AIYIMA A07MAX 300Wx2 Class D TPA3255 HiFi Mini Mono/Stereo Amplifier

Having grown up with hi-fi amplifiers being large and heavy, even for modest power outputs, this tiny amplifier is amazing. It is very powerful and sounds very clear with plenty of punch through my Mission speakers. It uses the Class-D principle, which has been theoretically possible for many decades, but very difficult to make a practical working design. Texas Instruments have pioneered Class-D amplifier integrated circuits, and this amplifier unit utilises one of their best chip designs. Although the unit is very small and quite basic - just a volume control on the front - the sound quality and power you get for a such a low cost is incredible.

At this price point I want expecting much and I was very pleasantly surprised. I'm using a Wiim Mini streaming Tidal paired with Wharfdale diamond 9.1 speakers. The sound is accurate and clear. Bass is decent and it can fill a small room. It's a smart uncomplicated little box with solid banana connections for the speakers and a simple on off volume. Love it.

Compact, but gets slightly warm even with delivering circa 100W into 8 ohm. Currently using a 48V PSU, as the 32V is too quiet. I was expecting a louder volume with the amp bridged, but as the supply is on +48V and not +/- 48V, the only advantage bridged is when driving more speakers in parallel. Would recommend trying the amp with a pre-amp, as no clipping even on max volume. For price, size and sound, well worth it. Just a note for others, by going from a 36V supply to a 48V supply you can double the available power as power equals (V*V)/R. Just make sure your 48V supply can deliver at least 7-8 amps, otherwise it will cut out if only rated at 5 Amps as you get close to limit. If driving into 4 Ohm speaker then a 36V 10 amp supply should be fine.

Bought this largely on the strength of the recent Audiosciencereview. I'm driving mine from a pre amp and can control the balance remotely . I believe Amir was less happy with the integrated balance due to the on board pot'. I've not got 'Golden Ears' but to me the sound quality is very good considering the price point. Be aware there's no trigger in remote feature which for some (myself included) might be an issue. Still great value for money, my recommendation.

Lots of positive reviews of the A07Max here and I concur but one feature that I must have is headphone connection. The amp does not have this. I am glad that it is possible to connect a Bluetooth transmitter plugged into the Aux output at the back. Turn down the main Volume knob as this has no effect on the Aux. Actually there is no need to turn the amplifier on at all! Any source (tuner, cd, turntable not needing phono stage, etc) plugged into the amp can be heard through Bluetooth headphone without turning on the amp. Now I am happy (and my good lady too) enjoying the amp using my headphone.

I desperately want to get a second one to bi-amp my small hifi system but can't afford to at the moment, so much has been written about the sonic abilities of this amp but I can confirm everything positive written. I use it as a power amp as volume is controlled via my preamplifier, absolutely faultless can't wait to get my second one real soon hopefully, highly recommended.

Compact and easy to use. Just the stereo input and output with simple speaker outputs and a single volume control. Presently have this connected to a pair of Kef Egg speakers for “quiet” listening and the sound is very good, however, there is no way this amp produces 300 watts. The output is closer to 7.5 watts. As an experiment I have tried this with 3 other pairs of speakers, Monitor Audio, Yamaha and Wharfedale and this amplifier struggled. Either I have a faulty unit or the way the wattage is measured is in error. In my youth I was a singer and used a 100 watt PA system and was often asked to “turn it down a bit”. Back then in the 1970s 100 watts into a pair of 200 watt PA speakers was loud and rarely needed more than half volume. This nebulous modern manner of describing amplifier output is in my opinion dishonest and should be discouraged. What is wrong with stating the actual output in actual watts. Perhaps decades of listening to very loud music has caused very damaged hearing requiring hugely inflated output figures. If this amplifier had been accurately described with regard to its output it would be incredibly useful in my system as all I want is a simple power amplifier that takes sound from my mixer and amplifies it. In other words “Keep It Simple”. Update, 30 Oct 2024: Despite earlier misgivings, I now have 2 of these amplifiers and am about to buy a third one. I have been rearranging and further rearranging my study for some weeks and have made discoveries galore about these little amps. I still don't know how the makers come up with their 300/600watt power output, they did try to explain it to me but it was beyond my understanding, however, my very clever younger electronical engineer graduate brother told me that on this type of amp it has to do with the amount of power you put into it and the resistance of the loudspeakers. So I gave it more power and used lower resistance speakers and wham bam thank you mam, I have the sound I want. No bleurgh-tooth on these which is great because I have never got it to work, ever. Then there is the daisy chain facility, these have a stereo RCA input and a mini stereo jack Aux output...so, I plug an output lead into the RCA input into an second amp, then I can go from the second to a third and so on...each amp will pun a pair of speakers, so three amps give me 6 (3 pairs of) speakers...so I can combine the dynamics of my Wharfedale 10.1, Yamaha and Kef speakers into quite a pleasurable (well, to me it is) sound. The Wharfedales have an amazing bass sound so no subs needed here...I don't like wooly woofy bass, so the hard Kevlar cones on the Wharfedales are spot on for me, with the addition of 'bungs' in these speakers. All controlled via an Omnitronic PM444 usb mixer. It has taken a while to get there and a lot of tweaking plus the addition of good quality cables to get it sounding right and a fair bit of cartridge experimentation as well.

Plenty of power on hand here with the AO7 Max. Very well made Class D. Straight out of the box the amp sounds great, fairly balanced with good vocal presence and will probably .satisfy most people’s expectations.

Qué se puede decir de este Aiyima A07 que no se haya dicho ya en tantos videos que se han publicado? Sonido excelente, precio justo; no se calienta, no mete ruido; viene con una fuente de poder de 36 volts (los modelos parecidos de la misma marca y de la competencia como Fosi Audio y Douk Audio traen la fuente de 32 volts) ¿Eso importa? pues según los datos que publican las tres marcas mencionadas, el cambio de fuente de poder implica un aumento promedio de 25 a 30 whats, y si tomamos en cuenta que la fuente poder de 48 volts que vende Douk Audio por separado cuestas más de 80 dólares; pues el A07 tiene una pequeña ventaja sobre la competencia.

Todo de metal da una imagen de solidez y calidad. La calidad de audio es muy buena

Le Aiyima A07 MAX est le dernier né des amplis à base de puce TPA3255 qui sont dernièrement très à la mode en raison de leur rapport puissance prix très favorable. Le A07 MAX est simple mais bien conçu, il dispose de gros borniers permettant de passer du câble d’enceinte de bon diamètre ou alors encore plus pratique, des fiches bananes. Il ne dispose que d’une entrée RCA simple, il vous faudra donc idéalement ajouter un DAC pour le brancher directement sur votre ordinateur et ainsi bénéficier de ses grandes qualités. L’installation est très simple, il est doté d’un bloc d’alimentation de 36 volts. Il peut également être équipé de blocs plus costauds jusqu’à 48 volts pour une puissance supplémentaire au prix d’un dégagement de chaleur plus élevé. L’ampli est à ce niveau bien conçu car équipé de petits trous permettant une meilleure dissipation de la chaleur. En utilisation et avec l’alimentation de 36 volts, l’amplificateur reste tiède. Il dispose également d’une line-out en mini-jack pour y relier un caisson de grave actif. L’allumage de l’ampli se fait par rotation d’un gros potentiomètre en façade, rien de plus simple. Détail intéressant pour les plus techniciens d’entre nous les op-amps sont remplaçables selon le désir de l’utilisateur, un détail sympathique pour les puristes. En l’état le son qui sort de cet amplificateur est remarquable, avec un rendu des percussions que je n’avais jusque-là jamais entendu sur aucun amplificateur chinois, les impacts sont époustouflants et transfigurent les enregistrements. La puissance développée par l’amplificateur est suffisante pour la plupart des enceintes et impressionnante par rapport à la taille minuscule de l’appareil. Un très bon appareil.

I purchased a pair of the Aiyima A07 Max amplifiers for use with a WiiM Ultra control preamplifier. The A07 Max amplifiers performed well with the WiiM Ultra control preamplifier using the line out from the WiiM Ultra. I compared this combination with the WiiM Amp Pro. The WiiM Amp, WiiM Amp Pro and WIIM Vibelink Amp each support digital optical input, that is how I prefer to listen to music via the WiiM Ultra to the WiiM Amp Pro versus the line out/line in (RCA) connection. The Aiyima A07 Max does not provide an optical input, only one pair of L/R RCA connections. The Aiyima A07 Max can be set to stereo mode or mono mode. You can start out with a single A07 Max amplifier set for stereo mode. You later can add a second A07 Max amplifier, set both A07 Max amplifiers for mono mode in a two channel system. Mono mode can provide increased channel separation. Using two amplifiers in mono mode unburdens a single power supply from having to supply power to both channels while maximizing dynamic headroom. As excerpted from the A07 Max owner's manual maximum rated power with the included 36V/6A power supply (in stereo mode) is: 107 Watts x 2 channels @ 4ohms, 100Wx2@6ohms, 94Wx2@8ohms. (In mono mode) the maximum power rises to 190 Watts x 1 channel @ 4 ohms, 150Wx1@6ohms, 118Wx1@8ohms. A single Aiyima A07 Max amplifier in stereo mode provides very engaging, dynamic sound. I actually prefer the sound of a single A07 Max amplifier versus a pair of A07 Max amplifiers set to mono mode for some music. In stereo mode the input sensitivity of the A07 Max is ~3dB higher than in mono mode. The damping factor, not stated, will be reduced by half in mono mode. To be sure, in mono mode, the channel separation is improved, the midrange frequencies come through with better instrument and vocal definition than in stereo mode. Still, in stereo mode the A07 Max draws me in with its very punchy, musical bass performance; The Allman Brothers Band sounds great when using a single A07 Max amplifier in stereo mode. In comparison , a pair of A07 Max amplifiers in mono mode sound more refined but not as ready to rock. A single A07 Max amplifier is a great way to start listening. You can always add a second A07 Max amplifier. The A07 Max amplifier has no tone controls. I prefer to use the WiiM Home app's equalizer functions (both graphic and parametric equalizers are included) rather than conventional bass and treble tone controls. The volume knob on the front of the A07 Max is also the power switch. There are two blue LEDs on the front of the A07 Max. One LED is on the left and the other LED is on the right side of the volume control. These LEDs indicate whether the amplifier is set for stereo mode or mono mode. There is a recessed Stereo/Mono mode switch on the bottom of the A07 Max. Among the small, inexpensive Class D amplifiers the Aiyima A07 Max is noteworthy for being able to be switched between stereo mode (BTL) and mono mode (PBTL). [Update 8/31/25: In attempting to connect a Fosi Audio P2 headphone amplifier using the A07 Max amplifier's 3.5mm Aux Out connection I discovered that the A07 Max amplifier must be turned on; the A07 Max amplifier's volume control affects the Aux Out signal level. The audio output level of the speakers was greatly reduced when I connected a 3.5mm stereo audio cable from the Aux Out on the A07 Max to the Fosi Audio P2 headphone amplifier. I did not test connecting the A07 Max amplifier to a powered subwoofer but the speaker audio level may also be reduced when you connect the A07 Max amplifier to a powered subwoofer via the Aux Out.] I found the A07 Max sounded better when set to mono mode, including bass extension and tightness of the bass notes. In mono mode, in addition to having to connect one pair of speaker wires to the binding posts labeled "+ Mono Mode -" you need to connect one channel of a typical dual RCA cable to the A07 Max's RCA white colored connector that is labeled "L". If you accidently connect the RCA cable connector to the red RCA connector that is labeled "R" you won't get any audio output from the A07 Max amplifier. Compared to some other small amplifiers, the speaker binding posts on the A07 Max are a bit larger (but still made of plastic and metal, not all metal) and are staggered with the lower connectors shifted slightly to the right for easier access. I recommend using banana plugs to connect the speaker wires. I use the Sewell deadbolt banana plugs (sold on Amazon.) While some have reported that the 3.5mm Aux Out connection on the A07 Max amplifier is a pass through from the RCA inputs terminals and that the Aux Out level is not controlled by the volume control on the A07 Max I found this to not be the case (see my update of 8/31/25). For connecting to a powered subwoofer I use the WiiM Ultra's single RCA subwoofer output connection. A key differentiator between a two channel audio system based around the WiiM Ultra with a one or a pair of Class D amplifiers (such as the A07 Max) versus using just the WiiM Amp or WiiM Amp Pro is that there is no upgrade path with the WiiM Amp/WiiM Amp Pro that does not involve replacing the WiiM amplifier unit with another amplifier unit. [Update: WiiM has introduced the WiiM Vibelink Amp as the matching amplifier for the WiiM Ultra. You could start out with or upgrade to the WiiM Vibelink Amp from the WiiM Amp/WiiM Amp Pro for ~3db more headroom and maximum power (100WX2@8ohms/200WX2@4ohms) when using the optical connection.] From a cost/value perspective a single Aiyima A07 Max amplifier (or a pair of A07 Max amplifiers used in Mono mode) are a viable alternative to one of the WiiM amplifiers. The maximum available power from the WiiM Ultra/A07 Max combination can be increased by adding a second A07 Max unit (while retaining the original A07 Max), in mono mode. You can maximize available amplifier power of the A07 Max by upgrading the power supply. Should you require maximum power from the A07 Max amplifier you can substitute a 48V/10A power supply for the standard 36V/6A power supply. In dual mono mode, a pair of A07 Max amplifiers set to mono mode and a pair of Aiyima brand GaN 48V/10A power supply units (sold on Amazon), each A07 Max amplifier unit can then provide (315Wx1@4ohms, 240Wx1@6ohms, 190Wx1@8ohms). This is significantly more power, (3dB or more headroom and available power @ 4 and 6 ohms) than the advertised maximum rated power of the WiiM Amp or WiiM Amp Pro (60Wx2@8ohms, 120Wx2@4ohms). I measured the temperature of the case of the A07 Max amplifier when using the stock 36V/6A power supply while powered on, while in use. The case temperature was 82F in standby. [It is now July. The room temperature is ~78/79F. The case temperatures of the two A07 Max amplifiers (stacked with the stock power supplies) while actively powering speakers are running ~98 to 100F, warmer than in previous months but not a concern. The WiiM Vibelink Amp, sitting beneath the two A07 Max amplifiers, is in standby with a case temperature of ~95F.] In comparison the earlier temperature readings this spring of the case of the WiiM Amp: 76F, WiiM Amp Pro: 79F, WiiM Ultra: 76F, WiiM Mini: 79F. In comparison the temperature of the case of the Fosi Audio TB10D amplifier with the stock 32V/5A power supply measured 72F. The cooler the better, for longevity. [Update: I measured the standby power consumption of the A07 Max amplifier. Plugged in, switched off, the power consumption measured 0.1 Watt. Powered on, no input signal, the power consumption measured 4.3 Watts. This measurement was for one A07 Max amplifier in either stereo mode or mono mode. A pair of A07 Max amplifiers switched on, with no signal, consume 8.6 Watts. I enjoy listening to the Aiyima A07 Max amplifier powering a pair of Saiyin DS6700M Passive Bookshelf Speakers. The Saiyin DS6700M is a small 2-way passive speaker with a 3.5" woofer & silk Horn tweeter, sold on Amazon. See my separate review of the Saiyin DS6700 speakers.]

É razoável em termos de áudio isto é, não é ruim, mas não tem pressão sonora que possa empurrar caixas um pouquinho mais exigentes, como, por exemplo, as Polk Signature ES 20. Não entendo como alguém pode dizer que o áudio desta amplificador posso agradar audiófilos. Não sou chato que procura ouvir o sussurar das formigas e nem zumbido de anjos em nenhuma melodia ,mas definitivamente este equipamento carece de impacto para reproduzir música em alta fidelidade. Já começa tudo errado, pois o botão do potenciômetro não gera audio audível até 1/4 de sua revolução.