Anqiao TX-DS939 AV power amplifier analysis

The TX-DS939 AV amplifier came out at the beginning of the Do1ly AC-3 technology announcement. Its golden appearance and simple and elegant design give people a noble feeling. Its AC-3 decoder uses Motorola's 56009 and 56004 models, 24-bit digital processing chips, which are used to process Dolby AC-3 and THX control programs, respectively. 56009 is the world's first AC-3 decoder chip with 24bit design, its operating frequency is 80MHz, the maximum transmission rate is 40MIPS, while the traditional 20bit chip, the operating frequency is 66MHz, the maximum transmission rate is only 33MIPS. In addition, the power consumption of 56009 is lower than that of traditional chips, and the heat generation is also greatly reduced. This is very meaningful for AV amplifiers with large heat output, which can greatly reduce the heat dissipation design work of the chip. When it is used with the same 24-bit THX processing chip 56004, it can be seamless.
The most special feature of Onkyo TX-DS939 power amplifier is that it has a measurement microphone. With this function, the speaker level and placement distance can be automatically set. The speakers are placed at different distances in the listening range, the general technology can only adjust the appropriate sound pressure level for the first channel, and Onkyo's unique ARA sound field analysis system, in addition to automatically adjusting the sound pressure of each channel In addition to the level, the delay time of each channel can be set, so that users can easily obtain the best results and accurate frequency response.
In addition to using high-quality fever components in the power amplification part, TX-DS939 uses a large transformer weighing 5.5kg, plus a thick sealing layer, which not only has a heat dissipation effect, but also prevents resonance. The five power amplifiers of TX-DS939 are all low-impedance driving methods of discrete components. Their power is up to 200W × 2 (front left / right channel 6Ω), 185W × 3 (center / surround channel 6Ω). From the perspective of pure music, when the total harmonic distortion is 0.003%, the power of the front field channel is also as high as 120W × 2. Enough to easily promote any AV speaker. The five channels of TX-DS939 all use large anti-magnetic binding posts to make the audio current smooth and unobstructed. The ultra-quiet cooling fan on the back panel inside the chassis greatly improves the cooling performance of the whole machine. The fan adopts intelligent control design, which is only turned on when the whole machine is working at full load, which reduces the interference of the fan current on other parts and reduces the burden on the power supply. TX-DS939 provides extremely complete input terminals, including 4 sets of analog input, 1 set of AC-3 RF input, 1 set of coaxial input, 2 sets of optical fiber and 3 sets of video and S-Video input. In this way, TX-DS939 It can ensure that you can easily connect various types of AV equipment.
When TX-DS939 replays CD stereo, although the sound quality is slightly blunt, it is crisp and full of vitality. It cleverly mixes moderate viscosity and clarity, especially in the low and middle frequency bands, and it is extremely charming. Although low-frequency audio does not belong to the type of abundance, the sense of hierarchy is quite clear, which proves that this machine has very good resolution. When replaying surround sound, the most fascinating thing is the thick and sticky sound field of the THX 5.1 channel. The texture of the lines is slightly too soft, but the surround sound effect is very rich and wide. Whether it is a 2-channel stereo or surround sound replay, the stability of the sound is outstanding, which of course has a close relationship with its substantial power supply. TX-DS939 has such excellent spatial reproducibility, it can be said that it has opened up a new realm for home theater systems. var check_allow = "/d/Api/iscantalk.html"; var add_url = '/ d / article / write /'; function CheckLogin () {now_uid = ''; var ElecfansApi_checklogin = '/ webapi / passport / checklogin'; var logout_url = "{: U ('Login / logout')}"; var logout_url = 'http://bbs.elecfans.com/member.php?mod=logging&action=logout&refer=front'; $ .get (ElecfansApi_checklogin, function (data, textStatus) {if (data! = "") {EchoLoginInfo (data); CheckEmailInfo (data); data = $ .parseJSON (data); now_uid = data.uid; / * var login_content = 'write an article