DiAnderson Holdings will launch a network-compatible preamplifier "MODEL40n" that can connect televisions through HDMI ARC in late March. Silver, gold and black, the price is 286000 yen (including tax). HDMI transmissions with high-quality network audio reproduction are aware of the TV connection and TV combination, and by equipped with ARC-compatible HDMI terminals, the preamplifier is also aware of applications connected to the TV. The amplifier part is equipped with an analog amplifier, which can be used as a pure audio or as a home theater in the living room. In addition, as described later, a separate method of high sound quality for transmission of sound signals via the HDMI is implemented. Like the "MODEL30" and "SACD30n" launched in 2020, it adopts the shell design of "symbolizing the new generation of Maranz". As mentioned above, the main color also prepares two colors to achieve coordination with the space, taking into account that even if it is placed in the living room, it will not be used with a sense of incoordination. Maranz spokesman Takayama said: "to put it simply, the appearance of fashion is related to everything, the whole family can use it, and the sound is very good." Such a product. In addition, MODEL30 is not a superior / subordinate model and a successor, but is sold at the same time because of its different personalities as a product. With the update of the design, a comprehensive review of the mechanism design is possible. The thickness of the steel plate of the main chassis is the same as that of the high-end machine "12 Series". In addition, for the aluminum side cover, the thickest part of more than 12 series is made of high-rigid aluminum plate of 5.7mm. In addition, in addition to the main chassis, a 3 mm thick base plate is added. In addition, especially thick screws are used in the fixation of insulators and power transformers, and the details are thoroughly improved, thus achieving a firmness comparable to the upper model. HDMI terminals correspond to ARC and HDMI CEC, and can input linear PCM (2ch) up to 192 kHz/24bit. The audio signal transmitted through the HDMI cable, without going through the HDMI interface device, is directly input to the Digital Audio Selector (DIR), and the high sound quality is achieved by using the short signal path of the audio signal. In addition, sound quality tuning is provided, such as enhancing the power supply of digital audio circuits, reducing noise and enhancing the ground. As a result, the same high sound quality as other digital inputs is achieved in the sound signal transmission of the HDMI. In addition, there are also cases in which the stereo regeneration model is not multi-channel, which does not correspond to eARC. Through the variable gain volume circuit, in the noise reduction part, the highest level of volume control IC "MUSES72323" is used in the volume reduction part of the daily cleaning micro-devices also equipped with MODEL30. The MUSES72323 is a linear volume control circuit composed of high-speed amplifier modules "HDAM" and "HDAM-SA2". Parallel push-pull / fully discrete power amplifier and variable gain volume control are used to amplify the preamplifier only through the power amplifier rather than in the normally used volume range. Compared with the PM8006, the noise is reduced by 45%. The linear volume control circuit can greatly improve the spatial expression because the crosstalk and volume difference between the left and right channels are not inevitable in the mechanical volume. In addition, the volume between 0 and 78 is a 0 gain specification, which is fixed to a low gain at medium or low volume to make the SN feel better. Set to variable gain only when the volume is high. With regard to the volume of "78", the developer explained that "even auditions will not use a large volume," and continued that "Japanese customers use more people around 40 or 50." In addition, it shows that the click noise will not be generated during the volume operation through the gain switching based on zero cross detection. Through the acceleration detection system, when rotating slowly, the volume can be adjusted quickly with high precision. In addition, because the variable resistor is not used, it is not accompanied by the deterioration of the sound quality of the volume department over the years, so it can be used with confidence for a long time. The parallel push-pull / fully discrete power amplifier adopts a current feedback amplifier with "HDAM-SA3" fully discrete configuration. By using parallel push-pull to form the output stage, the instantaneous current supply capacity is increased to about 1. 5 times of the PM8006 68A, and the driving force of the loudspeaker is greatly improved. According to the aforementioned tail, the number of transistors has also increased significantly. "for example, a large current can be flowed by increasing the faucet," and as mentioned above, the driving force of the loudspeaker has been improved. In addition, in order to quickly spread and dissipate the heat generated from the transistor and stabilize the operation of the transistor, the copper plate is added to the radiator of the thick aluminum extruded material. Thus, it has nothing to do with the loudspeaker and volume connected to the large output of the 100W+100W (4 Ω), and always takes into account the stable and high quality sound. In order to improve the instantaneous current supply capacity, the power supply circuit for power amplifier and the integrated short-circuit power line layout of output stage are adopted. By connecting the large current lines at the shortest distance and arranging the left and right channels symmetrically, we achieve instantaneous force and excellent spatial expression. Equipped with the largest large-capacity ring transformer, the PM8006 increases by 17% in mass and 14% in diameter. Taking into account the stable supply of clean current, and can also withstand the requirements of instantaneous high current. In addition, as a countermeasure of flux leakage, a double shield of silicon steel plate shielding against horizontal flux leakage is applied on an aluminum short ring that suppresses vertical flux leakage. In addition, the magnetic field ring is also cut off by making non-magnetic brass from the bolts used for fixing. And the rectifier circuit adopts ultra-low leakage current Schottky barrier diode. In addition, in the smoothing circuit, the special custom block capacitor made by Erna (18000 μ F / 50V) is used to feedback the know-how developed in the advanced model. Equipped with high-resolution network playback and a variety of streaming music delivery support for MM ink cartridges of the NF- CR voice converter "Marantz Musical Phono EQ". The low distortion is achieved by reducing the gain of each stage of the two-stage amplifier structure and the constant current feedback circuit in the audible band. In addition, by using the pre-amplifier with J-FET input, the input coupling capacitor is eliminated and the purity of the signal path is improved. The influence of external noise is suppressed by accommodating the atomizer in the shielding housing and also providing a shielding plate between the adjacent Dswab A conversion circuits. Equipped with high-resolution network playback and a variety of streaming music transmission of the separate wireless audio system "HEOS" network audio function. You can play sound sources stored in NAS, USB memory and HDD, and you can also play music connected to smartphones and tablets. In addition, music being played by the MODEL40n can also be distributed to other HEOS devices located on the same network. In addition, it also supports Amazon Music HD, AWA, Spotify, SoundCloud and other music streaming services. It also supports online radio stations, and you can search for various online radio stations from "TuneIn". Support Amazon Alexa, support the voice control of Alexa devices. In addition to supporting AirPlay2, you can also play in multiple rooms through multiple AirPlay2-compatible devices, add MODEL40n as an attachment to the "home" application, and play songs from Apple Music and iPhone libraries through Siri's voice control. Wi-Fi can use both 2.4 GHz band and 5 GHz band, and also supports MIMO (Multiple-Input and Multiple-Output). The connection to the router also supports the sharing of settings from a "WPS" or iOS device (after iOS7) connected by a button. Music playback for NAS, USB memory, and HDD supports up to DSD 5.6 MHz and PCM 192 kHz/24 bits. It also supports seamless playback of DSD, WAV, FLAC, and Apple Lossless files. Copper foil film capacitors, high sound quality thin film capacitors, high sound quality electrolytic capacitors, precision wafer resistors, metal film resistors and so on are also used in preamplifier circuit, Dram A conversion circuit and atomizer circuit. Use high sound quality components carefully selected through the listening test. The speaker output is equipped with Maranz original speaker terminal "SPKT-1+". The core is a solid material cut from brass solid wood. According to the results of the hearing test, the surface treatment is not the previous nickel substrate + gold-plated layer 2, but a thick layer of nickel plating. The terminal supports cables up to 4.5 mm in diameter. It also supports Y lag and banana plugs. In addition, the input and output terminals are gilded. The influence of mutual interference and external noise is eliminated by accommodating the digital audio board including the network module, the Dhammer A conversion circuit and the noise equalizer circuit in the shielding case. In addition, a large physical distance between the power supply circuit and the audio circuit is adopted, and by arranging the radiator, it is used as a shielding layout in an attempt to block the influence on the audio signal due to noise and leakage flux generated from the power supply circuit. In addition, it also has the function of turning off network and USB memory playback, Wi-Fi and Bluetooth circuits, as well as turning off the display. As a result, noise from a peripheral circuit affecting the analog audio signal is suppressed. Sound input terminal class, in addition to the above HDMI and USB, optical digital input and coaxial digital input, preamplifier can be connected to Power Amp In, MM (1 system), unbalanced 3 system equipment. "not only the HDMI, but all the inputs are well tuned" (Mr. tail). The output includes subwoofer pre-output, Rec Out and headphone terminals.
Editorial department: Kashi Ono
