FIELD GUIDESource-led reference
Port & Cable

P128 / Audio / Connector

4-pole speakON loudspeaker connector

The four-pole speakON form requires a documented loudspeaker connection and wiring arrangement; it is not a mains connector.

Also called NL4 NL4FXX 4 pole speaker connector Speakon 4

Four poles do not specify an amplifier wiring mode.

Look for

Record the exact connector designation from the equipment manual and compare the housing keying; do not assume a mating or wiring arrangement.

Claim inspection dates: 2026-10-03, 2026-10-11 · Independent review pending

4-pole speakON loudspeaker connector: three-quarter view. Computer-generated illustration, not a photograph.

Three-quarter view Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

4-pole speakON loudspeaker connector: mating face. Computer-generated illustration, not a photograph.

Mating face Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

4-pole speakON loudspeaker connector: fitted in place. Computer-generated illustration, not a photograph.

Fitted in place Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

4-pole speakON loudspeaker connector: original recognition drawing, not to scale.

Recognition drawing Original schematic, not to scale. Drawing review pending.

Application notes / Audio / P128

Does the two-to-four mating rule work in reverse?

FIELD NOTES 04

Not for the named NL2MPXX chassis example: Neutrik explicitly excludes a four-pole cable connector. Keep cable and chassis roles visible in any comparison.

Identify first

Read the part and the device.

Read pole count and cable/chassis role together.

Still unresolved

Keep this requirement open.

A different receptacle model or equipment wiring scheme is not covered by this exclusion.

Documented support · named example only

Does NL2FXX-W-S have a documented four-pole chassis mating path?

Yes, using +1/-1 according to Neutrik.

Boundary. Component mating only; this does not approve the connected amplifier/speaker circuit.

Next check. Check the equipment’s use of those contacts before connecting.

S102 · C127D (private workspace)

Explicit source exclusion · named example only

Does NL2MPXX accept a four-pole cable connector?

No: Neutrik explicitly excludes that combination.

Boundary. Do not reverse the separate NL2FXX-W-S two-to-four statement.

Next check. Identify a manufacturer-documented cable/chassis pair.

S496 · C128D (private workspace)

Before choosing an adapter or reader

  1. Copy the chassis part number.
  2. Check the cable-to-chassis direction in the manufacturer statement.
  3. Confirm the equipment circuit separately; do not force an unmatched connector.
Read the evidence and its scope · 4 observations

C128A (private workspace) — Neutrik NL4FXX-W-S is a four-contact speakON connector.

Identification and explicitly scoped documentation only; not an end-to-end connection approval

S103

C128B (private workspace) — Neutrik excludes use as an AC mains or power-supply connector.

Identification and explicitly scoped documentation only; not an end-to-end connection approval

S103

C128D (private workspace) — Neutrik explicitly excludes a four-pole cable connector from its NL2MPXX two-pole chassis connector.

Named chassis exclusion; the two-to-four cable/chassis relationship is not reciprocal.

S496

C127D (private workspace) — Neutrik NL2FXX-W-S is documented to mate with two-pole and four-pole chassis connectors, using contacts +1/-1.

Named two-pole cable connector mating statement. This is not four-circuit connectivity or approval of equipment wiring.

S102

Source interpretation is not independent engineering review, hardware testing, wiring advice or a public-release approval.

The useful distinction

Recognize it. Then verify it.

The four-pole speakON form requires a documented loudspeaker connection and wiring arrangement; it is not a mains connector. [C128A]

Neutrik excludes use as an AC mains or power-supply connector. [C128B]

Neutrik explicitly excludes a four-pole cable connector from its NL2MPXX two-pole chassis connector. [C128D]

Source-scoped identification facts

Each value retains its exact example, role and measurement axis. Facts from different parts must not be combined into an invented component.

Documented examples; not a mating drawing or compatibility approval
Nominal contacts4S103Nominal contact count; some implementations may omit populated positions. It is not a wiring map.
Connector rolecable socket (NL4FXX-W-S)S918Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. NL4FXX-W-S. Documented role: cable socket. Current product PDF differs from olderBDA63830Arating. Preserve old source record and contextualize dates.; Not for ACmains or power supply use; not for interrupting current. Acceptance diameter6–12mm is not connector width.
Mountingcable (Claim C128C); cable (Claim C128D)S103 · S194 · S496Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Terminal designations for the named speakON cable-connector family only; not a bi-amping/channel assignment or live-connection approval Named chassis exclusion; the two-to-four cable/chassis relationship is not reciprocal.
Coupling / latchTwist lock; mechanically aligned insert/chuck/housing (NL4FXX-W-S)S918Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. NL4FXX-W-S. Documented role: cable socket. Current product PDF differs from olderBDA63830Arating. Preserve old source record and contextualize dates.; Not for ACmains or power supply use; not for interrupting current. Acceptance diameter6–12mm is not connector width.
ManufacturerNeutrik (NL4FXX-W-S)S918Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. NL4FXX-W-S. Documented role: cable socket. Current product PDF differs from olderBDA63830Arating. Preserve old source record and contextualize dates.; Not for ACmains or power supply use; not for interrupting current. Acceptance diameter6–12mm is not connector width.
SeriesspeakON 4-pole (NL4FXX-W-S)S918Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. NL4FXX-W-S. Documented role: cable socket. Current product PDF differs from olderBDA63830Arating. Preserve old source record and contextualize dates.; Not for ACmains or power supply use; not for interrupting current. Acceptance diameter6–12mm is not connector width.
Exact part / implementationNL4FXX-W-S (NL4FXX-W-S)S918Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. NL4FXX-W-S. Documented role: cable socket. Current product PDF differs from olderBDA63830Arating. Preserve old source record and contextualize dates.; Not for ACmains or power supply use; not for interrupting current. Acceptance diameter6–12mm is not connector width.

Not recorded: Positions / cavity span, Populated contacts, Contact rows, Contact pitch, Dimensions / axis, Contact gender / arrangement, Keying / polarization, Shell / form, Recorded markings, View convention. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits
  • Bi-amping, channel assignment and amplifier/speaker wiring remain device-specific.
  • Generic mating dimensions are not published.
  • Neutrik 4-pole speakON contact designations (NL4MP chassis, NL4FXX cable): Neutrik contact designations.
  • Neutrik wiring suggestion: stereo on one NL4MP socket: Neutrik designations.
  • Neutrik wiring suggestion: bi-amp on one NL4MP socket: Neutrik designations.
  • Yamaha PX10/PX8/PX5/PX3 SPEAKERS A NL4 output: Yamaha p. 11 drawing shows the NL4 receptacle with 1+/1-/2+/2- legends.
  • Yamaha PX10/PX8/PX5/PX3 SPEAKERS B NL4 output: As channel A.
  • Neutrik NL4MP contact designations (no application): Neutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.
  • Yamaha PX10/PX8/PX5/PX3 SPEAKERS A (channel A) NL4MD output: Neutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.
  • Yamaha PX10/PX8/PX5/PX3 SPEAKERS B (channel B) NL4MD output: Neutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.
  • Neutrik wiring suggestion: bi-amp on one NL4 cable: Neutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.
  • Prior view context (not a source-view value): Terminal labels only; no mating-face geometry is asserted in the V35 data model.
Report a correction to these facts →

Bounded facts, visible unknowns

Specifications and limits

4-pole speakON loudspeaker connector facts and limitations
Documented identificationNeutrik NL4FXX-W-S is a four-contact speakON connector. [C128A]
Important distinctionNeutrik excludes use as an AC mains or power-supply connector. [C128B]
Mechanical dimensionsNo independently approved mechanical dimensions. Do not use this record for fabrication or fit testing.
Engineering pinoutSource-checked engineering profile available; independent review pending. Open engineering profile →
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

Record the exact device model and the label beside the port. Obtain its manual and the accessory documentation. Keep unknown properties unknown instead of filling them from a visually similar item.

Before you connect

What to check

  1. Check amplifier and speaker documentation together.
  2. Do not infer channel or bi-amplification wiring from pole count.
  3. Follow the no-mains and manufacturer disconnection instructions.
Trace a supported connection class →

Pins & wiring

Pinout

Choose the exact wiring. Pin numbers follow its stated view; a schematic does not establish physical positions. Check your exact device before wiring.

What the status labels mean
Confirmed
Recorded research passes agree within this variant; this is not independent human review or hardware validation.
Single source
Only one underlying document, or one pass, supports this assignment.
Device-specific
Supported for the named equipment or wiring only. Check your device’s manual.
Unverified
Missing or conflicting evidence. Do not wire from this row.
Not connected
The source explicitly says NC, no contact or no pin for this wiring.
Wiring variant

Neutrik 4-pole speakON contact designations (NL4MP chassis, NL4FXX cable)

View and evidence limits

Neutrik contact designations.

  • P128 speakON 4-pole — **Agree** on contact names and on the Yamaha PX mapping (channel A socket: 1± = A, 2± = B; channel B socket: 1± = B, 2± not connected) and Neutrik's bi-amp suggestion (1± LF, 2± HF) — A also records Neutrik's stereo suggestion.
  • Neutrik PG p. 16 shows a bridged-mono example, but the extracted text pairs 1+ to speaker '+' and 1- with 2+ to speaker '-' in a way that could not be resolved from text alone; no device manual for bridge mode on speakON was retrieved.
  • Only the Yamaha PX series was checked.
4-pole speakON terminal-designation referenceNeutrik contact designations.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1+: 1+ (single_source)1+1-: 1- (single_source)1-2+: 2+ (single_source)2+2-: 2- (single_source)2-powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Neutrik 4-pole speakON contact designations (NL4MP chassis, NL4FXX cable) — source-scoped contact map
PinSignalWhat it doesStatus
1+1+Control, detection or configuration connection; check the source and device.Single source
Sources
1-1-Control, detection or configuration connection; check the source and device.Single source
Sources
2+2+Control, detection or configuration connection; check the source and device.Single source
Sources
2-2-Control, detection or configuration connection; check the source and device.Single source
Sources
Sources (2)

Neutrik wiring suggestion: stereo on one NL4MP socket

View and evidence limits

Neutrik designations.

  • P128 speakON 4-pole — **Agree** on contact names and on the Yamaha PX mapping (channel A socket: 1± = A, 2± = B; channel B socket: 1± = B, 2± not connected) and Neutrik's bi-amp suggestion (1± LF, 2± HF) — A also records Neutrik's stereo suggestion.
  • Application suggestion by Neutrik, not a mandatory standard.
  • Neutrik PG p. 16 shows a bridged-mono example, but the extracted text pairs 1+ to speaker '+' and 1- with 2+ to speaker '-' in a way that could not be resolved from text alone; no device manual for bridge mode on speakON was retrieved.
  • Only the Yamaha PX series was checked.
4-pole speakON terminal-designation referenceNeutrik designations.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1+: Left + (single_source)1+1-: Left - (single_source)1-2+: Right + (single_source)2+2-: Right - (single_source)2-powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Neutrik wiring suggestion: stereo on one NL4MP socket — source-scoped contact map
PinSignalWhat it doesStatus
1+Left +Control, detection or configuration connection; check the source and device.Single source
Sources
1-Left -Control, detection or configuration connection; check the source and device.Single source
Sources
2+Right +Control, detection or configuration connection; check the source and device.Single source
Sources
2-Right -Control, detection or configuration connection; check the source and device.Single source
Sources
Sources (1)

Neutrik wiring suggestion: bi-amp on one NL4MP socket

View and evidence limits

Neutrik designations.

  • P128 speakON 4-pole — **Agree** on contact names and on the Yamaha PX mapping (channel A socket: 1± = A, 2± = B; channel B socket: 1± = B, 2± not connected) and Neutrik's bi-amp suggestion (1± LF, 2± HF) — A also records Neutrik's stereo suggestion.
  • Neutrik: 'Lower numbers for lower frequencies.'
  • Neutrik PG p. 16 shows a bridged-mono example, but the extracted text pairs 1+ to speaker '+' and 1- with 2+ to speaker '-' in a way that could not be resolved from text alone; no device manual for bridge mode on speakON was retrieved.
  • Only the Yamaha PX series was checked.
4-pole speakON terminal-designation referenceNeutrik designations.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1+: LF + (single_source)1+1-: LF - (single_source)1-2+: HF + (single_source)2+2-: HF - (single_source)2-powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Neutrik wiring suggestion: bi-amp on one NL4MP socket — source-scoped contact map
PinSignalWhat it doesStatus
1+LF +Control, detection or configuration connection; check the source and device.Single source
Sources
1-LF -Control, detection or configuration connection; check the source and device.Single source
Sources
2+HF +Control, detection or configuration connection; check the source and device.Single source
Sources
2-HF -Control, detection or configuration connection; check the source and device.Single source
Sources
Sources (1)

Yamaha PX10/PX8/PX5/PX3 SPEAKERS A NL4 output

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

Yamaha p. 11 drawing shows the NL4 receptacle with 1+/1-/2+/2- legends.

  • P128 speakON 4-pole — **Agree** on contact names and on the Yamaha PX mapping (channel A socket: 1± = A, 2± = B; channel B socket: 1± = B, 2± not connected) and Neutrik's bi-amp suggestion (1± LF, 2± HF) — A also records Neutrik's stereo suggestion.
  • Neutrik PG p. 16 shows a bridged-mono example, but the extracted text pairs 1+ to speaker '+' and 1- with 2+ to speaker '-' in a way that could not be resolved from text alone; no device manual for bridge mode on speakON was retrieved.
  • Only the Yamaha PX series was checked.
4-pole speakON terminal-designation referenceYamaha p. 11 drawing shows the NL4 receptacle with 1+/1-/2+/2- legends.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1+: A+ (device_specific)1+1-: A- (device_specific)1-2+: B+ (device_specific)2+2-: B- (device_specific)2-powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Yamaha PX10/PX8/PX5/PX3 SPEAKERS A NL4 output — source-scoped contact map
PinSignalWhat it doesStatus
1+A+Control, detection or configuration connection; check the source and device.Device-specific
Sources
1-A-Control, detection or configuration connection; check the source and device.Device-specific
Sources
2+B+Control, detection or configuration connection; check the source and device.Device-specific
Sources
2-B-Control, detection or configuration connection; check the source and device.Device-specific
Sources
Sources (1)

Yamaha PX10/PX8/PX5/PX3 SPEAKERS B NL4 output

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

As channel A.

  • P128 speakON 4-pole — **Agree** on contact names and on the Yamaha PX mapping (channel A socket: 1± = A, 2± = B; channel B socket: 1± = B, 2± not connected) and Neutrik's bi-amp suggestion (1± LF, 2± HF) — A also records Neutrik's stereo suggestion.
  • Neutrik PG p. 16 shows a bridged-mono example, but the extracted text pairs 1+ to speaker '+' and 1- with 2+ to speaker '-' in a way that could not be resolved from text alone; no device manual for bridge mode on speakON was retrieved.
  • Only the Yamaha PX series was checked.
4-pole speakON terminal-designation referenceAs channel A.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1+: B+ (device_specific)1+1-: B- (device_specific)1-2+: (not connected) (not_connected)2+2-: (not connected) (not_connected)2-powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Yamaha PX10/PX8/PX5/PX3 SPEAKERS B NL4 output — source-scoped contact map
PinSignalWhat it doesStatus
1+B+Control, detection or configuration connection; check the source and device.Device-specific
Sources
1-B-Control, detection or configuration connection; check the source and device.Device-specific
Sources
2+(not connected)Not connected or absent in this named wiring.Not connected
Sources
2-(not connected)Not connected or absent in this named wiring.Not connected
Sources
Sources (1)

Neutrik NL4MP contact designations (no application)

View and evidence limits

Neutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.

  • P128 speakON 4-pole — **Agree** on contact names and on the Yamaha PX mapping (channel A socket: 1± = A, 2± = B; channel B socket: 1± = B, 2± not connected) and Neutrik's bi-amp suggestion (1± LF, 2± HF) — A also records Neutrik's stereo suggestion.
  • Neutrik's suggestion page shows a bridged-mono 'M' socket (left 1+/1-, right 2+/2-) and speaker-side wiring (1+ to coil +, 1- and 2+ to coil -); it is a suggestion, not a device specification, and was not recorded as a variant.
  • Neutrik suggests left on 1+/1- and right on 2+/2- for stereo on one NL4; recorded only as a note.
  • Only Yamaha PX was established; other amplifiers may route channels differently.
4-pole speakON terminal-designation referenceNeutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1+: 1+ (single_source)1+1-: 1- (single_source)1-2+: 2+ (single_source)2+2-: 2- (single_source)2-powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Neutrik NL4MP contact designations (no application) — source-scoped contact map
PinSignalWhat it doesStatus
1+1+Control, detection or configuration connection; check the source and device.Single source
Sources
1-1-Control, detection or configuration connection; check the source and device.Single source
Sources
2+2+Control, detection or configuration connection; check the source and device.Single source
Sources
2-2-Control, detection or configuration connection; check the source and device.Single source
Sources
Sources (1)

Yamaha PX10/PX8/PX5/PX3 SPEAKERS A (channel A) NL4MD output

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

Neutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.

  • P128 speakON 4-pole — **Agree** on contact names and on the Yamaha PX mapping (channel A socket: 1± = A, 2± = B; channel B socket: 1± = B, 2± not connected) and Neutrik's bi-amp suggestion (1± LF, 2± HF) — A also records Neutrik's stereo suggestion.
  • Neutrik's suggestion page shows a bridged-mono 'M' socket (left 1+/1-, right 2+/2-) and speaker-side wiring (1+ to coil +, 1- and 2+ to coil -); it is a suggestion, not a device specification, and was not recorded as a variant.
  • Neutrik suggests left on 1+/1- and right on 2+/2- for stereo on one NL4; recorded only as a note.
  • Only Yamaha PX was established; other amplifiers may route channels differently.
4-pole speakON terminal-designation referenceNeutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1+: A+ (device_specific)1+1-: A- (device_specific)1-2+: B+ (device_specific)2+2-: B- (device_specific)2-powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Yamaha PX10/PX8/PX5/PX3 SPEAKERS A (channel A) NL4MD output — source-scoped contact map
PinSignalWhat it doesStatus
1+A+Control, detection or configuration connection; check the source and device.Device-specific
Sources
1-A-Control, detection or configuration connection; check the source and device.Device-specific
Sources
2+B+Control, detection or configuration connection; check the source and device.Device-specific
Sources
2-B-Control, detection or configuration connection; check the source and device.Device-specific
Sources
Sources (1)

Yamaha PX10/PX8/PX5/PX3 SPEAKERS B (channel B) NL4MD output

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

Neutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.

  • P128 speakON 4-pole — **Agree** on contact names and on the Yamaha PX mapping (channel A socket: 1± = A, 2± = B; channel B socket: 1± = B, 2± not connected) and Neutrik's bi-amp suggestion (1± LF, 2± HF) — A also records Neutrik's stereo suggestion.
  • Neutrik's suggestion page shows a bridged-mono 'M' socket (left 1+/1-, right 2+/2-) and speaker-side wiring (1+ to coil +, 1- and 2+ to coil -); it is a suggestion, not a device specification, and was not recorded as a variant.
  • Neutrik suggests left on 1+/1- and right on 2+/2- for stereo on one NL4; recorded only as a note.
  • Only Yamaha PX was established; other amplifiers may route channels differently.
4-pole speakON terminal-designation referenceNeutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1+: B+ (device_specific)1+1-: B- (device_specific)1-2+: (not connected) (not_connected)2+2-: (not connected) (not_connected)2-powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Yamaha PX10/PX8/PX5/PX3 SPEAKERS B (channel B) NL4MD output — source-scoped contact map
PinSignalWhat it doesStatus
1+B+Control, detection or configuration connection; check the source and device.Device-specific
Sources
1-B-Control, detection or configuration connection; check the source and device.Device-specific
Sources
2+(not connected)Not connected or absent in this named wiring.Not connected
Sources
2-(not connected)Not connected or absent in this named wiring.Not connected
Sources
Sources (1)

Neutrik wiring suggestion: bi-amp on one NL4 cable

View and evidence limits

Neutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.

  • P128 speakON 4-pole — **Agree** on contact names and on the Yamaha PX mapping (channel A socket: 1± = A, 2± = B; channel B socket: 1± = B, 2± not connected) and Neutrik's bi-amp suggestion (1± LF, 2± HF) — A also records Neutrik's stereo suggestion.
  • Neutrik's suggestion page shows a bridged-mono 'M' socket (left 1+/1-, right 2+/2-) and speaker-side wiring (1+ to coil +, 1- and 2+ to coil -); it is a suggestion, not a device specification, and was not recorded as a variant.
  • Neutrik suggests left on 1+/1- and right on 2+/2- for stereo on one NL4; recorded only as a note.
  • Only Yamaha PX was established; other amplifiers may route channels differently.
4-pole speakON terminal-designation referenceNeutrik contact designations 1+, 1-, 2+, 2-; BDA 458 shows the NL4MP from the rear (tab) side. Do not transfer positions to the mating face.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1+: Low frequency + (single_source)1+1-: Low frequency - (single_source)1-2+: High frequency + (single_source)2+2-: High frequency - (single_source)2-powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Neutrik wiring suggestion: bi-amp on one NL4 cable — source-scoped contact map
PinSignalWhat it doesStatus
1+Low frequency +Control, detection or configuration connection; check the source and device.Single source
Sources
1-Low frequency -Control, detection or configuration connection; check the source and device.Single source
Sources
2+High frequency +Control, detection or configuration connection; check the source and device.Single source
Sources
2-High frequency -Control, detection or configuration connection; check the source and device.Single source
Sources
Sources (1)

What is not established

This field note does not approve a connection, publish a pinout or provide a measured template. Use the linked source scope and the checklist as a documentation starting point.

Your next step

Move from the form to the requirement.

Read the engineering reference Source-scoped details, orientation and explicit unknowns.Work through a connection Choose your task before deciding on a cable.Explore this evidence trail Inspect the claims and their dependencies. (private workspace)

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

Back to first citation ↑
C128ASource checked · pending review

Neutrik NL4FXX-W-S is a four-contact speakON connector.

Neutrik · NL4FXX-W-S four-pole speakON ↗

Locator: Product; Electrical / contact count; Attention
Access: public page. No bi-amping layout, wire gauge, mating approval for other families or safe live-disconnection claim.

S103: full source recordInspect review dependencies → (private workspace)

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval. Next review due 2027-01-01.

Back to first citation ↑
C128BSource checked · pending review

Neutrik excludes use as an AC mains or power-supply connector.

Neutrik · NL4FXX-W-S four-pole speakON ↗

Locator: Product; Electrical / contact count; Attention
Access: public page. No bi-amping layout, wire gauge, mating approval for other families or safe live-disconnection claim.

S103: full source recordInspect review dependencies → (private workspace)

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval. Next review due 2027-01-01.

Back to first citation ↑
C128DSource checked · pending review

Neutrik explicitly excludes a four-pole cable connector from its NL2MPXX two-pole chassis connector.

Neutrik · NL2MPXX two-pole chassis connector exclusion ↗

Locator: Product description: does not intermate with the 4-pole cable connector.
Access: public page. Named example only. No universal compatibility or publication approval. Raw-byte acquisition status is recorded separately.

S496: full source recordInspect review dependencies → (private workspace)

Claim scope: Named chassis exclusion; the two-to-four cable/chassis relationship is not reciprocal.. Next review due 2027-01-09.

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Compare look-alikes: Two-pole versus four-pole speakON · 2-, 4- and 8-pole speakON

Candidate selection does not confirm the identity or capabilities of your physical item.

Evidence behind this page

Scope first. Source second. Approval separate.

2 linked sources · 3 scoped claims · 0 sources with inspection/access flags.

Page scope: consumer_reference_expansion

Assessment 2026-10-22 · earliest scheduled source review 2027-01-01. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 2 source scopes, access limits and dates

S103 · NL4FXX-W-S four-pole speakON

Neutrik · Manufacturer / product-owner domain · inspected 2026-10-03 · due 2027-01-01

Within inspection window

Scoped support: Four-contact speakON loudspeaker connector and its no-mains boundary.

Not established / limitations: No bi-amping layout, wire gauge, mating approval for other families or safe live-disconnection claim.

Locator: Product; Electrical / contact count; Attention

S496 · NL2MPXX two-pole chassis connector exclusion

Neutrik · Manufacturer / product-owner domain · inspected 2026-10-11 · due 2027-01-09

Within inspection window

Scoped support: Named two-pole chassis example; not a claim about every speakON receptacle.

Not established / limitations: Named example only. No universal compatibility or publication approval. Raw-byte acquisition status is recorded separately.

Locator: Product description: does not intermate with the 4-pole cable connector.

Trace 3 claims to their source records

C128A · P128

Neutrik NL4FXX-W-S is a four-contact speakON connector.

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval

Source links: S103 · Evidence trail → (private workspace)

C128B · P128

Neutrik excludes use as an AC mains or power-supply connector.

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval

Source links: S103 · Evidence trail → (private workspace)

C128D · P128

Neutrik explicitly excludes a four-pole cable connector from its NL2MPXX two-pole chassis connector.

Claim scope: Named chassis exclusion; the two-to-four cable/chassis relationship is not reciprocal.

Source links: S496 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.