Hardcore JBL modders have created an improved version: the N7000 Super.
What is the (8 ohms or 16 ohms) of your speaker system?
A rotary control on the chassis allows the user to adjust the tweeter volume to match room acoustics. jbl n7000 schematic
The is a legendary frequency dividing crossover network engineered by James B. Lansing Sound, Inc. during the golden era of high-fidelity audio. Originally designed in the early 1960s, this passive, 2-way network is highly celebrated for adding ultra-high-frequency "brilliance" to classic horn-loaded systems. By crossing over at a remarkably high 7,000 Hz (7 kHz) , it seamlessly integrates the iconic JBL 075 ring radiator tweeter (or 077/2405) with mid-frequency compression drivers like the JBL 375. This configuration can be found in flagship speakers such as the monumental JBL Paragon and the JBL S8R system .
The JBL N7000 is a legendary frequency dividing network (crossover) engineered during the golden era of high-fidelity audio. Designed specifically to pair with JBL’s premium high-frequency components, this crossover is highly sought after by vintage audiophiles, speaker builders, and restoration enthusiasts. Hardcore JBL modders have created an improved version:
The driver stage, often referred to as the Voltage Amplifier Stage (VAS), is the section of the schematic responsible for increasing the signal voltage to the level required to drive the output transistors. The JBL design incorporates a constant current source in this stage. By referencing the schematic, a technician can see how JBL engineers utilized active current sources rather than simple resistors. This ensures that the driver stage operates in a linear fashion regardless of fluctuations in the power supply or load impedance, resulting in a cleaner, more transparent midrange response.
The main HF driver remains connected to the original crossover's HF output. The The is a legendary frequency dividing crossover network
You're looking for a JBL N7000 schematic and maybe a good story to go with it!
A series capacitor that determines the high-pass frequency response.
Moving beyond the power supply, the schematic reveals the heart of the amplifier’s sonic character: the input and driver stages. The N7000 utilizes a differential input stage, a common but effective topology for reducing noise and distortion. In the schematic, this appears as a pair of matched transistors. This configuration is vital for "Common Mode Rejection," which essentially means that any noise picked up by the cables or internal wiring is canceled out before the signal is amplified.
Unlocking the JBL N7000 Schematic: A Guide to the Vintage Ultra-High Frequency Network The Go to product viewer dialog for this item.