The N7000 is a relatively simple high-pass network. Its primary job is to protect delicate ultra-high frequency (UHF) drivers from lower frequencies and to balance their output with the rest of the system. A standard N7000-style circuit usually consists of: Inductors: Used to create the roll-off curve.
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. jbl n7000 schematic
(Prepared for internal engineering review – 12 April 2026) The N7000 is a relatively simple high-pass network
Signal Input (+) → L2 (0.30mH) → Midrange Output (+) ↓ C1 (3uF) → Attenuator Switch → L1 (0.20mH) → Tweeter Output (+) Moving beyond the power supply, the schematic reveals
According to technical documentation and enthusiast discussions on sites like Lansing Heritage , the N7000 is electrically very similar to the JBL 3105 network . Fixed at 7 kHz. Circuit Topology: Typically a 12 dB/octave slope.
Let’s dissect the circuit. While JBL produced slight variations over the production run (late 1950s to early 1980s), the core schematic remains consistent.
Connects to the High Frequency (HF) output terminals of the main network (e.g., LX5 or LX7 Low Output (LF): Typically goes to the mid-range driver (e.g., High Output (HF): Goes to the tweeter/UHF driver (e.g., JBL 075 or 077 www.cieri.net Maintenance Tips L-Pad Cleaning: