Joined in 2023 
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63 About this deal
HiFi clear sound with tone control: resonable circuit and concise wiring,sounds warm and sweet without noise. Also with treble and bass knobs to adjust one's own preferable sound styles, presents HiFi music with rousing highs and deep lows.
EL2244: The timbre is neutral, the sound field is relatively wide, the high frequency is okay, and the mid-frequency music tastes poor. Some people say that the resolution is very high. In fact, it is because the low-frequency volume is less, the mid-frequency is thin, and the high-frequency is prominent. It is more difficult to use well.I totally agree that the Bluetooth side of things with the A07 Pro is phenomenal sounding. No need for op-amp swapping at all actually. I was really impressed. Their own THD measurements are about 0.0075%, roughly double or more compered with Fosi v3 ( 0.003%). Many companies decide to go with an op-amp they can buy in bulk for cheap. Then they design the circuit around the characteristics of that op-amp. Actually, most if not all do.
In discussing this with others, they agree that the Aiyima rep either is steeped in a language barrier issue. Or they just don't know enough to convey accurately. Listening at levels that are really too high for extended listening, the amp barely warmed up at all. The MiniDSP was warmer.Meaning, under certain conditions you can hear left channel audio over the right channel speakers and vice versa. This happens at louder volumes in every use case as some have reported. But even more so when paired with an amplifier that sums the left and right channel for LFE sub out use. Such is the case for users who pair the unit with a Fosi M-03 or an Aiyima A3001 sub amp to power passive subs or control active subs.
Great post! & great pics! Pop a temp gauge on your voltage regulators and see what they read. The community, I'm sure will benefit from and appreciate it. The temps of the regulators is the most important thing to observe. Because of what op-amps do... Those can heat up to much and fail. That's why I'm not going to be able to recommend the SparkosLabs for the A07 pro.
What is my opinion from the subjectivity of just listening to music?, I think it is a great product considering its price. I don't see the point in comparing it to the Aiyima a07 for two simple reasons, the first is that I don't have an a07, and the second is that I simply needed the addition of Bluetooth. I have no doubt that the a07 is a great product, but in this specific case it is not exactly what I needed. However, seeing the quality of this product, I will definitely buy an a07 which is useful to use in another office I have. DY639: The overallity is slightly weaker than DY649, but it has the characteristics of tube amplifier. NE5532: The resolution is average, the high frequency is relatively dry, and the low frequency is relatively muddy and fat.
This is the frequency response into 4ohm. Note the 50kHz LC filter cut-off visible in individual output branches. We don't know the type of potentiometer used (Taper A or linear) and the overall amp gain. Everything matters... In regards to sound, the BT20A Pro has more body or meat on its bones. It sounds more fluid and anchored, while the A07 Pro sounds airier and more precise. The A07 Pro’s soundstage is larger and more spacious with sharper imaging. The MAX volume is nicer than previous Aiyima Amps but linear on the V3 really nice and it is very subtle with lower volumes Strong output power and low frequency output: Adopted TPA3255 Chip,each channel can output 300W(4Ω), match perfectly and easily to drive all 3-8Ω passive speakers, adds a low frequency output easy to connect active speakers and build 2.1 channel system, the bass effects is greatly enhanced.But I also think that someone will find a combination of IC op-amps may prove to be, in their opinion, the end all-be all solution. Which can then be assessed by others. There's some improvements compered to the old A07 like better cooling, mono option, substantial speaker terminals and higher quality parts. Still not "perfect" or best in class IMHO. The Bluetooth part adopts imported Qualcomm QCC304X high-quality Bluetooth 5.2 receiving chip, which brings you low latency and supports SBC, AAC, APTX, APTX-HD lossless high-definition sound quality.， Overall it seams the A07 has the more flat and un-colored studio sound vs the TDA7498e has a bit of warmth/coloring with slightly less detail and slightly trailed off treble. The TDA7498e sounds more similar to older class A/B amps I have heard so some my prefer this. You didn't put a smiley face... You put a wink. These emoji's all have certain connotations and implications when used. They are all dependant on circumstances and sentiment.
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