I have just received an Aiyima A04, purchased directly from the manufacturer's website in the version with LM4562NA opamps. I already had a Mean Well LRS 150-24v power supply (regulated at 30v) and a very good Bludento HD bluetooth receiver to make a mini desktop liquid music system with little expense. At the bricocenter I took from the leftovers a plexy cutout, a 6mm aluminum tube and a 4mm threaded rod.
Opening the amp I noticed a good construction compared to the price of the product, with quality components where they are needed and golden tracks on the board. The heatsink is well fixed to the chip and with 30v of power supply it warms very little. There are no ventilation holes on the case, certainly no dust will enter even after years of use.
When I turned on the A04 for the first time, I noticed that, despite the card being the same Tilear 3.1 as some time ago, the gain was recently adjusted to a factor of 34x (30.6 dB), i.e. 0.6 v to bring the amp near maximum power (about 70W for my 30V-5A power supply). For me this is an optimal value for line level sources, as you can take advantage of the full stroke of the potentiometer to finally reach the limits of the amplifier. Squeezing more power out of this amp would mean redesigning and resizing everything, including the case. But then it would be another amp ... As it is, it's already great for me. The power is there and it is more than enough for home listening with normally efficient speakers. The delicate transparency in all registers, combined with a good microdynamics and a present and authoritative low range, make the sound very enjoyable at acceptable sound volumes in a condominium (0.5-3.0 W), even after many hours.
After placing the mini system in the self-built rack, there is the convenience of having everything at hand on the desk and controlling everything via laptop or telephone. If I want to move around the house, the reception of Bludento never fails, the connection occurs automatically every time I turn on the laptop or phone.
A receiver, an amp and music that I can stream from anywhere in the house via files or internet. Simplicity, convenience, good sound. What more can I want? ...
Opening the amp I noticed a good construction compared to the price of the product, with quality components where they are needed and golden tracks on the board. The heatsink is well fixed to the chip and with 30v of power supply it warms very little. There are no ventilation holes on the case, certainly no dust will enter even after years of use.
When I turned on the A04 for the first time, I noticed that, despite the card being the same Tilear 3.1 as some time ago, the gain was recently adjusted to a factor of 34x (30.6 dB), i.e. 0.6 v to bring the amp near maximum power (about 70W for my 30V-5A power supply). For me this is an optimal value for line level sources, as you can take advantage of the full stroke of the potentiometer to finally reach the limits of the amplifier. Squeezing more power out of this amp would mean redesigning and resizing everything, including the case. But then it would be another amp ... As it is, it's already great for me. The power is there and it is more than enough for home listening with normally efficient speakers. The delicate transparency in all registers, combined with a good microdynamics and a present and authoritative low range, make the sound very enjoyable at acceptable sound volumes in a condominium (0.5-3.0 W), even after many hours.
After placing the mini system in the self-built rack, there is the convenience of having everything at hand on the desk and controlling everything via laptop or telephone. If I want to move around the house, the reception of Bludento never fails, the connection occurs automatically every time I turn on the laptop or phone.
A receiver, an amp and music that I can stream from anywhere in the house via files or internet. Simplicity, convenience, good sound. What more can I want? ...
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