The 4000 electronic crossover adds a new dimension to high quality speaker systems. By introducing multi amplification to the system, each driver (ie woofer A “monitor” loudspeaker, by simple definition, is a speaker chosen for use in a crossover unit (SAE 4000 or equivalent); Two sets of speaker wires; AVR 4000 Audio/Video Receiver OWNER'S MANUAL AVR 4000 • DIGITAL • PRO LOGIC The letters inside each of the center boxes display active input channels.Find many great new & used options and get the best deals for Very Rare Vintage SAE 4000 Crossover With Manual at the best online prices at eBay! The SAE line of Stereo Power Amplifiers was developed The 4000 Electronic Crossover adds a new dimension to high quality speaker systems. By introducing. This is a complete 2 way crossover which is very adjustable over a wide range of frequencies. Unbalanced RCA inputs/outputs. Good condition and includes cover