A crossover splits an audio signal by frequency and sends each piece to the driver built to reproduce it. The word covers two genuinely different components depending on what kind of speaker you’re looking at, and mixing them up is the most common confusion here.
Internal Crossovers: Splitting Signal Between Drivers
Inside any speaker with more than one driver, a crossover network divides the incoming signal so the tweeter only receives the highs it can reproduce cleanly and the woofer only receives the lows it can move enough air for. It’s a small circuit of capacitors, inductors and resistors, either passive components in the cabinet or active DSP. Without it, a tweeter fed full-range bass would distort or fail outright, and a woofer fed treble would reproduce it poorly.
42 ranked passive speakers and 11 ranked powered speakers publish this figure, listed as Crossover Frequency, Crossover Points, or Crossovers in the spec table. A two-way bookshelf speaker publishes one number, the point where the woofer hands off to the tweeter, typically 1.5-3kHz, roughly where human hearing is most sensitive to timing errors. A three-way design publishes two, one between woofer and midrange and a second between midrange and tweeter.
The crossover point itself isn’t a quality signal. What matters is execution: how steep the slope is, whether the two drivers stay in phase through the handoff region, and whether the designer measured and corrected for it. None of that shows up in the single published number. A speaker’s own measured frequency response through that region says far more than the crossover figure alone.
Subwoofer Crossovers: A Dial You Set Yourself
A subwoofer’s Crossover field describes something different: a low-pass filter, usually adjustable by the owner, that decides how high the subwoofer’s own output reaches before it hands off to the main speakers. This is a setting you choose based on your main speakers’ own bass extension, not a fixed design decision baked into the product.
6 ranked subwoofers publish an adjustable range, commonly 40-150Hz or similar, often alongside a slope figure in dB/octave describing how sharply the output rolls off past that point. Set it too high and the subwoofer becomes localizable and muddies the main speakers’ own bass; set it too low and it leaves a gap the mains can’t fill. Many AV receivers can also apply their own crossover in the receiver itself, which interacts with whatever the subwoofer’s own dial is set to; the lower of the two effectively wins.
Where To Look Next
For the driver sizes and arrangement a crossover is dividing signal between, see speaker drivers explained. For how a passive speaker’s crossover region interacts with the impedance an amplifier sees, see speaker impedance explained. For subwoofer cabinet types the crossover works alongside, see subwoofer enclosure types explained.
Frequently Asked Questions
What is a speaker crossover? A circuit or DSP function that splits an audio signal by frequency and routes each range to the driver built to handle it, lows to the woofer, highs to the tweeter, and a middle band to a midrange driver on a three-way design. Without it, drivers would receive frequencies they can’t reproduce cleanly.
Is a lower or higher crossover frequency better? Neither is inherently better; it depends on the drivers either side of it. What matters more than the number itself is execution, a clean, in-phase handoff between drivers measured and corrected by the designer, which the published frequency alone doesn’t reveal.
Is a subwoofer’s crossover the same thing as a bookshelf speaker’s crossover? No, despite the shared name. A bookshelf or tower speaker’s crossover is a fixed internal network splitting signal between its own drivers. A subwoofer’s crossover is an adjustable low-pass filter you set yourself, deciding how high the subwoofer plays before handing off to separate main speakers.
What crossover frequency should I set on my subwoofer? Roughly where your main speakers’ own bass extension starts to roll off, so the two overlap rather than leaving a gap or fighting each other. See bass extension explained for reading that figure. If an AV receiver is also applying a crossover, the lower of the receiver’s and the subwoofer’s own setting effectively takes over.
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