Sony - SEQ-V901 Stereo graphic equalizer

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Equalization bands: 7 bands per channel, with center frequencies at: 100 Hz, 250 Hz, 500 Hz, 1 kHz, 3 kHz, 6 kHz, 14 kHz.
Adjustment range: ± 10 dB on each band.
Frequency response: from 20 Hz to 50 kHz — far wider than human hearing, useful for preserving audio quality at extreme frequencies.
Input sensitivity / output level: 1 V (input), 1 V (output) — standard for Hi-Fi devices.
Signal-to-noise ratio: 100 dB — indicates good dynamic range and low noise.
Total harmonic distortion (THD): 0.01% — very low, a good sign of audio quality.
Dimensions: about 355 × 95 × 310 mm
Weight: about 2.8 kg
The SEQ-V901 provides fine control over equalization: thanks to the 7 bands per channel and the ±10 dB range, you can tailor the sound to your preferences, the type of music, or the characteristics of the room and speakers.
The very wide frequency response and low distortion also make it suitable for high-quality Hi-Fi systems, without pronounced unwanted colorations.
It has a high signal-to-noise ratio — useful for keeping the audio signal clean, especially when working with sensitive sources (phono turntables, DACs, CDs, vinyl, etc.).
Being a vintage model, it also has collectible value for many enthusiasts and can be a good component for rebuilding a system.