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What Is Crossover In Audio? Unveiling the Key to Perfect Sound

by Stuart Charles Black
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Greetings mate and Welcome aboard!

Stuart Charles here, HomeStudioBasics.com helping YOU make sound decisions, so…

What Is Crossover In Audio?

In the context of audio, a crossover refers to an electronic circuit or signal processing technique used to divide an audio signal into different frequency bands and direct those bands to specific speakers or transducers.

Crossovers are commonly used in audio systems, particularly in multi-driver speaker systems, to ensure that each speaker or driver is responsible for reproducing a specific range of frequencies that it can handle most efficiently.

This helps in achieving better sound quality and preventing distortion.

Frequency Division

Audio signals typically consist of a wide range of frequencies, from low bass frequencies to high treble frequencies.

Crossovers are designed to split this range into multiple frequency bands, such as low, mid, and high frequencies.

Speaker Assignment

Once the signal is divided into different frequency bands, each band is sent to a specific speaker or driver designed to handle that range of frequencies effectively.

For example:

    • Low-Frequency Driver (Subwoofer): Handles deep bass frequencies.
    • Mid-Range Driver (Woofer): Handles mid-range frequencies.
    • High-Frequency Driver (Tweeter): Handles high-frequency treble sounds.


Crossovers use filters (usually electronic filters) to ensure that only the intended frequencies are sent to each speaker.

Common types of filters used include high-pass filters, low-pass filters, and band-pass filters.

These filters attenuate frequencies outside their specified range, reducing the risk of damaging speakers and optimizing sound quality.


The output of each driver is then combined to produce the full audio signal.

When done correctly, the result is a well-balanced sound with clear separation of different frequency ranges, preventing distortion and ensuring each driver operates within its optimal range.

Crossovers can be implemented in various ways, including passive crossovers and active crossovers:

Passive Crossovers

These are typically installed between the amplifier and the speakers and use passive components like capacitors, inductors, and resistors to split and filter the audio signal.

Passive crossovers are common in home audio systems.

Active Crossovers

Active crossovers are electronic circuits that are typically placed before the power amplifiers in a system.

They require an external power source and are more flexible in terms of adjustment and customization.

Crossover and Subwoofers

Using a subwoofer to handle the low-end frequencies in an audio setup is a common practice, particularly in scenarios where precision and balance in sound reproduction are essential.

The primary objective is to relieve the main monitors from the task of reproducing deep bass frequencies, allowing them to focus on midrange and high-frequency content.

A key element in this setup is the crossover we discussed, which is essentially a filter that divides the audio signal into different frequency ranges.

The crossover ensures that the subwoofer receives and reproduces only the low frequencies while directing the midrange and high-frequency components to the main monitors.

This division of labor results in several advantages:

Improved Sound Quality

Monitors can produce cleaner and more detailed midrange and high-frequency sounds without the strain of trying to reproduce deep bass, leading to overall better sound quality.

Reduced Distortion

By specializing in their respective frequency ranges, both the subwoofer and the monitors operate within their optimal performance zones, minimizing distortion and enhancing clarity.

Extended Frequency Response

Subwoofers are designed to handle very low frequencies that monitors may struggle with.

This extends the overall frequency response of the audio system, providing a more comprehensive and immersive listening experience.

Greater Precision

By fine-tuning the crossover settings, you can precisely control which frequencies go to the subwoofer and which go to the monitors, allowing for tailored sound reinforcement to suit your preferences or the requirements of your audio content.

In summary, integrating a subwoofer into an audio system with a crossover enhances sound quality, minimizes distortion, and allows each component to excel in its designated frequency range.

This setup is a fundamental strategy for achieving balanced and high-fidelity audio reproduction, whether in a home theater, studio, or live sound environment.


To set up a subwoofer with active speakers, you’ll need four balanced TRS/XLR cables (2 sets).

Start by routing the wires from the outputs of your audio interface directly into the inputs of the subwoofer.

My Universal Audio Volt 2 has TRS outputs. Depending on what the sub has, you’ll either need TRS to TRS or TRS to XLR.

Then, output from the subwoofer into your active monitors via the other set of balanced cables.

A lot of monitors give you the option of TRS or XLR inputs.

This straightforward connection allows the subwoofer to handle the low frequencies, enhancing your audio system’s bass performance without the need for additional complexity.

Closing Thoughts

In the realm of audio, a crossover is a pivotal tool that enables the distribution of audio frequencies to the most suitable speakers or transducers, optimizing sound quality and minimizing distortion.

By employing electronic circuits or signal processing techniques, crossovers divide an audio signal into different frequency bands, permitting each speaker or driver to handle a specific range of frequencies it can reproduce efficiently.

This precision is particularly valuable when main monitors are designed to excel in the midrange and high frequencies but may lack the capacity to capture low frequencies below a certain threshold, such as 40-50 Hz.

For producers and audio enthusiasts seeking to create or experience bass-heavy music or content, the integration of a subwoofer into the audio system becomes essential.

Subwoofers, specially designed to handle deep bass frequencies, significantly extend the overall frequency response of the system.

When coupled with a well-configured crossover, they ensure that the low-end frequencies are accurately represented, enhancing sound quality and providing a more immersive listening experience.

In essence, crossovers and subwoofers work in harmony to achieve a balanced and high-fidelity audio reproduction across the full spectrum, whether in a studio or a home audio setup.

Well, that’s about it for today my friend! I hope you enjoyed this What Is Crossover? Discussion and came away with some valuable insight.

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All the best and God bless,





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