Accuphase DG-28 Digital Equalizer - 64 band 1/6 octave, analog I/O included

Condition is almost like new but I'm 2nd owner which is why I rated it 8/10 per Audiogon instructions. The analog modules which were not included with the original unit, are included in this sale. XLR connectivity is used in these modules.

The DG-28 is a full range digital equalizer intended to correct the frequency response of a 2 channel sound system and compensate for room problems, i.e. it's an excellent room correction tool. It will greatly benefit most systems by flattening (or modifying according to taste) the response from 16Hz to 22.4kHz. The DG-28 incorporates 64 bands (filters) of fixed Q positioned at fixed frequencies spaced 1/6 octave apart. Lowest band is at 16Hz and highest at 22.4KHz. Included as a freebie is the analog in/out plug-in module (model AIO-DGB1) which is normally sold separately. However I never used it, but rather used only the digital interfaces by placing the DG-28 between the CD player and the DAC. Supported sample rates are 32kHz, 44.1kHz, and 48kHz, with up to 24 bits. The room measurement & compensation is performed automatically for both channels, each treated separately (far better than the combined handling used in some commonly advertised room correction units on the market today). After connecting the microphone and placing it at the listening position, follow the detailed instructions in the manual to launch the automatic process. You will first be prompted to select a target response curve (A -1db at 2kHz and dropping linearly to -6db at 20kHz produced the best results in my room). When the automatic process is completed, you are prompted to store the resulting compensation file in one of 4 memory banks. You can repeat the process with a different target curve and store the result in another memory bank. You can also manually tweak a compensation curve and store the tweaked curve in any memory bank. The banks can be switched on the fly while listening to music.

The compensation limits range from -12db to +12db for each of the 64 bands. +12db means 16 times the power, so use extreme caution not to clip your amp and/or damage your speakers if the display shows large positive compensation values.

Please keep in mind that while the DG-28 is a very powerful machine that can improve the sound significantly, you should be fairly technically oriented to be able to use it successfully.

Items Included:
• Original box
• Analog I/O module, model AIO-DGB1 (will be installed in the expansion slots)
• Instruction manual in English (*) plus 2 Asian languages (one Japanese I think)
• Measurement microphone model AM-28 (original)
• Microphone holder
• 5 meter (16.4 feet) microphone cable
• Remote control
• Power cord
(*) - Penciled-in are some helpful notes on 3 of the manual pages.