Balanced Microphone Cable: How Shielding and Twisted-Pair Construction Protect Audio Signals

8 月 14, 2026

What Makes a Microphone Cable “Balanced”

A balanced audio connection sends the same signal on two conductors, with the second conductor carrying an inverted copy. The receiving device subtracts the two, which cancels noise picked up identically on both wires and doubles the signal. This is why professional microphone and line-level runs use balanced wiring with XLR connectors.

The cable itself supports this: a two-core construction with a shield. One core carries the positive (hot) signal, the other the negative (cold), and the shield — connected to pin 1 of the XLR — carries the ground and drains interference.

How Shielding Works

Shielding wraps the signal cores in a conductive layer that blocks or drains electromagnetic interference. Two common approaches are:

Foil shielding: a thin aluminium layer wrapped around the cores. Good high-frequency coverage, lightweight, cost-effective.
Copper braid shielding: a woven mesh of copper strands. Mechanically strong, handles flexing and repeated coiling well, and provides a solid ground path.

Many professional cables combine both: foil plus a dense copper braid. The LBSDMX audio signal cable series uses this combination — PE insulation, foil and dense copper shielding — to protect balanced microphone and line-level signals.

Conductor Size and Cable Capacitance

The conductor size (in mm²) affects how much signal loss occurs over distance. For standard microphone runs, common sizes range from 2 × 0.25 mm² for short leads and patch cables up to 2 × 0.50 mm² for longer, more demanding runs.

In the LBSDMX microphone cable range, the braiding structure tells you the conductor configuration:

Model	Braiding (cores × conductor)	Typical use
LBSDMX64025	64 / 2 × 0.25	Short mic leads, patch
LBSDMX96035	96 / 2 × 0.35	Standard mic runs
LBSDMX128035	128 / 2 × 0.35	Balanced mic, longer runs
LBSDMX144050	144 / 2 × 0.50	Heavy-duty, long runs

Specifications shown are from the published LBS product pages.

Jacket and Temperature Rating

Microphone cable for stage work needs a jacket that survives repeated coiling, foot traffic and road cases. The LBSDMX series uses an elastic PVC (EPVC MATT) jacket, available in black, brown or dark green, with an outside diameter of 6.3 mm and an operating range of -20°C to 70°C.

What to Specify for Your Project

When ordering microphone cable for an OEM or installed project, confirm:

Conductor size based on run length — longer runs benefit from larger conductors.
Jacket colour and printing — brand name, model and specification can be printed on the jacket for OEM orders.
Termination — XLR pre-assembly is available on request.
Packaging — 100 m rolls, 305 m drums or custom lengths.

LBS supports OEM/ODM orders on the LBSDMX microphone cable series: custom jacket colours, brand/model printing, custom lengths and packaging. Contact LBS for OEM microphone cable for project details.

FAQ

Is LBSDMX128035 a balanced microphone cable?

Yes. It is a two-core shielded construction with PE insulation, foil and dense copper shielding, designed for balanced XLR microphone and line-level audio signals.

Can I use a microphone cable for line-level signals?

Yes. A shielded two-core balanced cable works for line-level runs such as mixer sends and stage box returns as well as microphone signals.

What is the difference between foil and braid shielding?

Foil gives broad high-frequency coverage; copper braid adds mechanical strength and a solid ground path. Many professional cables combine both, as the LBSDMX series does.

Can LBS custom-print my brand on microphone cable?

Yes, LBS supports OEM/ODM orders: custom jacket colours, brand/model printing, custom lengths and packaging. Contact LBS for project details.