I'm a retired radio engineer, but I still do a fair bit of recording - live concerts, choral groups, voice over, some program production. I've wanted something decent for listening to recordings in an unused room at home. Not a lot of room available... I had a small amp that I bought from a supplier in Ohio, tried that, and didn't like the sound. It simply couldn't handle the transients at a moderately high level without breaking up. I can't afford the high end stuff...So I went looking and found this amp. Reading Bob P.'s review, I decided to take a chance. I'm glad that I did. The sound was significantly better than the previous amp, clearer, but not quite what I was looking for. I tried three pairs of speakers before I decided to use a pair of KEF C35 speakers. While the sound was good, it was just a little "off." "Boxy" was a good description. So I decided to do the suggest upgrade to the O275GPZ op amp chips, and ordered from a vendor here on Amazon. The cost was $26 and change for two Analog Devices chips (I avoid off brand chips) , but it made a world of difference. Well worth the extra money.The amp is easy to open (2.5mm hex key), and as noted the chips are socketed so easy to swap out. I was pleased to see that they are high-reliability sockets, not cheap ones.Files played through a 4th Generation Focusrite 2i2. Not Benchmark grade, but clean.

旧モデル（premiumではないA07）を気に入って使っておりました、システムとしてはDAC,SMSLDO400→TUBE-01J→　AIYIMA　A07（FXaudioのDCフィルター通す）です。　最近A07premiumが発売されていることに気付き、早速ポチってしまいました、そもそも、電源が３６V　４A（自前）→６A（付属品）に換えただけで低域の力強さが増しました（電源大切です、またDCフィルターも結構効きます）　旧版と比べるとボリュームカーブが違うのかもしれませんが、同じボリューム開度では新版は音量小さめです、しかし、全体の解像度は上がっており、また低域が豊かになっております、総じて評価するとお値段据え置き（たぶん）で音質アップは間違いないと思います。オペアンプも交換できるようですが、最近偽物が出回っているようで、信頼できるまともなオペアンプの入手が難しいようなので二の足を踏んでいるところです。いずれにしても、お値段もお安くA07premium大変良い出来です。他の方の比較評価も聞いてみたいものです。

I originally purchased the AIYIMA A07 in 2021, and it served me incredibly well for a variety of applications. After using it for several years and loving the sound quality and performance, I recently decided to purchase another one in August 2024. It’s a testament to how much I enjoyed my first A07.The build quality is fantastic, and the compact design makes it easy to fit into any setup. The sound quality is outstanding—clean, natural, and full-bodied. The bass is tight and well-controlled, the mids are clear and detailed, and the highs are crisp without being harsh. It's the perfect balance of performance and affordability.Whether you're using it for a small desktop setup or a larger home audio system, the A07 provides plenty of power, and it sounds amazing. If you’re looking for an affordable amplifier that delivers exceptional sound, I highly recommend the AIYIMA A07. You won't be disappointed!

デフォルトのオペアンプは、NE5532Pですが、簡単に他のオペアンプと交換可能です。OPA627AUと後継のOPA828と聴き比べしてみたのですが、高速、低ノイズで低中域がスッキリした感じがするので、個人的にはOPA828が好みです。セールで購入出来れば、AC/DCアダプタ分でお得感があります。AliexpressのAiyimaストアでは別々に買えるのですがアダプタは値下がらないので、A07だけの単体購入ならアリで買った方が安いですね。

This is the third Class D cheapy amp I've bought. The earlier 2 were the Fosi BT30E and the Sabaj A10a (1st gen). The Fosi sounded 'harsh' on some tracks I played. So I bought the MA12070 Sabaj A10a which had a warmer sound.I'm running Elac Debut B6 (not 6.2). I also have an old Sony 12" subwoofer that I sometimes turn on. But only for booms or doof; not for normal listening/watching TV. The Elacs go deep enough for most purposes.The earlier amps had features I thought were critical; remote control, tone/bass/EQ controls, dedicated sub out. They also had some other features I didn't really need, eg Bluetooth, sub crossover (sub can do that) etc.But I've thrown all that out for the pure, balanced, sound quality (to my ears) of the A07. I've tested to the best of my ability using basic sound meter testing to ensure equal volumes and A/B switching. And even tried many, many permutations of settings for the Fosi and Sabaj. But no matter what settings I choose for the other amps, when I switch to the A07, which only has on/off, it sounds better to my ears.Also, I was pleasantly surprised that the 3.5mm aux on the A07 can be used as an active sub out. I thought I'd have to daisy chain from amp to sub to speakers, but instead, I can use the much tidier amp to speakers + amp (aux) to sub.So, the A07 is it for now. I don't need the tone/balance/EQ, and I can work around remote controls via using independent volume controls and a POOSR 4 Channel Stereo Audio Mixer.TLDR: If you are looking at other amps around this price range, don't hesitate. Give the A07 a go.

The AIYIMA A07 TPA3255 Power Amplifier is a Class D stereo digital audio amplifier designed for home theater systems and high-fidelity audio enthusiasts. With its powerful performance and sleek design, it aims to deliver an immersive and superior audio experience. In this review, we will delve into its features, sound quality, build quality, and overall performance.One of the standout features of the AIYIMA A07 is its utilization of the TPA3255 amplifier chip, which is renowned for its high efficiency and low distortion. This chip enables the amplifier to deliver a remarkable power output of 300W per channel, ensuring ample headroom for driving a wide range of speakers with ease. The inclusion of Class D technology further enhances its efficiency, resulting in minimal power wastage and reduced heat generation.In terms of sound quality, the AIYIMA A07 truly shines. The TPA3255 chip's inherent characteristics contribute to a clean and transparent audio reproduction, providing a detailed and accurate sonic performance. The amplifier excels in delivering a wide frequency response and excellent dynamic range, allowing for an engaging and immersive listening experience. Whether you're watching movies, enjoying music, or gaming, the AIYIMA A07 ensures that every nuance and subtlety of the audio is faithfully reproduced.The build quality of the AIYIMA A07 is impressive, with a sturdy and robust construction that exudes durability. The amplifier features a sleek and minimalistic design, blending seamlessly into any home theater setup. The front panel hosts a power button and a volume knob, offering convenient control over the audio output. Additionally, the rear panel provides a comprehensive array of connectivity options, including RCA inputs, 3.5mm auxiliary input, and speaker terminals, allowing for flexible integration into various audio systems.Furthermore, the AIYIMA A07 incorporates a range of protection features to safeguard against potential damage, such as over-temperature, over-voltage, and short circuit protection. These measures ensure the longevity of the amplifier and provide peace of mind for users.In terms of performance, the AIYIMA A07 delivers on its promises. The amplifier exhibits excellent channel separation, providing a well-defined stereo image. It effortlessly handles demanding audio passages, maintaining clarity and precision even at high volumes. The low distortion levels and low signal-to-noise ratio further contribute to its commendable performance.However, it's worth noting that the AIYIMA A07 does not include any digital inputs or built-in DAC (Digital-to-Analog Converter), limiting its compatibility with digital audio sources. To utilize this amplifier with digital sources, an external DAC or audio interface would be required.In conclusion, the AIYIMA A07 TPA3255 Power Amplifier is an exceptional choice for those seeking a high-performance stereo amplifier for their home theater system or audio setup. With its powerful output, clean sound reproduction, solid build quality, and comprehensive protection features, it offers an excellent value proposition. Although it lacks digital inputs, its remarkable performance, reliability, and affordability make it a compelling option for audio enthusiasts.

I held-off on writing a review until I had an opportunity to spend some time listening with this amp. It’s been 2-months now and I remain shocked by its performance. I had a tube amp retailing for over $2200 CDN which had an issue with a tube. While sorting this out, I decided to buy (my wife ordered it for me) the A07 based on all of the glowing reviews (Audio Science Review, Cheapaudioman) and as a bit of fun given its small price. The bottom-line is simple: this is not just an insanely good amp for the money, it is an insanely good amp. I use it with a Musical Paradise MP-D1 Mk.3 DAC (discontinued), Audiolab 6000 CD transport and, for speakers, rotate the KEF LS50 Meta and the Lii F-15 full range driver in an open baffle (no crossover). With these set-ups I made A/B comparisons with (I won’t get into mentioning brand names and models) a 4-yr old $1,400 CDN integrated amp-dac (Class A pre-amp section, Class D power) and a out-of-the box new very popular $3,600 CDN class A/B ‘all in one amp’ that I just bought (and later returned). Based on sound alone (overall tonal quality, detail, imaging, bass control…), the MP-D1 + A07 combination was superior. After every listening session I was in disbelief…this just cannot be right! Next listening session, my doubts were re-extinguished and I was rendered amazed. Unlike cheap class D amps that I have heard, I would describe the A07 on the warm side of neutral and vocals were incredibly well produced with no harshness. This is with the stock NE5532 op amp. I have no idea if op amp rolling would pay-off, but I plan on trying a few. As it stands, the A07 is now my main amp. I was also surprised by how it handles the fairly hard to drive LS50 meta…no issues at all. The claimed power rating of 300 W (or whatever is it) is just plain silly. I agree with ASR review of the A07: we’re talking around 60 – 70 watts/ch of clean power. Not surprisingly, at this silly price, there are some downsides. One, the speaker binding post layout is cramped making connections with some types of cables challenging. Two, the grounding circuitry is not great. You can hear hum from the speakers when not playing music (not audible when you are) which I suspect is a grounding issue as if you touch the amp case, the level of the hum drops dramatically. But apart from these issues, the unit is very solid and runs cool. The future of audio looks bright for consumers as these new generations of Class D amplifiers (the A07 uses the Texas Instruments TPA 3255) are inexpensive (compared to quality tube amps and proper class A) and truly sound great.

This is an amplifier that punches way above its price range and size. It is well built and looks great. It has tested very well for its technical performance (see Audiosciencereview's test report) and that is reflected in its sound performance. I am using it to drive Elac 6.2 Debuts, and it has plenty of headroom that I will never need. And I am using the 32V 5A power supply option, which means I am barely powering it to just over half of the amplifier's output potential.The amp runs very cool when driving my Elac 6.2s. I am using a Schiit Modi 3+/Magni 3+ stack to feed the amp.To take the sound to the "next level", I tried several op amps including one that was recommended by an engineer at Aiyima in a paper called "The OP Chip Can Use on AIYIMA A04 & A07". Obviously I tried the NE5532 that comes with it. This sounds great as it is. I tried the LM4562NA. This offered some improvement. I did not leave this one in long enough to characterize it, only that the sound was "better". I tried the OPA1656, which I feel actually degraded the performance. The op amp that made a significant improvement is the OP275GPZ. This is one that is recommended by the manufacturer as an op amp that offers "Better resolution, low frequency and sound field than NE5532". I found this to be very much true. I think by "sound field" they mean "sound stage" as that really did open up. There is a clear improvement in resolution. I also found the treble to be more refined which was not expected from the description from Aiyima. And it also took "boxiness" out of the vocals. I don't know if the boxiness originated from the amp or my speakers, but the 275 cleaned up the vocals and they are now simply excellent. If op amps were free, I would try some others that the paper recommends. But given that they are not, and I feel I have hit on one that yields a big improvement, I am done searching. Any others will either most likely be a step back or just offer marginal additional improvement.This is a great amp as it ships. Since the input stage op amps are socketed, you have the opportunity to "roll" them to adjust the sound to your liking as I described above. For me, I found the 275 to be a phenomenal choice.Based on my experience, I highly recommend this amp!