Quick Answer / Summary: NL4 = 4-pole speakON: 1+/1- for channel A, 2+/2- for channel B, around 30 A rating, touch-proof and twist-locking. Cable versions terminate 4-conductor cable; panel versions mount in cabinets and amps. Uses: bi-amped cabinets (one cable carries HF and LF), daisy-chaining two cabinets, and reducing cable count on stage. Standardize the pin map across the fleet.
The NL4 is the workhorse of stage loudspeaker wiring: four poles, one locking shell, two channels per cable. Its value is in the wiring convention, not the connector alone. This guide covers both.
Two Channels, One Cable
The NL4’s reason to exist: a single four-conductor cable carries two loudspeaker channels. In a bi-amped system, channel A feeds the HF driver and channel B the LF driver – one cable per cabinet instead of two. In a daisy-chain, channel A feeds cabinet one and channel B feeds cabinet two from the same amp output pair. Both patterns halve cable runs and connector count, which is why NL4 became the stage default while NL2 remained for simple links.
Bi-Amp Pattern
One NL4 per cabinet, HF on 1+/1- and LF on 2+/2-. The amplifier’s two channels map directly to the connector’s two pole pairs.
Daisy-Chain Pattern
Cabinet one on 1+/1-, cabinet two on 2+/2-, fed from the same amplifier channels. Each cabinet’s internal wiring must match the convention.
Cable vs Panel Versions
Cable connectors terminate four-conductor speaker cable with screw or solder terminals; the chuck grips 8-14 mm jackets typical of speaker cable. Panel versions (MP suffix family) mount in cabinets and amplifier rear panels, with solder tabs or PCB pins. Cabinet panels often use two NL4s wired in parallel so cabinets can be linked – the pass-through pattern that lets one amp feed a stack. Check whether a cabinet’s second connector is a true parallel link or a separate channel before assuming.
Parallel Panel Wiring
Two panel NL4s wired pole-to-pole make a through-connection. Verify before daisy-chaining – some cabinets wire the second connector to a different pole pair.
Cable Jacket Size
Speaker cable is thicker than mic cable. NL4 chucks accept 8-14 mm; undersized chucks are the common ordering error.
Standardizing the Pin Map
The professional practice: one pin map across the whole inventory – 1+/1- channel A, 2+/2- channel B, always. Label both ends of every cable with the map, and test continuity per pole. Mixed maps are how a bi-amped cabinet receives LF where HF belongs, which sounds like a blown driver but is a wiring error. Also verify amplifier output assignments: bridging modes change which poles carry signal, and the manual’s pin table overrides habit.
Bridge Mode Trap
Bridged amplifiers output on different poles than stereo mode. Read the amp’s pin table before wiring an NL4 to a bridged channel.
Label the Map
A cable labelled ‘1+/1- A, 2+/2- B’ can be patched by anyone. Unlabelled four-pole cables invite the phase and channel errors.
NL4 Pin Map
| Pole | Channel | Typical Duty |
|---|---|---|
| 1+ | A hot | Primary channel positive |
| 1- | A cold | Primary channel negative |
| 2+ | B hot | Second channel positive |
| 2- | B cold | Second channel negative |
| Shell | None | Not connected in speaker duty |
Real-World Application Scenarios
A club’s bi-amped tops run one NL4 per cabinet: HF on 1+/1-, LF on 2+/2-. A rental stack daisy-chains two cabinets per amp channel with a parallel panel NL4. A festival’s monitor world standardizes NL4 pin maps across 40 cables so any tech can patch any wedge.
Recommended Internal Resources
(1) Product cluster – https://zh-zong.com/productlist/ (anchor: NL4 speakON connectors and leads); (2) FAQ – https://zh-zong.com/faq/ (anchor: pin map and bi-amp questions); (3) Contact – https://zh-zong.com/contact/ (anchor: request NL4 harnesses).
Related Reading in This Series
- speakON Socket: Panel Mounting, Cutouts and Parallel Wiring
- speakON Power Connector: The Confusion With powerCON, Settled
- XLR Connector to Jack: Balanced to Unbalanced Without the Hum
Frequently Asked Questions (FAQ)
Q: What is an NL4 connector?
A: A 4-pole speakON loudspeaker connector: 1+/1- for one channel, 2+/2- for a second, rated around 30 A with twist-lock mating.
Q: How do I wire a bi-amped cabinet with NL4?
A: HF on 1+/1-, LF on 2+/2-, one cable per cabinet. Confirm the cabinet’s internal wiring and the amplifier’s pin table first.
Q: Can I daisy-chain cabinets with NL4?
A: Yes, if the cabinet’s second connector is wired in parallel. Verify with continuity before relying on the pattern.