The Boss GE-21 Graphic Equalizer is a half-rack, 21-band equaliser designed for precise tonal shaping across the full audio range. With sliders set at half-octave intervals from 22 Hz to 22 kHz and a ±15 dB range per band, it delivers detailed control for recording or PA work.
A separate Total Level control provides an additional ±15 dB to compensate for overall gain changes, while an overload indicator warns when signals approach clipping, illuminating 6 dB before the clip point.
Engineered for professional performance, the Boss GE-21 specifies residual noise below −100 dBm (IHF-A) and total harmonic distortion under 0.01 percent. Two Boss GE-21s can be mounted side by side in 1U using the optional RAD-50 adaptor, with front-panel EQ In/Out and Level switches, clear status indicators, and connections for EQ Remote, input, output and AC adaptor.
Features
- 21 bands at half-octave spacing: Centre frequencies from 22 Hz to 22 kHz
- Centre frequencies: 22, 31.5, 45, 63, 90, 125, 180, 250, 355, 500, 710, 1k, 1.4k, 2k, 2.8k, 4k, 5.6k, 8k, 11k, 16k, 22k Hz
- Per-band control: ±15 dB variable range on each slider
- Total Level control: ±15 dB overall gain compensation
- Overload indicator: Warns 6 dB below clipping for easy level management
- Pro specifications: Residual noise < −100 dBm (IHF-A); THD < 0.01%
- Half-rack format: Mount two GE-21 units in 1U with RAD-50 adaptor
- Front-panel operation: EQ In/Out and Level switches with clear status indicators
- Remote ready: EQ Remote jack for external control