Legacy Products

442 – Dual 15 Band Graphic EQ w/ LEDs


The 400 SERIES 442 Precision Graphic Equalizer has been designed and engineered to exceed extremely high standards for audio performance and functionality. This innovative, high-quality equalizer is perfect for critical audio applications where precision frequency tailoring, reliable performance, rugged design and extremely silent processing are absolutely essential.

The 442 equalizer features active filter sections, which incorporate a Constant-Q design.
This Constant-Q design, with extremely accurate precision center frequencies, ensures that the bandwidth of every individual filter will be narrow enough to prevent unnecessary interaction between filters, yet still create an equalization curve wide enough to produce the exact and precise processing of audio frequencies the user seeks. Additionally, the 442 utilizes an LED array for easy visual confirmation of the output level of the unit.

The 442 also features automatic relay bypass of audio, an essential function if power to the unit is lost. Rugged construction and solid audio performance makes the 442 particularly well suited to fixed installation as well as touring live sound systems. It has a variable input level control, clip level indicator, ground lift switch, and selectable line voltage. Additional features include selectable Scale Switching – (High Slider Resolution +/-6dB – or Normal Resolution (+/-12dB), active balanced and unbalanced input/output connectors, and RFI filtering. A passive Bypass switch allows for direct comparison between the equalized and non-equalized signal for each channel.

Key Features


Filter Type Constant-Q – 3% center accuracy
Frequency Bands 2×15, 2/3 Octave, ISO Spacing
Frequency Response 20Hz to 20kHz, +/- 0.5dB
Input Impedance 24K Ω (bal), 12K Ω (unbal)
Input/Output Connections Active balanced XLR and 1/4″ TRS {XLR pin 2, 1/4″ tip = Hot (+)}. Unbalanced RCA.
Maximum Input Level +22 dBm
Maximum Output Level +22 dBm
Output Impedance <150 Ω (typical)
Power Requirements 95-130VAC, 50/60Hz, 12 W (USA) 190-250VAC, 50Hz (Export)
Range +/- 6dB or +/- 12 dB selectable
Signal to Noise Ratio 94dB (typical)
Slider Travel 60mm w/ positive center detent
Total Harmonic Distortion 0.0001
Dimensions 7.5″ D x 19″ W x 3.5″ H
Weight 7.5 lbs (3.4 kg)