YAMAHA 15-Band Graphic Equalizer

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This is a YAMAHA GQ1031BII 31-band mono graphic equalizer.
This is a professional 1U rackmount audio correction unit that has been trusted in professional sound environments for many years. It allows for very fine-grained sound quality adjustment by dividing the range from 20Hz to 20kHz into 31 steps at 1/3 octave intervals.
It is equipped with both XLR and standard phone jacks for input/output, making it suitable for a wide range of applications, from PA systems and recording to sound creation for musical instruments. Its intuitive operation, characteristic of analog equipment, and Yamaha's signature clear sound are its appealing features.

Main Specifications
Type: 31-band mono graphic equalizer
Controls: 31 bands (1/3 octave, center frequencies 20Hz-20kHz)
Variable range: ±12dB
Input/Output terminals: XLR-3-31/32 type, and stereo phone jacks (balanced)
Size: 19-inch, 1U rackmount size

[Product Condition]
This item has been tested for sound output through headphones/speakers.
Operation: The input/output and equalization functions have been confirmed to be operational. However, due to the lack of detailed inspection, it is being sold **as is (junk)**.
Exterior: Dust accumulation due to long-term storage, as well as scuffs, minor scratches, and discoloration (pitting) consistent with age are visible on the top panel of the unit.
Maintenance: The exterior has been lightly cleaned with alcohol. Please consider this item with the understanding that internal cleaning and contact maintenance of the sliders may be required.

[Recommended Points]
Although sold as junk, the fact that it produces sound is a significant advantage.
Its precise correction capability with 31 bands remains a powerful tool for sound field correction in listening rooms, suppression of specific frequency feedback (howling), and sound creation for instruments such as guitars and basses. This is a highly recommended item for those who enjoy maintenance or wish to acquire professional-grade equipment at a low cost.