User manual ACCUPHASE DG-38

[. . . ] It embodies Accuphase's highly advanced knowledge of digital signal processing technology for audio applications. Latest high speed DSP chips as well as HS-Link input and output capability make the DG-38 perfectly suited to handle all high-quality program sources including SACD. Functionally, the DG-38 is divided into two equalizing modules. [. . . ] Because the digital filters for sound field compensation and sound field creation are separate, equalization can be further modified after the sound field compensation (voicing) curve has been established. CONFIGURATION The DG-38 has four main operation modes: "Voicing", "Equalizer", "Analyzer", and "Configuration". Four buttons on the front panel are used to select the respective mode. Spectrum analyzer Configuration The spectral content of the input signal can be displayed on a spectrum analyzer screen with 1/3 octave spacing, 35 bands, and real-time operation. This function is entirely separate from the adjustment functions of the unit, allowing you to monitor peak levels in real time. Comparison of Voicing and Equalizer on/off condition and checking of right/left frequency distribution are also possible. This screen lets you make environment and function settings, such as selecting the Voicing/Equalizer modes, controlling levels, left/right balance, screen brightness and contrast, screen data send etc. Functions are activated directly on the screen with the stylus pen. Advanced compensation functions VOICING application examples The DG-38 automatically measures the sound field and provides accurate compensation based on target characteristics representing the ideal sound field. Compensation may be performed using ) a preprogrammed standard reference curve, * an automatically created target curve, or +a freely created curve. Speaker For testing, the DG-38 outputs four warble tones of different frequencies simultaneously. These are heard as a combined sound. Microphone A dedicated sound field measurement microphone with controlled frequency response is supplied with the DG-38. The microphone is a 1/4-inch type back-electret condenser type with ultra-thin diaphragm, which assures linear response over a wide frequency range. Setup screen for Voicing level and channel, microphone settings, etc. Power amplifier Preamplifier The internal test signal generator of the DG-38 produces warble tones which are used to drive the speakers via the power amplifier. The sound travels through the sound field and is picked up by the microphone for sound field measurement. Ex. 1 Using preprogrammed standard reference curve Ex. 2 Compensation with automatically created target curve (Creating a curve that incorporates speaker and room characteristics) Ex. 3 Compensation with freely created curve Using the stylus pen, any desired target curve can be created freely. First, automatic measurement of characteristics before compensation is carried out. m Speaker and room characteristics (Separate measurement for L, R or simultaneous L/R measurement is possible) m Individual speaker characteristics Flat The DG-38 comes with four preprogrammed reference curves: three curves with high-end rolloff (­1 dB, ­2 dB, ­3 dB per octave) and flat response. If flat response was selected for compensation + Auto generation of curve for flat response Auto compensation is performed based on the target curve. [. . . ] n HS-Link, optical, and coaxial digital input/output connectors provided as standard equipment n Input signal selector menu of DG-38 allows the user to choose HS-Link, optical, coaxial, or installed option board n Connection to analog components implemented via option boards n Up to four option boards can be installed Option boards that can be used in the DG-38 KDigital boards Digital Line Input/Output Board DIO-OC1 [Number of slots used: 1] KAnalog boards * The analog input signal is converted to a digital signal by an on-board A/D converter. The digital output signal is converted to an analog signal by an on-board D/A converter. Line Input Board AI2-U1 [Number of slots used: 1] Balanced Input Board AI2-B1 [Number of slots used: 2] Provides coaxial and optical inputs and outputs. * Supports sources with sampling frequencies up to 96 kHz. * Conventional high-level input * Input signal is converted to 24-bit digital signal by on-board A/D converter. Û Example for connecting the output of a digital component such as a SACD/CD transport and the analog output of a component such as a CD player directly to the DG-38compensation for source connected with coaxial cable or optical fiber Optical fiber cable Audio cable 75-ohm coaxial cable HS-Link cable Audio cable Preamplifier Audio cable Audio cable Power amplifier Input board For balanced connection: AI2-B1 (2 slots) For unbalanced connection: AI2-U1 (1 slot) Output board For balanced connection: AO2-B1 (2 slots) For unbalanced connection: AO2-U1 (2 slots) For balanced connection: AI2-B1 (2 slots) For unbalanced connection: AI2-U1 (1 slot) [ Preamplifier Input board Output board For balanced connection: AO2-B1 (2 slots) For unbalanced connection: AO2-U1 (2 slots) Connection example for multi-amped system with DG-38 DF-35 Multi-amped system with DG-38 between DC-330 and DF-35 Û When connection to DG-38 is made via coaxial or optical fiber cable, sources input to DC-330 with sampling frequencies up to 96 kHz are supported. 75-ohm coaxial cable Optical fiber cable Direct HS-Link connection of DG-38 ð DC-330 ð DF-35 creates multi-amped system with support for SACD sources. Multi-amped system to handle all sources input to DC-330 Û HS-Link connection handles all sources that are input to the DC-330, including SACD. HS-Link cable DIO-OC1 installed in EXT DSP and OUTPUTS slots HS-Link cable Multi-amped system with analog preamplifier and DG-38/DF-35 DO2-HS1 installed DO2-HS1 installed in OUTPUTS slot DI2-HS1 installed in EXT DSP slot (2 slots) Û Output of analog preamplifier is connected to DG-38 for sound field compensation, and digital output of DG-38 is sent to DF-35. * Set EXT DSP button of DC-330 to ON for sound field compensation of input sources. [. . . ]