XLR Cable to Jack: Wiring XLR to TRS and TS Jacks
Quick Answer / Summary: An XLR to TRS jack is balanced: XLR pin 2 goes to the tip, pin 3 to the ring, and pin 1 to the sleeve. An XLR to TS jack is unbalanced: XLR pin 2 goes to the tip and pins 1 and 3 both go to the sleeve, accepting a 6 dB level loss. Match the adapter to the jack type rather than the other way round, keep runs short when the connection is unbalanced, and confirm continuity on all three contacts after termination.
Converting between an XLR cable and a jack is routine in mixed systems, but the correct wiring depends entirely on which jack you have. A tip-ring-sleeve jack is balanced and accepts the same three signals as an XLR; a tip-sleeve jack is unbalanced and can only take one signal plus a return. Wiring a balanced XLR into a TS jack by copying the XLR pinout produces hum or silence, because one signal leg ends up shorted to ground. This guide sets out the correct wiring for each case, the level differences to expect, and the checks that confirm the adapter is right.
TRS Jacks Are Balanced and Map Directly
A tip-ring-sleeve jack has three contacts, so it can carry a balanced pair plus a shield. The mapping is direct: pin 2 to tip, pin 3 to ring, pin 1 to sleeve. Signal level is the same as the XLR side, so a line-level output can drive a line-level TRS input without any change in gain. This is the straightforward case and the one to prefer whenever the equipment offers the choice.
Why the Mapping Is Not Arbitrary
The tip carries the in-phase signal because that is the convention, and the ring carries the inverted leg. Reversing tip and ring still passes audio to a balanced receiver but inverts polarity relative to every other channel, which shows up as cancellation when sources are combined. Keeping the convention consistent across a system avoids chasing phantom phase faults.
Patch Points and Insert Cables
Insert cables use a TRS jack to carry both a send and a return, splitting to two connectors at the other end. Those are not the same as an XLR to TRS adapter, and they should never be substituted for one. Identify the cable by its function, not by the connector count.
TS Jacks Are Unbalanced and Need Care
A tip-sleeve jack has only two contacts, so the balanced pair cannot be preserved. The usual rule is to take pin 2 to the tip and tie pins 1 and 3 to the sleeve, which shorts the inverted leg to the shield and converts the connection to unbalanced. Level falls by roughly 6 dB, and the noise rejection of the balanced link is lost from that point onward, so keep the unbalanced section as short as the layout allows.
The Common Wiring Mistake
Wiring pin 2 to tip and pin 3 to sleeve while leaving pin 1 unconnected, or tying pin 3 to the shell instead of pin 1, produces a cable that hums or that silences the source. The shield must remain the return, and both the shield and the inverted leg must land on the sleeve in a TS adapter.
Impedance and Level Changes
Converting to unbalanced shifts the load the source sees. Line-level outputs normally handle this without difficulty; high-impedance instrument paths are more sensitive and are better kept on their own connection rather than routed through an adapter chain.
Adapters, Cables and Which to Prefer
A purpose-built cable is better than a chain of adapters, because every additional joint adds contact resistance and a mechanical weak point. Where an adapter is unavoidable, choose one with a metal body and a solid sleeve connection, then test it. Document the direction of conversion so that a technician does not reverse the adapter later and invert the signal path.
Bidirectional Use of Adapters
An XLR to TRS adapter can be used in either direction for balanced connections, but the labels should state which end is intended for a source. For unbalanced TS adapters, the direction matters more, because the 6 dB loss applies whichever way it is used and the level may no longer suit the destination.
Testing After Termination
Check continuity from each XLR pin to the correct jack contact, confirm no bridge between the tip and the ring on a TRS adapter, and confirm that pins 1 and 3 are deliberately common on a TS adapter. Then flex the cable at both ends while monitoring, since the small connector bodies used on adapters are a common site of shield breaks.
XLR to Jack Wiring Reference
| Destination | XLR Pin 2 | XLR Pin 3 | XLR Pin 1 | Result |
|---|
| TRS jack (balanced) | Tip | Ring | Sleeve | Balanced link, no level change |
| TRS jack with tip and ring reversed | Ring | Tip | Sleeve | Audio passes but polarity is inverted |
| TS jack (unbalanced) | Tip | Sleeve (common with pin 1) | Sleeve | Unbalanced, about 6 dB lower, no noise rejection |
| TS jack, pin 3 left unconnected | Tip | Not connected | Sleeve | Weak or silent output, hum likely |
| TS jack, shield to shell only | Tip | Sleeve | Shell | Hum and unstable return path |
| Any adapter | Confirm by continuity | Confirm by continuity | Confirm by continuity | Verify on all three contacts before use |
Real-World Application Scenarios
Typical scenarios: feeding a mixer output into a TRS line input on an interface; connecting a balanced source to an unbalanced guitar amplifier input in a home studio; adapting a stage box output to a house system that uses jacks; building insert adapters for a console; and mixed-format racks where the same source must reach both XLR and jack destinations.
Recommended Internal Resources
Editorial Note: Internal linking recommendation: (1) Balance theory – https://zh-zong.com/xlr-balanced-audio-cable-guide/ (anchor: balanced XLR audio cable and why unbalancing loses noise rejection); (2) Related adapter guide – https://zh-zong.com/xlr-to-3-5mm-cable-guide/ (anchor: XLR to 3.5mm cable guide for smaller jack formats); (3) Connector reference – https://zh-zong.com/xlr-connector-cable-guide/ (anchor: XLR connector cable pinout and termination rules); (4) Conversion – https://zh-zong.com/contact/ (anchor: contact the sales engineering team for XLR to jack adapter and cable programs specifying TRS or TS at each end).
Frequently Asked Questions (FAQ)
Q: How do I wire an XLR to a TRS jack?
A: Pin 2 to tip, pin 3 to ring and pin 1 to sleeve. That preserves the balanced connection with no level change. If the audio is inverted relative to other channels, the tip and ring have been swapped.
Q: Can I connect an XLR to a TS jack?
A: Yes, but the connection becomes unbalanced. Take pin 2 to the tip and tie both pins 1 and 3 to the sleeve. Expect roughly 6 dB of level loss and no common-mode rejection, so keep that section short.
Q: Why is my XLR to jack cable silent?
A: The most common cause is pin 3 left unconnected while pin 1 goes to the shell, or the shield not being used as the return. Confirm continuity on all three contacts and check that pins 1 and 3 are intentionally common on a TS adapter.
