N7000 Schematic: Jbl

is a classic frequency dividing network (crossover) engineered during the golden era of high-fidelity audio (circa 1962) to extend the range of vintage speaker systems. Specifically, it serves as a high-frequency bridge to add specialized tweeters, like the JBL 075 "Bullet" driver

1. Input terminals: Two binding posts (Red/Black). Red feeds directly to the inductor L2.
2. Midrange output: Tapped directly off the output of L2. There is no capacitor in the midrange path—only the inductor. This is critical: The N7000 does not high-pass the midrange. It only low-passes it. The midrange driver naturally rolls off above 9kHz due to its own mechanical limitations. JBL relied on the driver’s natural acoustic roll-off to meet the electrical crossover.
3. The Tweeter circuit: The input signal splits. One leg goes to L2 (midrange), the other goes to C1 (3uF). After C1, the signal hits the rotary attenuator switch.
4. The Inductor L1 (0.20mH): This is often overlooked. It sits after the attenuator, directly in series with the tweeter positive terminal.
5. The “Zero” Resistor: In the Normal (0dB) position, the switch bypasses all padding resistors—a direct connection.

Capacitors:

High-voltage non-polar capacitors are used for frequency filtering. jbl n7000 schematic

3.2 DC Supply Architecture

7 kHz

The JBL N7000 is a classic passive crossover network designed to integrate ultra-high frequency (UHF) drivers, most notably the iconic JBL 075 ring radiator , into vintage two-way speaker systems. Operating at a crossover frequency of , it is often paired with other vintage networks like the N1200 or LX5 to create a high-performance three-way setup. Understanding the Schematic and Circuitry Input terminals: Two binding posts (Red/Black)