer marginal additional improvement. This is a great amp as it ships. Since the input stage op amps are socketed, you have the opportunity to "roll" them to adjust the sound to your liking as I described above. For me, I found the 275 to be a phenomenal choice. Based on my experience, I highly recommend this amp!