Most home subwoofers use a single RCA cable, but pro subwoofers and many higher-end systems use XLR instead. The balanced XLR connection is quieter over distance and locks in place, which is why it shows up on powered subs in studios and live sound.

XLR Subwoofer Cable: The Balanced Way to Feed a Sub

Quick Answer / Summary: An XLR subwoofer cable is a balanced three-conductor cable that connects a mixer, processor, or AV preamp to a powered subwoofer’s XLR input, rejecting hum and interference over long runs better than an RCA cable.

What an XLR Subwoofer Cable Is

An XLR subwoofer cable is a balanced cable with three-pin XLR connectors on one or both ends. It carries the low-frequency signal on two conductors plus a shield, which lets the receiving amplifier cancel noise that enters along the run.

Balanced three-conductor

The balanced design is the key difference from a standard RCA subwoofer cable. RCA is unbalanced, with a single signal conductor and a shield, so it is more prone to hum and interference, especially on long runs.

XLR connectors also lock into place, so a cable is much less likely to pull out of a subwoofer that gets moved or vibrates during use.

XLR vs RCA for Subwoofers

For a short run in a home theater, an RCA subwoofer cable works perfectly well, and it is the connector most AV receivers use for the sub or LFE output.

Long runs

For long runs, professional systems, or environments with lots of electrical noise, XLR is the better choice because the balanced connection rejects hum that an unbalanced RCA cable would pick up.

Many powered subwoofers offer both RCA and XLR inputs. If your preamp, mixer, or processor has XLR outputs, using an XLR subwoofer cable is the cleanest option.

Connector Combinations

The most common XLR subwoofer cable is XLR-to-XLR, running from an XLR output on a mixer, crossover, or processor to the XLR input on the powered sub.

If one end is XLR and the other is RCA, use a purpose-built XLR-to-RCA cable or a balancing adapter, keeping in mind that the RCA end is unbalanced and should be kept short.

Match the gender of the connectors: XLR outputs are usually male and inputs female, so a standard XLR microphone-style cable with a female end at the output and male end at the input is typical.

Wiring the XLR Subwoofer Cable

Run the XLR cable from the subwoofer or crossover output to the powered subwoofer input, and lock the connectors in place. Keep the run tidy and away from power cords.

If you are daisy-chaining subs, use the thru or link XLR output on the first sub to feed the next with a short XLR cable, keeping the signal balanced the whole way.

Set the subwoofer input to XLR if it has a switch, then bring the level up and listen for hum; a balanced XLR run should be essentially silent.

XLR vs RCA Subwoofer Cable

Real-World Application Scenarios

A live sound engineer runs XLR cables from the mixer aux send to two powered subwoofers; a studio uses XLR-to-XLR cables from the monitor controller to a pair of powered subs; a home theater owner with an XLR-equipped processor and sub upgrades from RCA to XLR for a quieter noise floor.

Recommended Internal Resources

• the XLR connector and cable
• how the balanced XLR signal works
• the subwoofer cable guide

See XLR cable for the connector, what is XLR for the balanced concept, and subwoofer cable for the RCA alternative.

Frequently Asked Questions

Do subwoofers use XLR or RCA cables?

Both, home subs usually use RCA while pro and studio subs often use balanced XLR for quieter long runs.

Is XLR better than RCA for a subwoofer?

For long runs and noisy environments, yes, because XLR is balanced and rejects hum, while RCA is unbalanced.

Can I use a microphone cable as an XLR subwoofer cable?

Yes, a standard balanced XLR microphone cable works as an XLR subwoofer cable.

How do I connect an XLR sub to an RCA output?

Use an XLR-to-RCA cable or adapter, keeping the RCA end short since that side is unbalanced.