Multicore cables

Multicore cables for organised analogue audio wiring

A multicore cable brings several signal pairs together beneath one outer jacket. It can connect a stage box to a mixing console, link a studio patchbay with equipment, or organise parallel audio circuits in a permanent installation. Each channel remains an independent electrical connection. The cable makes the physical route easier to manage, but it does not mix signals, amplify microphones or convert analogue audio into a digital network.

Start with a connection plan rather than a preferred cable diameter. Identify every source, destination, signal type and connector before choosing the number of pairs. The word multicore describes a broad construction format: an analogue audio multicore, a multichannel speaker cable and a cable designed for digital interfaces are not automatically interchangeable. Matching the electrical application is the first step; pair count and mechanical dimensions come next.

Counting pairs, channels and returns

A conventional balanced analogue mono circuit uses one signal pair and its intended screening arrangement. A stereo device with separate balanced left and right outputs therefore needs two pairs. Monitor returns, processor connections and additional feed lines must also be counted separately. Twelve microphone inputs and four independent balanced returns already occupy sixteen pairs. Counting instruments alone can be misleading because one instrument or playback device may provide several outputs.

Reserve channels should reflect likely expansion. A future stereo player needs two spare circuits, while an extra microphone needs another one. However, a larger cable also means more weight, a wider jacket and more demanding cable entries. Choosing the highest available pair count without a plan can make a compact system unnecessarily cumbersome. A simple schedule showing assigned channels and deliberate spares makes the choice between sixteen, twenty-four and thirty-two pairs more transparent.

VDC models listed in this category

The category includes VDC 268216060, 268224060 and 268232060, corresponding to sixteen, twenty-four and thirty-two pairs. The official Van Damme Blue Series Studio Grade table gives their outside diameters as 16.30, 20.80 and 22.10 mm respectively. Those dimensions matter when selecting box entries, protective sleeving and installation openings. Check the exact product code, selling unit and required length before ordering.

The manufacturer describes this as an analogue series with individually jacketed pairs, numbering and colour identification. These features help with termination and channel tracing, but every completed circuit still needs testing. A maximum factory reel length listed in a cable specification is not a universal maximum operating distance for an audio connection. The usable route must be assessed with the source, receiving equipment and relevant electrical characteristics of the complete system.

Screening and balanced signal paths

In a multipair assembly, the construction of each pair matters as much as the shared outer jacket. Individual screening supports the intended separation and termination of the circuits. During preparation, keep pair identification intact and avoid accidental bridges between nearby connector contacts. A screen must not be confused with a signal conductor. The point where the main jacket ends and the individual tails begin needs both careful electrical work and adequate mechanical protection.

Balanced operation depends on the source output, the cable connection and the receiving input together. A multicore does not make an unbalanced output balanced. A passive guitar, portable player or other unsuitable source may need an appropriate DI box or interface before entering the stage system. Screening also does not remove the need to plan sensible routes around mains wiring, transformers and other potential interference sources. Treat the cable as one part of the complete installation.

Bulk cable versus a completed stage snake

Unterminated multipair cable is a component for building a system. A finished stage snake additionally requires a box or panel, connectors, breakout protection, mechanical restraint and completed wiring. Confirm whether a listing refers to a metre of cable, an entire reel or a terminated assembly. The term multicore in a product name does not by itself mean that every channel already has an XLR connector fitted.

Tail lengths should follow the physical layout of the equipment. Short tails can place strain on connectors and restrict future rearrangement; excessively long tails create clutter behind a rack. Draw the panel positions and cable entry points before deciding how each group should fan out. Identification must remain readable after sleeves and supports are installed. Good labelling is particularly useful when a technician needs to change one connection without disturbing the rest of the assembly.

Connector compatibility and channel documentation

Record the connector type, connector configuration, channel number and contact assignment at each end. Matching the appearance of a multipin connector does not prove that two devices use the same pinout. This is especially relevant to studio multichannel ports and breakout assemblies made for different equipment families. Check equipment documentation and the assembly drawing instead of assuming that a plug which physically fits must carry the right signals.

A passive pair does not inherently choose a transmission direction, but the installed connectors and system design determine which circuits are inputs and which are returns. Mark those groups clearly at both ends. A channel schedule showing number, source, destination and termination makes soundchecks and fault finding easier. Keep the current version with the system so another engineer can understand the connections without relying on instructions from the person who originally assembled it.

Permanent installation and mobile use

For a studio installation, consider cable tray access, panel servicing and the ability to replace equipment later. A mobile system adds concerns such as coiling, transport weight, connector protection and strain relief at the stage box. Flexible construction does not mean a cable can be folded around any sharp edge. Check the specified bend requirements and operating conditions for the chosen series, particularly where a thick multicore must turn inside a shallow rack.

Jacket requirements need separate attention. The referenced Blue Series documentation describes fixed installations where LSZH cable is not required, so it should not be advertised as a universal low-smoke, zero-halogen solution. If a building project specifies particular smoke, fire, outdoor or location requirements, verify compliance for the exact product before installation. Jacket colour or membership of a professional product family is not evidence that a cable meets those project requirements.

Testing a completed multipair assembly

Before connecting the working equipment, check every circuit against the drawing. Confirm continuity, the absence of unwanted shorts, correct numbering and secure mechanical retention. Testing only the first and last channels leaves the rest unverified. A written checklist with a result for each channel is useful for a large assembly and provides a clear record after repairs. If a tail is repaired, inspect nearby connections that may have been disturbed during the work.

Follow the wiring checks with actual signal tests in the intended configuration. Check every input and return for the expected level and unwanted interference. When a symptom affects only one circuit, compare the source, connector tail, pair and receiving input in a controlled sequence. This helps distinguish a cable problem from console routing, a damaged connector or a source fault. Keep the test results alongside the wiring schedule for future maintenance.

A practical studio rack example

Suppose eight balanced interface outputs must feed a patchbay and eight separate circuits must return to the interface inputs. That is sixteen independent mono paths, not eight bidirectional audio channels. After counting the pairs, check the interface multipin wiring, the patchbay connection scheme and the intended screen terminations. If the patchbay uses normalled connections, document that setting separately because it describes the panel routing rather than a property of the multicore cable.

Measure the route along its actual path through the rack, allowing a justified service loop for equipment movement or replacement. Support the main cable so its weight does not hang from the individual connector contacts. Coordinate the tail numbers with the interface input and output labels. This approach makes later expansion a matter of reading a reliable diagram rather than tracing every pair again before deciding which connection is available.

Frequently asked questions

Does an analogue multicore replace a digital stage box? No. A digital stage box contains active electronics and operates with a particular protocol. A passive cable does not provide conversion, remote preamp control or network routing.

Can any pair carry AES or DMX? Two conductors alone do not establish compatibility. Digital interfaces require suitable electrical characteristics, correct terminations and compliance with the connected equipment requirements. Do not automatically describe an analogue series as a digital cable.

Can a signal multicore feed passive loudspeakers? An amplifier output requires appropriate speaker cable, conductor size, connectors and load suitability. A signal multipair cable is not a universal substitute for that application.

What information is needed before ordering? Prepare the number of independent circuits, route length, planned spares, connector requirements and installation conditions. For a finished assembly, also define tail lengths, channel labels and the complete wiring schedule.