Studio EQ Massive Sound White 4000 Equalizer Pair FREE SHIPPING !

White 4000 Series 27-band EQ These units sold for around $2k new and could not be built for that today. White Instruments Series 4000 is a vintage, high-end 1/3 octave pro audio graphic equalizer originally designed in the 1970s for premium live sound reinforcement and studio room tuning. Celebrated for their precision and ultra-transparent, uncolored signal path, these units feature a robust inductor-based or gyrator-based passive filter design combined with active makeup circuitry to guarantee high linearity and low noise floor. [1, 2, 3, 4]Key Specifications & Architecture Frequency Bands: Features 27 1/3-octave bands centered on standard ISO frequencies, typically running from 40 Hz through 16 kHz. [1] Filter Design: Utilizes precision inductors sealed in magnetically shielded enclosures to eliminate hum and interference. [1] Control Behavior: Features proportional-Q ("Equal Q") continuous rotary knobs rather than sliders, providing ±10 dB of boost or cut with smoother summation curves between adjacent bands. [1, 2] High-Pass Filter: Includes a variable high-pass filter adjustable from 20 Hz to 160 Hz (12 dB/octave slope). [1] Build Quality: Built with sealed Mil-Spec potentiometers and a fully modular design featuring field-replaceable integrated circuits Sold as is according to our policy on used items, will be carefully packed and promptly shipped using Reverb Safe Shipping. Thanks for looking.