Description
Plese Check Photo and Discription.Please feel free to message me if you have any concerns. Manufacturer and model number Accphase DG-28 (with OP unbalanced output board AO-U2) Accessories Remote control, Microphone (AM-28), Microphone cable (XLR/5M), Microphone folder, Operation manual, Adjustment manual, AC cable Condition / Maintenance Maintainer operation checked Remote control/each input/output/operation button functions/representative measurement correction function Operation checked Internal check/Exterior cleaning The display has deteriorated over time and the outer periphery has whitened, The display contents can be checked, but visibility is deteriorated. There are scratches on the rear of the top panel and the lid of the sub-panel. The maintenance work has been performed at our store. All parts are in good working order. ?About the item Accuphase DG-28 ¥530,000 (Released in May 1997) A digital voicing equalizer that uses Accuphases proprietary advanced digital signal processing technology to correct audio. The DG-28 integrates the two functions of voice measurement and correction by utilizing digital signal processing technology. Analog methods have the problems of aging degradation, temperature dependence, limitations of circuit constant accuracy, and characteristic degradation during sound quality adjustment that are inherent in analog circuits, The digital method eliminates these problems. In addition, digital signals are resistant to noise and suitable for frequency-controlled signal processing such as sound quality adjustment and filtering, The DG-28 is a digital system that uses an ultra high-speed DSP (Digital Signal Processor) from input to output. The resolution of this DSP is 24 bits for input and output, and 48 bits for internal processing. Two of these ultra high-speed DSPs with 40ns per operation are installed per channel, four per channel for both left and right channels. The filter cell, the heart of the equalizer, determines various characteristics such as the center frequency of each band and the range of variable levels. In the DG-28, 64 of these cells are combined to form one channel, which is called the filter engine. This filter engine is installed in each of the left and right channels, and the filter cells are connected in parallel. The parallel configuration has the performance advantage that not only do the calculation errors not accumulate, but also the errors cancel each other out and noise is suppressed. The DG-28 uses Accuphases proprietary filtering algorithm, in which multiple DSP chips are tightly coupled to operate a large filter, The structure is designed to isolate filter cells that are not in use, thereby minimizing signal degradation due to calculation errors caused by unnecessary filter operations. High-precision adjustment is possible from 16Hz to 22kHz in 64 1/6-octave bands. A 1/3-octave 32-band is also selectable. The variable level range for each band is ±12dB, adjustable with a resolution of 0.5dB. The PLL circuit extracts the master clock that serves as the system reference from the input DAI (Digital Audio Interface) signal, Accuphases proprietary ultra jitter-free PLL circuit is used for the PLL circuit that extracts the master clock as the system reference from the input DAI (Digital Audio Interface) signal. This circuit uses a preamble signal (a marker indicating the beginning of the LR signal) detection circuit and a crystal oscillator for the VCO, The master clock extracted by this circuit is not affected by jitter or pulse transmission distortion. A 320x240-dot LCD panel is used for the display, allowing graphical adjustment while checking the 64-band correction status and audio measurement information. In addition, the display has an off function and contrast adjustment function, as well as an on/off beep sound to confirm switch operation by ear. The screen has a three-mode configuration, allowing the display to be switched between equalizer mode, preferences mode, and analyzer mode with the MODE switch. A digital tone generator and analyzer function are provided. When measuring audio, the filter engine input is switched to the tone generator side, The signal for measurement is output through the filter engine and amplified by the power amplifier to drive the speakers. The signal that has passed through the sound field space is then picked up by the attached microphone and input to the analyzer section of the DG-28. This allows for accurate sound field correction. The sound field measurement method includes a warble tone (a signal whose frequency is varied within a narrow range) generated by a tone generator and then swept over the entire frequency bandwidth. This measurement method is highly resistant to extraneous noise. This measurement method is resistant to extraneous noise and enables accurate measurement in a short time. The tone generator and analyzer are DSP-based digital systems, so measurements are accurate, stable, and reproducible. An automatic correction function incorporating Accuphases proprietary correction algorithm is built in. The time required for automatic correction is approximately 5.5 minutes for both channels. It is also possible to improve the correction accuracy through averaging process by performing numerous measurements. Normally, when the transmission characteristics are flattened at the listening point, the energy in the high frequency range is audibly dominant. For this reason, it is common practice to make the high frequencies gently descend. The DG-28 has a pre-defined descending characteristic for this purpose, and in addition to the flat characteristic, the DG-28 also has a -1dB/oF characteristic above 2kHz, In addition to the flat characteristic, the DG-28 can be rolled off above 2kHz at -1dB/oct, -2dB/oct, and -3dB/oct. It is also possible to draw the original characteristics (Edit). If you want to add more detailed correction after performing automatic correction, you can make fine adjustments while measuring each 1/6-octave band. Adjustments can also be made using manual correction only. A function to perform only sound field measurement without correction is also provided. Up to four types of corrected characteristics can be saved by selecting any program button. A 1/4-inch type back electret condenser microphone AM-28 is included as a microphone for measurements. The DG-28 is a voicing equalizer with full digital signal processing, but by adding an optional board (sold separately), analog-related inputs and outputs can be operated in the same way as with a conventional graphic equalizer. Optional boards are also available for digital-related functions and can be added according to the application. Up to four option boards can be added. Model : Digital Voicing Equalizer Format: Digital 1/6-octave 64-band (switchable to 1/3-octave 32-band) Center frequency: 64/23 points (between 16Hz and) 22.4kHz, ISO standard) Q (peak sharpness): 1/6 octave: 8.65 / 1/3 octave: 4.32 Frequency response: 0 to 22.4kHz ±0dB (sampling frequency: 48kHz) Gain: 0 to -18dB variable Format?EIAJ CP-1201 Digital Audio Interface Quantization bit rate: 16 to 24 bits linear Sampling frequency: 32kHz, 44.1kHz, 48kHz (auto detection) Optical input level: Optical input, -27 to -15 dBm Coaxial input level: 0.5Vp-p/75? Format: EIAJ CP-1201 Digital Audio Interface Quantization bit rate: 24-bit linear Sampling frequency: Synchronized with input signal Optical output level: Optical output (emission wavelength: 660 nm), -21 to -15 dBm Coaxial output level: 0.5Vp-p/75? Power supply voltage: AC100V, 50Hz/60Hz Power consumption: 12W Maximum external dimensions: 475 W x 150 H x 393 D mm Weight: 13kg SHIPPING?FedEx DHL or Japan Phost?From JapanPackages usually leave our warehouse within 10 days of payment.Weekend orders will ship on Monday or Tuesday.We provide valid Tracking Numbers for all orders. We will ship via FedEx. We can also ship by Japan Post. Please contact me prior to purchase if you wish to ship by Japan Post. PEYMENTS?PayPal?Debit?Cards?Credit?CardsWe ship within 48hours of payment.We Ship Within10 Days of Payment. RETURN INFORMATION?Exchabge possible within 30 days.?If you Have any Problems, Please Contact us in Advance Customoms Duty?Import duties, taxes, and charges are not included in the item price or shipping cost.?These charges are the buyers responsibility.? Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.
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