For the Avantgarde XA series before and after the level should not be unfamiliar, in recent developments, the 2012 Kaohsiung audio show general agent Shengqi held at the end of March made Taiwan's first exhibition (see here for detailed reports). To be farther away, Holger Fromme, president of Avantgarde, who came to Taiwan to participate in the "Taipei International Hi-End Audio Exhibition" in November 2010, has revealed that this prototype has been voiced in his office (see here). . In fact, Avantgarde's XA level can be said to be one of the most important products of the factory in recent years. It has been spent many years before and after research and development. Last year (2011), the German Munich Audio Show was only on display. The prototype, the "2012 Munich Munich Audio Show", which just ended successfully at the beginning of the month, is the moment when the XA is really big and big. Perhaps, some readers will be puzzled that Avantgarde will launch an expansion machine - is Avantgarde not a well-known professional horn loudspeaker brand?
In fact, friends who know more about Avantgarde will know that this is not the first time the factory has launched an expansion machine. They have previously produced two models, Model Three and Model Five, and One Control and One Power. Grade and other expanded machine products. Why does Avantgarde launch its own brand of expansion machine? In fact, in the Hi-End audio industry, there is no shortage of speakers to launch expansion machines, and even continue to develop a full range of products, some of which are because their own speakers have been criticized for not being able to drive, so the extension of the "demonstration" of the expansion machine should be good. Sound performance. However, the Avantgarde, which has a high vocal efficiency, is not too difficult to drive. On the contrary, it is too precise and sensitive to become an "expansion machine killer". It is easy to expose the shortcomings of the expansion machine one by one. This is Avantgarde was forced to make a reason for a quality amplifier.
The main focus of the launch of the XA series is the elimination of crossover distortion, the purification of power supply, and the distortion caused by the vibration of electronic components. After that, Avantgarde finally launched the epoch-making pre- and post-level masterpieces of the XA series. The front-end main amplifier circuit adopts the exclusive developed DC-Flow circuit to convert the input AC signal into DC signal operation, and eliminates the transistor switch action to eliminate the "crossover distortion". The front stage adopts the switchable battery DC power supply mode, and the power supply of the latter stage is also specially purified. The suppression of the vibration of the parts is achieved by the super heavyweight casting speaker (up to 30 kg). Surprisingly, even though Avantgarde put so much effort into the front and back of the XA, the overall performance and sound performance are excellent, but the price is unexpectedly "not expensive". The pre- and post-prices are not. To NT$500,000, even lower than many high-priced wires! This also makes Avantgarde's XA front-end class extremely attractive. Any Hi-End audio player who plans to purchase an amplifier with a million-dollar budget should listen carefully and make a decision!
From the above interlaced photos, it can be clearly seen that the XA series front and rear stages use the same chassis, the overall appearance, panel and handle size are exactly the same. In the front panel section, the difference between the XA front and the rear is that there are more operating levers in the front stage and a larger volume knob on the right side. In fact, no matter whether the weight of the XA pre- or post-stage is more than forty kilograms, the key is the super-heavyweight case made of the whole casting inside and outside.
The metal processing of the XA series chassis is very careful. The front panel has a very delicate hairline treatment, and there are still slits around the lever to reveal the operation light.
The front and rear handles of the XA series are not for decorative purposes. Instead, they can be held in the lift case when they are moved. Therefore, the cylindrical handle is engraved with a fine mesh anti-slip pattern. In response to this, the XA pre-stage large volume knob also has the same processing.
The bottom outer ring of the XA front-level volume knob is transparent. With different operating modes (such as AC power supply, DC power supply, and mute), different colors of light will be emitted, and the user can clearly understand the operation status of the XA pre-stage. . The volume control of the XA preamp is a 48-segment progressive design. In order to eliminate the problem of contact wear of the traditional potentiometer, a solid-state switch is used to logically control the resistor network to achieve a very fine volume control, so that the user can get the most at any time. The right volume setting.
Looking at the close-up of the right front of the top of the XA front from the top, the handle is a separate component from the chassis body, but the combination between the two is quite tight.
Looking at the XA front stage from the side, the concave and convex structure of the rear casting case has a sculptural three-dimensional effect.
The front and rear handles of the Avantgarde XA series are available in black and silver. Plus, the original factory offers up to ten different panels. The home can be matched with the home decor or Avantgarde speakers. The original factory can also be used by the user. The name of the board engraved, highlighting the unique personalization.
This is the appearance of the XA front-end backplane. There are five sets of balanced inputs and two sets of balanced outputs. The first three sets of inputs correspond to high-level sources, and the latter two sets of heads are enlarged. In addition, there is a brightness adjustment on the left side of the front panel to display the light.
The XA front and rear outer casings are identical one-piece cast components, and the inner chassis is inserted from the front and locked, so no locking screws are visible from the back. The outer box of the XA front and rear has a weight of 18.5 kg and the inner box is about 10 kg.
This is the "inner box" of the XA pre-stage chassis. It is also a one-piece metal casting structure. The rear side is a monolithic output and input circuit board. The central part is close to the front large area. The battery is installed inside. Each 2,300mAh capacity allows the unit to be switched to battery power. The sound quality and sound field are much more transparent than the AC power supply. The battery full charge can provide continuous operation for about eight hours.
The AC power supply of the XA preamp is hidden in the space on the side of the inner box.
There are three blue-shell power transformers on the AC power circuit board of the XA front stage, which are respectively sent to the different block circuits of the machine after being rectified and regulated.
The front panel of the XA rear stage is quite simple. In addition to the Avantdarde logo on the upper side of the center, only one power switch lever is provided at the lower edge of the middle of the panel.
The XA rear-end backplane also has brightness adjustment of the front panel power switch lever, including the brightness of standby and power-on. In particular, in addition to the balanced input of the left and right groups, there is also a set of balanced outputs; in other words, the XA post-stage can use several serial connections, for example, using one XA pre-stage and two XA post-stages as Bi. -Amp double amplifier drive speaker, more fever, can also use three XA rear to drive the treble, midrange and bass of the speaker.
Also using the one-piece casting method, the "inner box" structure of the XA rear stage is much more complicated than the previous stage. The front circular protrusion is used to accommodate the ring power transformer, and the rear square block is used to lock the power processing circuit board (the left and right channels are completely independent, the total capacity of the filter capacitor is 240,000 microfarads), and the sound of the left and right channels The amplifying circuit is placed in the grooves on the left and right sides.
This is the full equipment of the XA rear stage to remove the "outer box", the left and right channels are completely independent and symmetrical.
This is the XA post-stage one-channel amplification module. Two pairs of power crystals per channel are locked on the thick copper plate. Please pay attention to the circuit board with up to eight filter capacitors of 10,000 microfarads, which is nearby. Provides the power crystal to be used as needed, and enhances the speed and control of the arrangement.
This is the appearance of the bottom of the inner box of the XA rear stage. The 500VA toroidal power transformer used is placed and locked from the bottom. In other words, the power transformer of the XA rear stage is suspended "upside down" under the inner box structure, which makes the vibration of the transformer difficult to transmit to the chassis and the circuit board.
This is the bottom of the XA rear inner box after the "full assembly", even if it is not seen by the maintenance personnel, the "round well" that houses the transformer is covered with a circular metal plate printed with the XA mark. Please note that the thick copper plates on the left and right sides are the lock power crystals. When they are tightly locked with the "outer box", the heat can be transferred to the outer box for rapid divergence.
This is the driver-level power supply filtering and voltage regulator circuit installed at the top of the inner box. The photo is located on the top of each of the two large inductors. It is a fairly rare design, so that the driver stage has a purer sound quality. In actual assembly, the four inductors of the board are placed underneath, and eight long screws pass through the base to tightly lock the inductor and the circuit board to the inner box.
It is suitable for the computers.inspection appliance and instruments with rated voltage up to 300/500V. This product presents an excellent performance in high
frequency locations
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