We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

What Is a Subwoofer Filter?

By Troy Holmes
Updated: May 16, 2024

Stereo speakers are designed to optimally play at specific frequencies. Subwoofer speakers play extremely low frequencies, between 20hz and 200hz. A subwoofer filter is an electronic device that removes high frequencies from radio transmissions that are sent to subwoofer speakers. This filter is connected between the speaker and stereo receiver speaker wires.

Subwoofer speakers are large, thick speakers designed to play low-frequency bass. These speakers will become distorted and torn if high-frequency music is played through them. A subwoofer filter is special audio device that filters out high frequency sounds, which are above 200hz. This filter only passes low bass frequencies through the speaker wire.

Low-frequency bass is best heard through speakers that are designed to play loud low frequencies. A subwoofer filter is often built inside a subwoofer speaker box. This filter ensures high frequencies are blocked and not transmitted into the speaker.

Many modern stereo receivers have built-in subwoofer output channels. These audio receivers send only low-frequency signals to the subwoofer speaker. This ensures high-frequency tones are restricted from the speaker.

The subwoofer filter uses a crossover filter that detects high-frequency music. This type of filtering device is often used in music studios to make dynamic music sounds. The crossover filter is made with electric wire that can delete high or low notes as necessary.

It is important that a stereo only use one low-frequency filter. Most powered subwoofers have built-in subwoofer filters that can conflict with the crossover filter of a high-end receiver. A powered subwoofer configuration is best for cars and stereos that don't have subwoofer outputs. This ensures the stereo and speakers are not fighting over the crossover frequency.

A subwoofer filter is important because it keeps the speakers clean and clear. Speakers are basically dumb components that play all frequencies sent through the speaker wire. The filter protects the speaker by ensuring higher frequencies are blocked before they can damage the equipment.

There are several types of subwoofer filters available. These range from basic wire spools to more complex crossover switches. Switches typically cost more than standard filters but allow the stereo to be more precisely calibrated to match the attached speakers. Most high-end competition stereos use a crossover component configuration.

EasyTechJunkie is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.

EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.