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This Solid State Logic 611EQ has been fully tested by our expert team and comes with a money back guarantee and lifetime support. The SSL 611EQ puts the equalizer section of the legendary SL 4000 E console channel strip into a single 500 Series slot — and uniquely, it contains both versions of that EQ in one module. Early E Series consoles used the "Brown Knob" circuit, known for its musical, forgiving response and ±15 dB of cut and boost; later consoles were fitted with the "Black Knob" circuit, developed in collaboration with George Martin, offering a more assertive character with ±18 dB range and tighter low-frequency control. A single switch toggles between them, giving two distinctly voiced EQs from one module. The four-band design covers 30 Hz–450 Hz on the low shelf, two fully parametric mid bands spanning 200 Hz–2.5 kHz and 600 Hz–7 kHz, and a high shelf reaching up to 16 kHz — with the high and low bands switchable between shelf and bell. Paired with the 611DYN, it recreates one of the most recorded console channel strips in history right inside a lunchbox.Welcome to Providence Sound and Vision, where your satisfaction is our top priority!As an employee-owned company, we deeply appreciate your support. Your trust in us means the world, and we're committed to providing unparalleled service every step of the way. Here's what you can expect with every purchase:Extended Warranty Enjoy an additional year of warranty on all new items. We're so confident in the quality of our products that we go the extra mile to ensure your peace of mind.Quality Assurance Our used items undergo rigorous testing and servicing to guarantee their performance. Plus, they come with a money-back guarantee, so you can shop with confidence.Risk-Free Shopping Not completely satisfied? No worries! We offer a 7-day money-back guarantee on pre-owned items and a 14-day money-back guarantee on new items.Lifetime Support We're here for you for the long haul. Whether it's warranty support, part replacements, tune-ups, or trade-ins, count on us to assist you for as long as you own the product.Ready to elevate your sound shopping experience? Explore our store and website for a diverse selection of top-quality items. Your journey to producing amazing sound starts here!Thank you for choosing Providence Sound and Vision. Let's make music magic together!