Aiyima A70 Power amplifier for High End speakers

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www.aiyima.com/
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Greetings, dear friends. My name is Arkady Zenin, and I am the founder of PremiumHIFI. Thanks to the arrival of the AIYIMA A-Seventy, you no longer need to buy expensive, branded Class A/B amplifiers for one thousand euros to get good HI-FI sound. You can spend five to seven times less money and get sound comparable to that of famous brands. Don’t believe it? Come to our PremiumHIFI studio in Riga, and you can listen and compare for yourself. We provide sound solutions for any space!
The stated maximum power, as always, is exaggerated: two by three hundred watts at an eight-ohm load. Even with a ten-ohm, forty-eight-volt power supply, that’s impossible! But this time, the manufacturers posted a correct table of power and distortion on their website. You can check it out via the link in the description.
What do you think? Can a budget amplifier really compete with expensive brands? Write your thoughts in the comments!
The AIYIMA A-Seventy can be ordered with two power supply options: forty-eight volts, five amps, and forty-eight volts, ten amps. Here at PremiumHIFI, we tested the forty-eight-volt, five-amp option. The power supply is unique. It’s made using GaN (Gallium Nitride) Power Adapter technology, which is an innovative charger that uses gallium nitride instead of traditional silicon. This makes GaN chargers more compact and efficient. They generate less heat, increasing their reliability and lifespan. GaN chargers can provide higher power, allowing faster charging of devices such as smartphones, tablets, and laptops. Their compact size makes them convenient for travel.
However, compared to the compact amplifier case, the power supply can’t be called compact. When I first connected this amplifier, I was ready to hear the sound of a Chinese radio from the Soviet market, but no, it really surprised me and delighted my neighbors with powerful sound!
The amplifier sounds quite mature despite its compact size. I’ll talk about the sound a bit later. The vertical metal case has rounded corners, ventilation holes on the sides and bottom. On the front, in the center, there’s a volume control, and a short press turns on the amplifier and switches between RCA and XLR inputs. A long press turns the device off. Below the multi-selector are dim, subtle LEDs for the selected input. It looks very attractive and elegant. The build quality is impeccable despite the modest price of one hundred and seventy dollars, excluding the power supply, at the time of preparing this review.
On the back, there are XLR and RCA connectors for connecting one or two sources. The RCA input boasts a sensitivity adjustment of plus or minus three decibels, which is convenient when connecting a portable source with low output power. It could also be a streamer, cassette deck, reel-to-reel tape recorder, turntable with a built-in phono preamp, or any other quality source. You can also connect to the XLR input using a six-point-three-five millimeter jack. The presence of an XLR interface allows the amplifier to be used not only at home but also in a studio, for example.
There’s an adjustable RCA output for connecting one active subwoofer (which is very unusual for a power amplifier and not typically found in classic branded HI-FI), inexpensive terminals for connecting speakers. Of interest is a twelve-volt trigger input, allowing your source or DAC to serve as a remote control for turning the amplifier on and off.
Inside, there’s an American TPA3255 amplification chip from the American company Texas Instruments, known for its innovations in the development of Class D amplifiers. And if we look at the chip’s data sheet, it indeed delivers more than three hundred and fifteen watts per channel at a four-ohm load, provided there’s a sufficient power supply. However, there’s a nuance: after one hundred watts of power, the chip falls into distortion exceeding ten percent with an eight-ohm load (red line on the graph). Hence the conclusion: even a five-amp power supply is optimal for quality sound when connected to eight-ohm speakers. And it’s better if the speakers are four-ohm, with less distortion at maximum power (black line on the graph), and then you can opt for the ten-amp power supply.

[@PremiumHIFIworld]

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✅ Aliexpress A70: s.click.aliexpress.com/e/_DDhL1MR
✅ AMZN T1 PRO: amzn.to/4dLXOpf
✅ AMZN A70 PRO: amzn.to/3WIXmkx
www.aiyima.com/

[@MaZEEZaM]

I want to buy small amplifiers like this but it doesn't have any digital inputs or outputs. Unless I'm watching a blu-ray via my Blu-ray player, my source is my pc via HDMI and USB C for my earphones and I intend to buy and apple TV 4K which would also use HDMI. These amps have neither of these connections, not even headphone out to plug IEM's or headphones directly.

[@GP-yx3dn]

You need a DAC.

[@scrunts666]

I heard one, it is crap.