With the trend of computers replacing traditional TV sets, more and more monitors are more than 32 inches in size. You should know that the size of TV sets was so large earlier. The reason for pursuing large screens is simply to experience the fun of watching movies through games. And it can't be said that there is no perfect sound without images, so many motherboard manufacturers saw this trend and began to build many motherboards with HiFi chips; Of course, this is the result of recent years; You should know that computer upgrading is fast, and replacing the motherboard means that a lot of hardware needs to be replaced. Obviously, for old players, many users are unwilling to touch these hardware casually. As a result, small decoding hardware such as external sound card appeared, but the effect was obviously determined by the sound unit - sound. The speaker manufacturers are not idle for this demand. Many users have paid attention to their own decoding desktop speakers once they came out. The sound engine A2+brought today is such a speaker with a decoding chip. I have experienced the A5+of Sonic Engine before, which gives me a good feeling and is a pleasant effect. Will the upgraded A2+of this acoustic engine A2 bring any surprises? Let's unveil it together.

Before the evaluation, let's take a look at the main parameters of this speaker:

Type: 2.0 active desktop speaker

Output power: 30W (15W rated power per channel)

Input interface: 3.5mm stereo, RCA, USB three-way input

Working voltage: 100-240V, 50/60Hz automatic switching

Amplifier type: Class AB amplifier

Speaker unit: 2.75-inch Kevlar bass, 20mm silk membrane dome tweeter

Signal to noise ratio:> 95dB (A-weighted)

Distortion:<0.05% (full power)

Crosstalk:< 50dB

Frequency response range: 65Hz-22KHz+/- 2dB

Sensitivity: 88dB SPL（ 1W@1m )

Input impedance: 10K ohm (unbalanced input)

Protection: output current limit, overheat protection, power switch transient protection

Size: 15x10x13.5cm each

Weight (left): 1.6Kg

Weight (right): 1.4Kg

Package weight: 4.6kg/pair

Package size: 26.7 × 38.1 × 17.8cm

Appearance: matte black, high gloss white

The packaging style and the consistent style of the continuation engine are rigorous and careful; The difference between accessories and the past is that a USB connection cable is adapted. Don't underestimate this cable. This is an important key to make your desktop speaker become a decoder. Of course, you can directly use a 3.5mm audio cable without decoding.

If you have known about Sonic Engine A5+before, your perception of Sonic Engine A2+should be "no difference in appearance". Yes, the design materials seem to be the same, but the size of the fuselage has been reduced several times.

The inverted hole of the acoustic engine A2+and the A5+maintain the same peculiar shape, which is generally circular or oval. The acoustic engine A2+adopts a long strip design, which looks very unusual, but the overall appearance is very harmonious. A2+uses 2.75-inch Kevlar fiber woofer and 20mm screen film tweeter. The rubber ring of its bass unit has excellent elasticity and excellent durability.

There is a fixing hole at the bottom just like the sound engine A5+, but this is used for fixing the base.

The back of A2+box is equipped with metal heat dissipation plate, which can provide better heat dissipation effect of internal circuit. On the heat dissipation plate, the wire is connected to the main and auxiliary boxes by means of wire clamping, and there are safety mechanisms such as output current limitation and overheat protection, which are not available for ordinary multimedia speakers; Although the size of the interface has been reduced, the interface is very complete. We can also see the RCA and 3.5mm audio input ports on the back of the main box, which are convenient for us to switch between various audio sources. RCA can be connected to subwoofer or additional speakers. Just connect A2+to your USB port or audio output port (headphone port), which can be a computer, mobile phone, walkman, iPod，iPad，PSP， It can be any audio device.

The terminal is made of pure copper, and the official introduction of the wiring method is drawing. Personally, I think it is not beautiful, but I prefer the wiring method with drawings. This is only a reference, and I decide on my own according to my preference and convenience.

Sound engine A2 was once one of the most popular products. Now, the new A2+not only inherits the excellent appearance and texture, but also upgrades the sound quality compared with the original A2. What are the specific improvements? Let's discuss it together;

Smaller volume, less than 2/3;

Lower energy consumption and higher efficiency;

USB input is added to the interface;

A2+adopts silk film tweeter+newly adjusted Kevlar woofer+high-performance decoder and amplifier+gold-plated connector+manually polished wooden box.

The biggest change is the A2+built-in USB sound card, which directly transmits the original digital signal from the computer through USB, and internally converts the digital signal into analog signal. Therefore, the audio quality obtained will not be restricted by the computer output.

In a word, A2+is comprehensively upgraded and improved from inside to outside compared with A2. go beyond.

In terms of sound creation, A2+uses the same silk film tweeter as A5+, which should be close in theory. A2+is also equipped with a newly adjusted Kevlar woofer, which makes its vibration frequency in the air more abundant, and the performance in the sound quality more exquisite and real.

Built in power amplifier: the power amplifier of the acoustic engine is placed in the left speaker, using the traditional full analog design. All components are tailored to make the system perform better and save more energy than passive speakers and independent power amplifiers. The circuit board of the power supply and preamplifier installed vertically can be mechanically shock proof to the greatest extent.

Shielding protection: both speaker units can shield high-frequency RF signals, allowing users to place speakers and screens close together. This shielding can also protect the hard disk digital music player.

Don't underestimate the A2+box design. In order to reduce unnecessary distortion and resonance, we used thick resin bonded MDF as the box material and strengthened the internal support. Fill the interior with high-strength sound-absorbing materials to reduce unnecessary sound reflection. The edges of the box are polished into rounded corners to reduce the sound diffraction caused by the treble on the front panel. The front of the box is installed with carefully adjusted phase inversion holes. Each speaker has been carefully adjusted, strictly tested and matched, so do not change the matching randomly for the best effect.

Talk about the voice of A2+; The 3.5mm connection mode is suitable for the connection with our external mobile phone tablet and player decoder. Let's start with the 3.5mm connection experience;

In terms of bass, A2+really has a certain shock ability. To be honest, as a desktop speaker, it really writes "Qu Cai", and the volume should not exceed 35%, otherwise Lao Wang next door will knock at the door... It can be used as a loudspeaker in a home theater. It's a bit far away. Let's continue to talk about bass. Low frequency diving has a certain depth, a sense of quantity, and is quite solid. In terms of style, it shows a rich tone. The tuning style is relatively modern, which is more suitable for listening to pop music.

The medium and high frequency performance, the medium and low frequency speakers bring a full and mellow sound, which is more imaginative than the A5+style, and can play a shocking role in the scene with a strong sense of atmosphere, such as the movie gunfight; Secondly, 20mm neodymium magnet wire film dome tweeter unit, high frequency clear and transparent, with good resolution of layers; When listening to some songs with more musical elements, you can clearly feel the beat of each note in your heart, and vocal reproduction is quite excellent!

After connecting the USB cable for internal decoding, the main performance is that the sound is more pure, the resolution and reduction are higher, the low-frequency diving is deeper, the sound is more mellow, and the modification of the sound can also make the sound sound more interesting, and also have more improvements, more suitable for various types of vocal performance. If it is a combination of computers, it is recommended to use the USB mode to get more pure sound.

The overall performance of Audioengine A2+speakers is relatively satisfactory, especially the sound in USB decoding mode gives another new sound experience; However, for desktop speakers, the sound is so shocking that there is a relatively large shock wave when the sound is too loud, which makes the small heart unbearable. This also shows that the functions of this speaker are far from limited to desktop computer speakers, and it can be used with home TV projector products to complement each other. Audioengine A2+is definitely one of the best ways to enjoy HiFi music without having to pay a lot of money to upgrade the motherboard. It is strongly recommended that users who intend to upgrade the motherboard listen to Audioengine A2+and make a decision.

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