Cables and connectors are the least glamorous part of any sound system and one of the most important. A single failing cable can stop a show, add hum to a recording or damage equipment. Choosing the right cables and connectors, and looking after them, keeps every signal clean and every system reliable. This guide explains the main types and how to choose them.
Balanced and unbalanced signals
An unbalanced cable has one signal conductor and a shield. It is used for instruments, consumer equipment and short connections. A balanced cable has two signal conductors plus a shield; the signal is carried in a way that lets the receiving input cancel noise picked up along the cable. Balanced connections are used for microphones and professional line-level signals, especially over long runs.
Common audio connectors
XLR
XLR connectors are the standard locking connectors for microphones and balanced line signals. Three-pin XLR is used for audio, while five-pin XLR is used for DMX lighting and some other applications. XLR connectors are also used for AES/EBU digital audio, which should run on 110-ohm digital audio cable.
Jack
Jack connectors come in 6.35 mm and 3.5 mm sizes. TS (tip-sleeve) jacks carry unbalanced mono signals such as guitars, while TRS (tip-ring-sleeve) jacks carry balanced mono or stereo signals such as headphones and studio line connections.
RCA
RCA (phono) connectors are used on consumer and DJ equipment for unbalanced line signals and some digital signals.
Speaker connectors
Locking speaker connectors carry high-current amplifier signals to passive loudspeakers safely, with no exposed contacts and a secure lock. Never use instrument cables for loudspeakers.
Digital, network and video connections
- Network: rugged RJ45 connectors and Cat5e or better cable for Dante, AVB and AES67 networks
- Fibre: fibre optic cables for long distances and immunity from interference
- BNC: 75-ohm BNC connectors for word clock, coaxial MADI and SDI video
- Optical: TOSLINK cables for ADAT and S/PDIF optical digital audio
Power connectors
Locking power connectors keep mains connections secure on stage and in racks, and allow equipment to be linked safely where the manufacturer permits.
Multicores and stage boxes
Multicores combine many channels in one cable, with a stage box at one end and fan-out tails or connectors at the other. They tidy up stages and studios. In networked systems, a single network or fibre cable can replace a heavy analog multicore.
What makes a good cable
- Conductors: suitable size for the signal; speaker cables need heavier conductors for longer runs and higher power
- Shielding: effective shielding against interference for microphone and line cables
- Flexibility: stage cables should coil easily and resist kinking; installation cables can be stiffer
- Connectors: quality connectors with secure strain relief and good contacts
- Jacket: durable outer jacket, with outdoor or special jackets where needed
Making your own cables
Bulk cable and connectors let installers and technicians make cables to exact length. Use connectors matched to the cable diameter, follow the correct pin wiring, solder or crimp carefully and test every cable before use. Colour boots and labels make systems easier to manage.
Caring for cables
- Coil cables using the over-under method to prevent twisting
- Do not pull cables by the cable; grip the connector
- Keep connectors clean and covered when not in use
- Test cables regularly and repair or replace faulty ones
- Label lengths and channels
Common mistakes to avoid
- Using instrument cables or thin cable for loudspeakers
- Using standard microphone cable for AES/EBU digital audio over long runs, instead of 110-ohm digital cable
- Choosing connectors that do not match the cable diameter, leading to weak strain relief
- Wrapping cables tightly around the elbow, which damages conductors over time
Choosing cable lengths
Plan lengths before buying. Cables that are too short strain connectors and equipment, while cables that are far too long create clutter and trip hazards. Many engineers keep a range of standard lengths for microphones, a few longer cables for distant positions and short patch cables for racks. Clearly marked lengths and colours speed up setup and troubleshooting.
Testing cables
A cable tester checks each conductor for continuity, shorts and wiring errors in seconds. Testing new and repaired cables before they go into service, and testing the whole stock regularly, prevents faults during shows and sessions. See our audio test equipment for portable testers.
Buying cables and connectors from Shivansh Electronics
Shivansh Electronics, Kolkata, West Bengal, India supplies genuine products only, exactly as the manufacturers build and specify them. Every product page has a Visual Guide data sheet with the manufacturer's official specifications, so you can compare models side by side before you decide. Our personnel can help you shortlist options for your room, venue or project, explain how the specifications apply to your setup and suggest the accessories you will need. You are welcome to visit our showroom in Dhakuria, Kolkata, to discuss your requirements in person.
Brands to explore
Shivansh Electronics carries cables and connectors from NEUTRIK, SEETRONICS, KASPER, TELEFUNKEN, NEUMANN and ECLER.
Frequently asked questions
Why does my system hum?
Hum is often caused by ground loops or unbalanced connections. Balanced cables, correct grounding and DI boxes with ground lift can help.
How long can a microphone cable be?
Balanced microphone cables can run long distances in professional systems. For very long runs or many channels, consider digital or network audio.
Can I use network cable for analog audio?
Some systems use twisted-pair cable for analog audio with suitable adapters, but standard microphone cable is preferred for most applications.
Can your personnel help with a wiring project?
Yes. Visit our showroom in Dhakuria, Kolkata, or call +91 89818 07755 or +91 91477 00677.