Pyramid Studio SEA-3000 Pro Electronic Crossover Network - $200 (Delta). SN: 13406.JBL SR4725 Crossover Networks.Single Unit.SN: 13406Pulled from a working cabinet. SR4725 Crossover Network from JBL working cabinet. EC2800 can custom tailor the sound of three way four way and multi driver speaker systems connected. Electronic crossover designed for home and studio audio systems. NUMARK EC-2800 Stereo Electronic Crossover Network- Band Pass Filter System - In mint condition from the 1980s. NUMARK EC-2800 Stereo Electronic Crossover Network- Band Pass Filter - $140 (Westlake). Despite its exceptional performance, it draws negligible battery power. The EC-200 is so compact it can be installed almost anywhere. The results are phenomenal - distortion under 0.003%, signal-to-noise ratio better than 105dB - performance that not only matches but exceeds that of most home-audio systems! The DC-to-DC converter also isolates circuit ground from battery ground for minimum noise. With positive and negative supplies, high-performance direct-coupled circuits can be used for super dynamic range and minimum distortion. Nakamichi Mobile-Sound Components are in a class by themselves - designed to uncompromising standards to bring home sound to the road! The EC-200's DC-to-DC converter generates balanced high-voltage power from the ordinary car battery. Steep 18dB/octave slopes ensure a sharp division between bands for minimum coloration. 
By "staggering" crossover points, you can correct standing wave conditions so that bass is neither boomy nor weak but incredibly natural. The crossover point of each section is independently adjustable in 5 steps from 50Hz to 220Hz. The EC-200 allows you to adjust the relative levels of the two regions to compensate for differences in subwoofer/main-speaker efficiencies and for differences in acoustic absorption.
The low-frequency speakers - the subwoofers - can be placed where they produce smoothest bass response, the midrange/treble drivers where they produce best imagery and the most natural high-end response. Each is directed through separate power amplifiers and loudspeakers to create a system of unusual flexibility. The EC-200 divides the musical spectrum into two parts - a low-frequency region that contains the deepest musical fundamentals and forms the underpinning to give music "punch", and an upper-bass/midrange/treble region that creates the stereo imagery, presence and brilliance. Works perfectĮlectronic Crossovers With Unsurpassed Sonic Performance And Flexibility
Come out in the early 90 still pulls up to $200 on ebay. Some say the best sounding crossover ever made. This is a used nakamichi EC 200 Mobile electronic crossover network.
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