I got AIYIMA A07 Premium and tested it.
It seems to produce less hiss on the speakers than AIYIMA A07. It also seems to have less channel imbalance than AIYIMA A07. Hiss was already inaudible at my listening position with A07, so the majority of audible difference comes from less channel imbalance.
Apart from that, AIYIMA A07 Premium has better passive cooling design, so it is more appropriate for summer. AIYIMA A07's passive cooler isn't thermally coupled with the case.
A man named douglas blake said he measured output impedance of AIYIMA A07 Premium. According to him, AIYIMA A07 Premium has lower output impedance than AIYIMA A07 and AIYIMA A07 Max. A07 Premium should have less load dependency on frequency response than A07 and A07 Max although it doesn't have PFFB. The lower an amplifier's output impedance goes, the less load dependency you are going to get on frequency response. This is called damping factor. I read higher damping factor reduces load dependency. I read that PFFB reduces load dependency by increasing damping factor.
My subjective listening experience was a bit better with A07 Premium probably because A07 has poor passive cooling design which affected capacitors a bit. In other words, A07 aged poorly over the last few years. A07 Premium also has higher-capacity capacitors, so it's going to sound a bit better than A07. But, it's not a day-and-night difference. The difference is subtle. I think the difference is that A07 Premium controls my speakers better than my aged A07. The audio sounds more tightly controlled. A07 Premium sounds more regimented. I mean it sounds cleaner.
I guess higher damping factor and better capacitors improve audio quality. Better passive cooling will help A07 Premium age better.
I think it's good enough for basic amplification inside a personal room.
It seems to produce less hiss on the speakers than AIYIMA A07. It also seems to have less channel imbalance than AIYIMA A07. Hiss was already inaudible at my listening position with A07, so the majority of audible difference comes from less channel imbalance.
Apart from that, AIYIMA A07 Premium has better passive cooling design, so it is more appropriate for summer. AIYIMA A07's passive cooler isn't thermally coupled with the case.
A man named douglas blake said he measured output impedance of AIYIMA A07 Premium. According to him, AIYIMA A07 Premium has lower output impedance than AIYIMA A07 and AIYIMA A07 Max. A07 Premium should have less load dependency on frequency response than A07 and A07 Max although it doesn't have PFFB. The lower an amplifier's output impedance goes, the less load dependency you are going to get on frequency response. This is called damping factor. I read higher damping factor reduces load dependency. I read that PFFB reduces load dependency by increasing damping factor.
My subjective listening experience was a bit better with A07 Premium probably because A07 has poor passive cooling design which affected capacitors a bit. In other words, A07 aged poorly over the last few years. A07 Premium also has higher-capacity capacitors, so it's going to sound a bit better than A07. But, it's not a day-and-night difference. The difference is subtle. I think the difference is that A07 Premium controls my speakers better than my aged A07. The audio sounds more tightly controlled. A07 Premium sounds more regimented. I mean it sounds cleaner.
I guess higher damping factor and better capacitors improve audio quality. Better passive cooling will help A07 Premium age better.
I think it's good enough for basic amplification inside a personal room.
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