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.
Many original N7000 units were filled with a black tar-like potting compound. This compound was used to reduce mechanical resonance and protect components from moisture. However, it makes repairing them incredibly difficult. Restorers often have to carefully heat the chassis to remove the compound or build an entirely new network on a fresh breadboard using the schematic layout. Replacing Capacitors (Recapping)
Original units were built with high-quality, hand-wound aluminum foil capacitors (not electrolytics) and low-loss inductors held to . REBUILD your JBL crossovers. LX5, N7000, N2400 ... - eBay
It typically features a variable L-Pad or selector switch (often an ALPS control) to adjust the high-frequency output level. Key Specifications Thread: Rebuilding a JBL N7000. Possible? jbl n7000 schematic
Go to product viewer dialog for this item. is a vintage high-frequency dividing network primarily used to add a 075 tweeter to existing two-way systems, such as the JBL Paragon . 🛠️ Schematic & Technical Specs
At first glance, the N7000 schematic appears as a complex web of lines, resistors, capacitors, and inductors. However, closer inspection reveals a deliberate architecture centered on the crossover network—the heart of any multi-driver loudspeaker. The schematic tells the story of signal division. It illustrates how the incoming audio current is meticulously split, sending low frequencies to the woofers and high frequencies to the tweeters.
Cast aluminum potted housing (vintage versions) or open terminal board Deconstructing the JBL N7000 Schematic Moving beyond the power supply, the schematic reveals
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variant; decreasing this value shifts the crossover point higher (e.g., Capacitors (
Solder the new components in place. Keep lead lengths short to avoid stray inductance. This configuration is vital for "Common Mode Rejection,"
Consists of a series capacitor (C2), a parallel inductor (L2), and an attenuation network (potentiometer or fixed resistors).
(7 kHz). Its circuit is designed to provide a 12 dB per octave rolloff on both sides of this frequency, ensuring a smooth transition between drivers. Thread: JBL N7000 Crossovers - LANSING HERITAGE
Investigations into vintage N7000s have shown that while capacitor types changed (from wax-filled to epoxy-filled), the core capacitor part #10460 (1.5 μ F) remained consistent.
The official schematic diagram is the blueprint for the N7000. It is a public document that JBL has made available for service purposes. The diagram details the circuit, showing every component and its connection.
Because high-frequency horn drivers are often significantly more efficient than woofers, the N7000 schematic includes an attenuation circuit.