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To level the playing field, I adjusted the Aiyima A07's volume to 50% and the BT20A Pro's to around 75% until they sounded equally loud.
But even more so when paired with an amplifier that sums the left and right channel for LFE sub out use. But here's where it gets tricky – if you assume the same scale for the volume knob, you're in for a surprise. The power supplies used for this test just aren't beefy enough for the chip to perform to its potential. Test of AIYIMA A07 by Audio Science Review " These TPA3255 based amps seem to have good bones in them, producing above average performance for peanuts. Suite à mon premier avis (plutôt sévère) sur l'a07 MAX, j'ai le devoir de poster un nouvel avis, car après une soixantaine d'heures d'utilisation, mon A07 MAX a sensiblement évolué, preuve que le rodage des électroniques n'est pas une lubie d'audiophile mais un phénomène bien réel particulièrement en ce qui concerne les condensateurs de qualité.Compatible with a variety of op amp chips:A07 amplifier has a rich midrange,If you want to replace the NE5532 chip and experience a different sound, you can replace op amp chips: OPA2604, OPA2134, LM4562, JRC5532, etc.
Focus on Bluetooth digital amplifiers, tube amplifiers, preamplifiers, headphone amplifiers, DAC audio and other HiFi audio equipment. At the end of the day, if you need a power amplifier with a ridiculous amount of power, Bluetooth and RCA inputs, good EQ wheels, and with a solid build quality, and which looks very good in person, AIYIMA A07 PRO is an excellent choice and an amplifier I really enjoy a lot. The mono capability would seem to me to be most useful to people with a medium sized listening space with medium to high efficiency speakers who want to use the 48v power supply option to get medium to loud volume levels. If you have speakers that are so hard to drive that they would need this kind of power, you likely know what you want and will have a higher end power amplifier, and if you have the kind of entry-level speakers that this amp is likely to get paired with, you will notice that you can mainly only use the first portion of the volume potentiometer.They also appreciate the clear timbres, silky sound, and the ease with which it can drive 6 ohm speakers. In the fine print, you can see that this power is supported with an aftermarket AC/DC adapter, and since I found the technical data on the page of a very similar product, the actual driving power is lower. This being said, compared to AMPs that have the same Class D design with the TPA3255D2 Class D AMP Chip, and NE5532 Dual OP-AMPs, the sound at default is similar, you need some kind of EQ to bring more bass and treble in the sound to make it all worth it. During a visit to a friend's place, I had the opportunity to experience the heat dissipation from a Class AB amplifier.
Is there anything else that can be done such as input cap, or any other caps; output inductors, what would you upgrade to? But recently one of their competitors (Fosi Audio) went "back to basics" with their design for the Fosi Audio V3 - not adding "features" but using higher quality components, a new orientation of the amplifier board and better cooling to provide a high quality alternative to Aiyima TPA3255 products. To test the limits of A07 PRO, I turned the DAC to -42dB, and turned the AIYIMA A07 PRO all the way to the max. One thing to note is that the power adapter is incredibly large, bigger than the unit itself, and is quoted for 36V – 6.The "A07MAX Mono Channel Correct Connection Method" on the Aiyima web site suggests both channels are in use but it is difficult to visualise how a simple slide switch (or toggle switch in the Fosi ZA3) can make the necessary changes in circuit configuration.
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