### Overview: Neutrik NL4MP-ST The **NL4MP-ST** is a professional-grade, 4-pole chassis connector part of the **speakON** series manufactured by Neutrik. It is specifically designed for loudspeaker and amplifier interconnections. The "ST" suffix indicates that this model features **screw terminals**, allowing for field installation without the need for soldering. --- ### Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Connector Type** | speakON Chassis Connector | | **Number of Contacts** | 4 (1+, 1-, 2+, 2-) | | **Termination Style** | Screw Terminals | | **Rated Current** | 30 A RMS continuous | | **Rated Voltage** | 250 V AC | | **Gender** | Male (Receptacle) | | **Contact Resistance** | $\leq 3$ m$\Omega$ | | **Insulation Resistance** | $> 1$ G$\Omega$ | --- ### Physical and Mechanical Characteristics 1. **D-Shape Flange:** It uses the industry-standard "D" size cutout, making it compatible with most rack panels and speaker cabinets. 2. **Air Tightness:** The design is optimized for speaker cabinets, ensuring that no air leaks through the connector, which is critical for maintaining the acoustic integrity of ported or sealed enclosures. 3. **Locking Mechanism:** Features a reinforced metal locking system that mates with the NL4FC (cable connector) for a secure, "twist-lock" connection. 4. **Wiring Versatility:** The 4-pole design allows for: * **Single-channel** (using 1+ and 1-). * **Bi-amped systems** (using 1+/1- for LF and 2+/2- for HF). --- ### Wiring Configuration The screw terminals are color-coded and labeled to prevent wiring errors. | Terminal | Common Usage | | :--- | :--- | | **1+** | Positive Channel 1 | | **1-** | Negative Channel 1 | | **2+** | Positive Channel 2 (or Bridged +) | | **2-** | Negative Channel 2 (or Bridged -) | --- ### Advantages of the NL4MP-ST * **No Soldering Required:** Ideal for quick repairs or on-site assembly. * **High Current Handling:** Suitable for high-power PA systems and subwoofers. * **Durability:** Glass-reinforced materials make it resistant to mechanical stress and environmental factors. ---