Neutrik NL4FXX-W-L 4-Pole speakON Speaker Connector – 10–16mm Cable
Build professional high-current loudspeaker cables with the Neutrik NL4FXX-W-L 4-Pole speakON Cable Connector, designed specifically for larger speaker cables with an outside diameter from 10mm to 16mm.
Part of Neutrik’s current-generation speakON FXX Series, the NL4FXX-W-L combines four high-current contacts, screw-terminal termination, stranded-wire protection, a proven twist-lock connection system and Neutrik’s chuck-type cable strain relief in a rugged ergonomic housing.
Neutrik describes speakON as the industry-standard connector system for loudspeaker connections, developed for the high-current demands encountered throughout professional PA and sound-reinforcement systems.
The NL4FXX-W-L is particularly suited to professional applications including:
- Concert touring
- Live sound
- Theatre
- Festivals
- Professional PA
- FOH and monitor systems
- Loudspeaker system cabling
- Equipment-hire inventory
- Production companies
- AV systems
- Broadcast sound
- Venues
- Schools and performing arts centres
- Permanent professional audio installations
Whether you are manufacturing new speaker leads, replacing older NL4FC/NL4FX connectors, repairing touring cable stock or building heavier-gauge loudspeaker cables, the NL4FXX-W-L provides a robust current-generation Neutrik connection designed for demanding professional use.
Designed for Large 10–16mm Loudspeaker Cable
The “L” in NL4FXX-W-L identifies the large-cable version of Neutrik’s current 4-pole speakON cable connector.
Neutrik specifies:
Cable Outside Diameter: 10–16mm
This is one of the most important specifications on the product.
It makes the NL4FXX-W-L particularly useful for larger professional loudspeaker cables where conductor count, conductor size and overall jacket construction produce a cable diameter beyond the range accommodated by smaller speakON connector versions.
Applications may include:
- Heavy-duty speaker cables
- Long loudspeaker runs
- Four-core loudspeaker cables
- Touring speaker looms
- Amplifier rack output cables
- Speaker-link cables
- Multi-channel speaker cables
- Installation speaker cabling
Always measure or verify the actual outside diameter of the cable before ordering.
NL4FXX-W-L vs NL4FXX-W-S
Neutrik produces two principal current 4-pole FXX cable-size versions:
NL4FXX-W-S: 6–12mm cable O.D.
NL4FXX-W-L: 10–16mm cable O.D.
The electrical connector format is similar, but the strain-relief and rear-bushing arrangement is designed around different cable diameter ranges.
Choose the W-L version when using larger cables between 10mm and 16mm outside diameter.
Correct cable sizing matters because Neutrik’s chuck-type strain relief must grip the cable jacket properly to provide the intended mechanical retention.
Current-Generation Replacement for Earlier speakON Connectors
Neutrik identifies the NL4FXX-W-S and NL4FXX-W-L as direct successors to the discontinued NL4FC and NL4FX families, with the correct replacement depending on cable outside diameter.
For older cables fitted with discontinued NL4FC or NL4FX connectors, the current FXX series therefore provides a logical replacement path.
The NL4FXX-W-L is the appropriate current option where the cable falls within the larger 10–16mm range.
This makes the connector particularly useful for:
- Venue cable refurbishment
- Touring stock maintenance
- Hire-company workshops
- Old cable inventory upgrades
- Replacement of damaged legacy speakON connectors
Always confirm cable diameter and conductor size before selecting the replacement.
Professional 4-Pole speakON Connection
The NL4FXX-W-L provides four electrical contacts.
Neutrik’s assembly instructions identify these as:
1+
1−
2+
2−
This provides flexibility for professional loudspeaker systems that use either one or both contact pairs.
Depending on the loudspeaker and amplifier system, four-pole speakON cabling may be used for:
- Single-channel loudspeaker connections
- Two-channel speaker cables
- Bi-amplified systems
- Speaker-link systems
- Multi-way loudspeaker systems
- Amplifier-rack outputs
- Touring speaker multicore arrangements
The actual wiring must always follow the equipment manufacturer’s pin assignment.
Never assume that every four-pole speakON system uses 1+/1− and 2+/2− in exactly the same way.
High-Current Loudspeaker Connection
The NL4FXX-W-L is specifically designed for professional loudspeaker applications requiring substantial current capacity.
Neutrik currently specifies regional ratings of:
Europe – IEC 61984: 37 A / 250 V AC
USA – UL 1977: 35 A / 250 V AC
Canada – CSA C22.2 No.182.3: 24 A / 250 V AC.
Neutrik therefore markets the connector with an up to 37 A RMS current rating.
These are connector-component ratings under the corresponding approvals.
The safe and appropriate capability of a completed loudspeaker cable also depends on:
- Cable conductor size
- Cable construction
- Cable length
- Amplifier
- Loudspeaker
- Wiring configuration
- Installation method
- Applicable electrical requirements
The connector specification should never be used in isolation to determine a complete cable’s capacity.
Important: Not a Mains Power Connector
Despite its high current and voltage ratings, Neutrik explicitly states that speakON is:
not intended for use as an AC or DC mains or power-supply connector.
The connector is intended for loudspeaker connections, not general electrical power distribution.
Do not use the NL4FXX-W-L for:
- Mains power
- Generator distribution
- General AC power cables
- DC power-supply connections
- Equipment power leads
For mains-power applications, use connectors specifically designed, certified and approved for that purpose.
Do Not Connect or Disconnect Under Load
Neutrik also provides an important safety warning:
speakON connectors are not intended for interrupting current.
The assembly documentation states that the connector should not be engaged or disengaged during normal use while live or under load.
In practical professional audio terms:
- Mute or disable the relevant amplifier output before connection changes.
- Do not treat the speakON connector as an electrical on/off switch.
- Follow the amplifier and loudspeaker manufacturer’s shutdown and connection procedures.
This warning should be included on any technically detailed product page because it is a genuine manufacturer safety requirement.
Screw-Terminal Assembly
The NL4FXX-W-L uses screw-type terminals rather than solder termination.
Neutrik specifies solid contacts with screw terminals incorporating stranded-wire protection.
This provides a practical professional termination system for speaker cable assembly and repair.
Advantages of screw termination include:
- No soldering required
- Straightforward field servicing
- Suitable for substantial speaker conductors
- Reusable connector construction
- Quick professional assembly
- Strong mechanical conductor retention when assembled correctly
Neutrik’s current assembly instructions specify a T8 Torx terminal screw arrangement with a tightening torque of 0.7 Nm.
Correct assembly torque and cable preparation are important for maintaining dependable electrical and mechanical performance.
1.5–4mm² Conductor Range
Neutrik’s current model-specific product specification lists a conductor range of:
1.5–4mm²
17–11 AWG.
This makes the NL4FXX-W-L suitable for substantial professional loudspeaker cable conductors.
When choosing cable, consider both:
- Individual conductor size
- Overall cable outside diameter
A conductor may fit electrically while the complete cable jacket is too small or large for the strain-relief system—or vice versa.
For this version, the cable must fall within the 10–16mm O.D. range.
Stranded-Wire Protection
The screw terminal system includes stranded-wire protection.
This is important with flexible professional speaker cable, which generally uses stranded conductors to maintain flexibility.
The terminal design helps secure the conductor without relying on a solder joint, but professional cable preparation remains essential.
Before assembly:
- Strip conductors to the correct length
- Avoid cutting strands
- Keep strands together
- Prevent stray copper strands
- Confirm the correct contact designation
- Tighten terminals to the specified torque
- Inspect each termination before closing the connector
Incorrect conductor preparation can create poor connections, shorts or excessive resistance regardless of connector quality.
Reliable Twist-Lock System
speakON is well known for its twist-lock connection system.
The connector inserts into a compatible chassis connector and rotates into its locked position.
The system provides a positive mechanical connection that is particularly useful around:
- Loudspeakers
- Amplifier racks
- Touring systems
- Stage systems
- Hire equipment
- Permanent PA installations
A properly connected speakON plug is significantly less likely to be accidentally removed than an unsecured friction-fit connector.
Always ensure the connector is fully engaged and correctly locked before operation.
Ergonomic Two-Component Housing
Neutrik’s FXX design incorporates an ergonomic slip-resistant two-component moulded housing.
For production crews, good grip becomes particularly useful when connectors are being handled:
- During fast bump-ins
- Behind speaker cabinets
- Inside amplifier racks
- In dark stage environments
- While wearing work gloves
- During touring changeovers
The housing is designed for reliable handling rather than requiring users to pull directly on the cable to disconnect it.
Always grip the connector body rather than pulling a speaker cable by its jacket.
Improved Cable Kink Protection
The NL4FXX-W-L uses a two-component rear bushing designed to improve kink protection around the cable exit.
The rear of a connector is one of the most common mechanical stress points on any touring cable.
Speaker leads are constantly:
- Coiled
- Uncoiled
- Bent
- Packed
- Pulled from cases
- Routed around racks
- Connected to cabinets
Good bend support helps reduce concentrated mechanical stress immediately behind the connector.
Neutrik Chuck-Type Strain Relief
The connector uses Neutrik’s locking bushing and chuck-type strain relief designed specifically for 10–16mm cables.
Neutrik states that the strain relief mechanically locks with the insert and aligns with the housing, helping simplify correct assembly.
The strain-relief system is important because normal pulling forces should be transferred to the cable jacket—not directly to the electrical conductor terminations.
For professional touring and rental cables, this is a major component of long-term reliability.
Low Contact Resistance
Neutrik specifies contact resistance of:
≤2 mΩ.
Low connector resistance is particularly relevant to loudspeaker systems because speaker cables may carry significantly more current than conventional line-level audio cables.
Overall cable performance will also be influenced by:
- Conductor cross-sectional area
- Cable length
- Cable material
- Termination quality
- Number of connections
A quality connector is one part of maintaining a low-resistance loudspeaker path.
Silver-Plated Copper-Alloy Contacts
The NL4FXX-W-L uses copper-alloy contacts with silver plating.
The contact system is designed for high-current professional loudspeaker applications.
When servicing speaker cable:
- Keep contacts clean
- Inspect for physical damage
- Replace heavily worn connectors
- Check that locking components operate correctly
- Test repaired cables before use
Neutrik’s assembly documentation specifically states that connectors with broken parts or excessive wear should be replaced for safety and certification reasons.
Typically 5,000 Mating Cycles
Neutrik specifies a typical mechanical lifetime of:
5,000 mating cycles.
This makes the connector well suited to professional applications where speaker cables are continually connected and disconnected.
Examples include:
- Touring PA
- Equipment hire
- Theatre
- Festivals
- Venues
- Rehearsal facilities
- Production companies
Actual service life will depend on handling, cleanliness, cable assembly quality, mating connectors and mechanical wear.
Theatre and Performing Arts
Professional theatre sound systems often rely on speakON cable infrastructure for loudspeaker connections.
The NL4FXX-W-L can be particularly useful for larger cable assemblies connecting:
- Amplifier racks
- Main loudspeakers
- Stage monitors
- Delay speakers
- Fill systems
- Subwoofer systems
- Touring PA packages
The twist-lock system helps provide secure connections around temporary stage systems where equipment is regularly installed and removed.
Concert Touring
Speaker cabling in concert touring is subjected to demanding daily use.
Cables are repeatedly:
- Deployed
- Connected
- Disconnected
- Coiled
- Packed
- Loaded
- Transported
- Reinstalled
The NL4FXX-W-L is particularly relevant to touring systems using large-gauge or four-core loudspeaker cable.
The 10–16mm cable range allows connection of substantial professional cable constructions while Neutrik’s strain-relief system, ergonomic shell and twist lock suit repeated road use.
Professional PA Systems
Typical professional PA applications can include:
- FOH loudspeaker systems
- Stage monitors
- Subwoofers
- Delay systems
- Fill speakers
- Amplifier racks
- Portable PA
- Installed venue systems
Always follow the loudspeaker and amplifier manufacturer’s wiring requirements.
Incorrect speakON wiring can cause:
- Missing output
- Reversed polarity
- Incorrect channel routing
- Incorrect loudspeaker section operation
- Equipment problems
Verify every completed cable before deployment.
Subwoofer and High-Power Loudspeaker Cables
Large-diameter cable is often selected where a sound system requires substantial conductor cross-section, multiple conductors or long loudspeaker runs.
That makes the W-L 10–16mm version particularly relevant to some:
- Subwoofer cables
- Main PA loudspeaker cables
- Amplifier-to-speaker trunk cables
- Heavy-duty touring leads
However, connector size alone does not determine whether a cable is appropriate for a particular amplifier or loudspeaker.
Cable conductor size and length should be selected as part of the complete loudspeaker-system design.
Four-Core Loudspeaker Cable
The four-contact arrangement makes the NL4FXX-W-L a natural connector option for suitable four-core loudspeaker cable.
A single four-core cable may carry two loudspeaker circuits or multiple elements of a compatible loudspeaker system.
This can reduce the number of individual cables required in some system designs.
Always follow the actual loudspeaker-system pinout.
Do not assume that 2+/2− are used merely because they are physically available.
Equipment-Hire Companies
The NL4FXX-W-L is particularly useful in equipment-hire workshops.
Applications include:
- New speaker cable manufacturing
- Damaged connector replacement
- Touring package preparation
- Cable refurbishment
- Custom cable lengths
- Rental inventory maintenance
Standardising around current-generation Neutrik FXX connectors can simplify:
- Spare-parts inventory
- Workshop procedures
- Technician familiarity
- Cable identification
- Field repairs
Festivals and Major Events
Large events can deploy substantial PA systems with large quantities of speaker cable.
Potential applications include:
- Main stages
- Secondary stages
- Delay towers
- Front fills
- Monitor systems
- Subwoofer arrays
- Temporary distributed audio
Professional cables used in these environments need to cope with repeated installation, removal and transport.
The NL4FXX-W-L provides a current Neutrik connector option for the larger-diameter loudspeaker cables often found in professional systems.
Broadcast and Studio Sound
speakON may also be used where professional broadcast or studio facilities operate passive loudspeaker and monitoring infrastructure.
Applications may include:
- Studio monitor systems
- Production loudspeakers
- Temporary broadcast stages
- Live music broadcast
- Performance spaces
The connector should only be used where the equipment is designed for compatible speakON loudspeaker connections.
Schools and Performing Arts Centres
Schools, universities and performing arts centres often operate professional PA and theatre systems.
The NL4FXX-W-L can be useful for:
- Building speaker cables
- Repairing venue stock
- Theatre audio systems
- Auditorium PA
- Music facilities
- Technical-production training
Because the connector is designed for high-current loudspeaker applications, assembly should be undertaken by appropriately skilled personnel.
IP20 Protection Class
Neutrik specifies the NL4FXX-W-L as:
IP20.
It should therefore not be described as waterproof or weatherproof.
For outdoor concerts and festivals:
- Protect connections from rain
- Keep them away from standing water
- Do not leave them exposed to weather
- Follow loudspeaker and amplifier manufacturer instructions
- Use suitable weather-management systems
Professional ruggedness and environmental sealing are not the same thing.
Operating Temperature
Neutrik specifies a temperature range of:
-33°C to +80°C.
The actual usable temperature range of a completed speaker cable may be limited by other components, particularly:
- Cable jacket
- Cable insulation
- Connected equipment
- Installation environment
Always consider the complete assembly.
Electrical Specifications
Neutrik specifies:
Contact Resistance: ≤2 mΩ
Dielectric Strength: 2.8 kV AC
Insulation Resistance: >10 GΩ initially
Number of Contacts: 4.
Regional connector ratings are:
IEC 61984 Europe: 37 A / 250 V AC
UL 1977 USA: 35 A / 250 V AC
CSA Canada: 24 A / 250 V AC.
Again, these figures do not mean the connector may be used as a mains-power connector.
speakON is specifically intended for professional loudspeaker connections.
Certified Professional Connector
Neutrik currently lists compliance/certification including:
- IEC 61984
- UL 1977
- CSA C22.2 No.182.3.
These approvals form part of the connector’s professional technical specification.
Correct installation remains essential to maintaining the intended performance and compliance.
Colour Coding Options
Neutrik offers optional coloured XXL-series bushings for the larger NL4FXX-W-L connector.
Current colour options include:
- Red
- Orange
- Yellow
- Violet.
Colour coding can help professional production companies identify cables according to:
- Length
- Speaker type
- Amplifier rack
- Stage
- System
- Department
- Ownership
- Production package
Neutrik specifies the XXL accessories for the W-L large-cable version, while the smaller W-S model uses XXS-series coloured bushings.
Cable Assembly
Neutrik’s current assembly documentation specifies cable preparation of approximately:
27mm outer jacket strip
9mm conductor strip
with a T8 Torx terminal tool and 0.7 Nm terminal torque.
The rear bushing and chuck must be placed over the cable before the connector insert is assembled.
Neutrik also instructs that the chuck must be correctly aligned with the insert keyway during final assembly.
Professional assembly should follow the current Neutrik instruction sheet supplied for the connector.
Always Test Completed Loudspeaker Cables
Before placing a newly assembled or repaired speaker cable into production, test it for:
- Correct pin assignment
- Continuity
- Shorts
- Conductor integrity
- Correct connector assembly
- Secure strain relief
- Reliable twist-lock operation
A cable tester suitable for speakON connections can help verify wiring before the cable is connected to amplifiers and loudspeakers.
This is particularly important with four-pole cables where incorrect 1+/1−/2+/2− wiring can route amplifier channels incorrectly.
Product Specifications
Brand: Neutrik
Model: NL4FXX-W-L
Series: speakON FXX
Connector Type: Loudspeaker cable connector
Number of Poles: 4
Contacts: 1+, 1−, 2+, 2−
Termination: Screw-type terminals with stranded-wire protection
Cable O.D.: 10–16mm
Conductor Size: 1.5–4mm² / 17–11 AWG
Locking System: Twist lock
Contact Material: Copper alloy
Contact Plating: Silver
Contact Resistance: ≤2 mΩ
Dielectric Strength: 2.8 kV AC
Insulation Resistance: >10 GΩ initially
European Rating: 37 A / 250 V AC – IEC 61984
US Rating: 35 A / 250 V AC – UL 1977
Canadian Rating: 24 A / 250 V AC – CSA C22.2 No.182.3
Mechanical Life: Typically 5,000 mating cycles
Housing: Polyamide PA6 / TPE
Insert: Polyamide PA6.6
Locking Element: Zinc die-cast
Strain Relief: Polyketone
Bushing: Polypropylene / TPE
Protection Class: IP20
Flammability: UL94 V-0
Temperature Range: -33°C to +80°C
Important: Not for AC/DC mains or power-supply use; not for interrupting current.
Why Choose the Neutrik NL4FXX-W-L?
Choose the NL4FXX-W-L where professional loudspeaker cable construction requires:
- Genuine Neutrik speakON
- Four-pole speaker connectivity
- Large 10–16mm cable compatibility
- 1.5–4mm² conductor support
- Up to 37 A RMS connector rating
- Screw terminals
- Stranded-wire protection
- Secure twist locking
- Professional chuck-type strain relief
- Improved cable kink protection
- Low contact resistance
- Typically 5,000 mating cycles
- International approvals
- Serviceable professional construction
It is particularly well suited to larger professional speaker cables used across touring, theatre, festivals, venues, equipment hire and sound reinforcement.
Why Buy Neutrik NL4FXX-W-L from GigLife?
GigLife supplies professional connectors, cables, adaptors, tapes, consumables and technical accessories specifically for the entertainment and production industries.
With more than 25 years of hands-on live entertainment industry experience, GigLife understands that speaker connectors are not simply components—they become part of cables that may be deployed, connected, coiled, toured, repaired and depended upon show after show.
Products are selected by people who work in production and understand the requirements of:
- Audio professionals
- FOH engineers
- Monitor engineers
- Theatre technicians
- Touring crews
- Production companies
- Film and television departments
- Broadcast facilities
- Festivals
- AV companies
- Schools and performing arts centres
- Conference venues
- Exhibition contractors
- Equipment-hire businesses
Whether you are building heavy-duty speaker leads, repairing touring inventory, preparing a festival PA package or maintaining venue workshop stock, GigLife supplies professional components chosen by people who understand the job.
Orders are dispatched from Brisbane, with Australia-wide shipping available.
GigLife is proudly by the professionals… for the professionals.
