The Blow PARAMETRIC EQUALISER 512 is a compact, fully parametric four-band model for a 500 Series rack, based on the channel from the Midas HERITAGE 3000 console. The four bands offer frequency and gain adjustment, while the bass and treble bands can operate with a bell or shelving curve. The input is electronically balanced and the output is balanced, for connection to audio lines.

The rotary concentric controls provide access to the frequency and gain settings. The true bypass switch removes the circuitry from the signal path when equalisation is not in use, while the power-on mute relays limit startup noise.

• Type: Fully parametric four-band equaliser
• Format: 500 Series module
• Bands: High, high-mid, low-mid and low
• Band adjustment: Variable frequency and gain
• Bandwidth: 0.1–2 octaves on bell bands
• High, shelving mode: 1 kHz–20 kHz, cut/boost ±15 dB, slope 4 dB per octave
• High, bell mode: 1 kHz–20 kHz, cut/boost ±15 dB
• High-mid, bell mode: 400 Hz–8 kHz, cut/boost ±15 dB
• Low-mid, bell mode: 100 Hz–2 kHz, cut/boost ±15 dB
• Low, bell mode: 20 Hz–400 Hz, cut/boost ±15 dB
• Low, shelving mode: 20 Hz–400 Hz, cut/boost ±15 dB, slope 4 dB per octave
• EQ control: On/off switch
• Input: Mono, balanced line
• Output: Mono, electronically balanced
• Noise at unity gain: -97 dBu (22 Hz–22 kHz)
• CMRR at unity gain, 1 kHz: -70 dB (typical)
• Input impedance, 1 kHz: 20 kΩ
• Frequency response at unity gain, EQ flat: 20 Hz–20 kHz, ±1 dB
• Maximum input level, 1 kHz: +21 dBu
• Maximum output level, 1 kHz: +21 dBu
• Output impedance, 1 kHz: 50 Ω
• Power supply: +16 V and -16 V
• Power consumption: 100 mA, 3.2 W
• Dimensions (H × W × D): 132 × 38 × 184 mm
• Weight: 0.7 kg