The Tool Desk
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Start with 80 Hz in most home-theater systems
If your system has a powered subwoofer, set the AV receiver’s speaker crossover to 80 Hz, set bass-managed speakers to Small, and set the subwoofer’s low-pass control to LFE, maximum, or bypass. This gives the receiver control of the handoff between the speakers and subwoofer.
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Then refine the setting according to each speaker’s low-frequency capability. As a practical starting rule, choose a crossover approximately 10 Hz above the speaker’s lowest cleanly usable frequency:
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- Very small satellite speakers: approximately 120–150 Hz
- Compact bookshelf, center, or surround speakers: approximately 80–100 Hz
- Larger bookshelf or monitor speakers: approximately 60–80 Hz
- Towers with 4- to 6-inch woofers: approximately 60 Hz
- Capable towers with 8- to 10-inch woofers: approximately 40–60 Hz, or Full Band if the system performs better that way
The correct setting is the one that produces a continuous, natural transition—not necessarily the lowest number available in the receiver menu.
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What the crossover frequency does
The crossover frequency is the point at which the receiver divides bass between a speaker and the subwoofer. Frequencies below the selected point are redirected from a bass-managed speaker channel to the subwoofer, while the speaker handles frequencies above it.
For example, with a crossover set to 80 Hz, the receiver sends the low-bass content below the crossover to the subwoofer and relieves the main, center, or surround speaker of much of that demand. The exact filter behavior depends on the receiver and speaker configuration, so 80 Hz should be treated as a starting point rather than a sharp wall where one component stops and the other begins.
In a conventional AV receiver system, the crossover is part of digital bass management. It is not simply the same thing as turning a knob on the subwoofer.
Why the receiver says “Small” and “Large”
In an AV receiver menu, Small does not necessarily mean the speaker has a physically small cabinet. It tells the receiver to redirect bass below the selected crossover to the subwoofer.
Large, sometimes labelled Full Band, generally tells the receiver to send the complete channel signal to that speaker, including deep bass. A large floorstanding speaker can still be set to Small if it integrates more cleanly with the subwoofer or if it cannot reproduce deep bass at the required level without distortion.
When a powered subwoofer is present, Small is usually the more useful setting for speakers that are being bass-managed. It reduces deep-bass demands on their drivers and can leave more of the AV receiver’s amplifier capacity available for the rest of the soundtrack.
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How to set the crossover: a practical sequence
- Connect the subwoofer correctly. Use the receiver’s dedicated subwoofer or LFE output and the input specified by the subwoofer manufacturer.
- Run the receiver’s automatic room calibration. If your receiver includes an automatic setup system, use it as a baseline. Calibration can identify speaker distance, level, phase-related settings, and room-response problems.
- Set speakers with a subwoofer to Small. Do this unless a measured, system-specific result or the speaker manufacturer’s guidance supports Full Band.
- Set the initial crossover to 80 Hz. Use 80 Hz if the receiver offers it and the speakers are typical bookshelf, center, surround, or moderately capable floorstanding models.
- Disable the subwoofer’s competing low-pass filter. Set its control to LFE, maximum, or bypass when the receiver is managing the crossover.
- Check distance, level, and phase. A poor blend may be caused by timing, volume, phase, placement, or room modes rather than the crossover frequency itself.
- Listen and adjust one available step at a time. Try the receiver’s next higher or lower crossover setting and compare familiar material.
After setup, the subwoofer should not sound like a separate box in the room. Bass should appear to come naturally from the front soundstage, with no obvious hole or excessive boom around the transition.
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Choose the crossover from the speaker’s bass capability
Look at the speaker’s published frequency-response specification and owner’s manual. The lowest number in the specification is useful, but it is not automatically the correct crossover. Published response figures may use different tolerances, and a speaker’s clean output changes with listening level, room placement, enclosure design, and the demands of movie soundtracks.
| Speaker | Useful starting range | Why |
|---|---|---|
| Very small satellites | 120–150 Hz | They may not produce deep bass cleanly or loudly enough for a lower handoff. |
| On-wall or compact satellites | About 120–150 Hz | Their limited cabinet volume and driver size often call for a higher crossover. |
| Small-to-mid-size bookshelf, center, or surround speakers | 80–100 Hz | This commonly protects the speaker while keeping the transition low enough to remain unobtrusive. |
| Large bookshelf or monitor speakers | 60–80 Hz | They may have useful output lower in frequency, but room behavior still matters. |
| Towers with 4- to 6-inch woofers | About 60 Hz | They can usually handle more bass than compact speakers, but may still benefit from subwoofer support. |
| Towers with 8- to 10-inch woofers | About 40–60 Hz or Full Band | The design may support a lower handoff, although Full Band is not always the smoothest room response. |
For example, if a compact speaker is specified down to 80 Hz, try 90 or 100 Hz rather than assuming 80 Hz is ideal. If a floorstanding speaker is specified down to 35 or 40 Hz but sounds cleaner and more dynamic when relieved of deep bass, 60 or 80 Hz may still be the better choice.
Why start about 10 Hz above the speaker’s low end?
A speaker’s response normally rolls off gradually instead of stopping at a precise frequency. If the crossover is set exactly at the lowest point in the published specification, the speaker may already be losing output near the handoff. Starting somewhat higher gives the speaker and subwoofer overlapping operating ranges and reduces the risk of a weak transition.
The 10-Hz guideline is not a measurement substitute. Room gain, seating position, placement, listening volume, and the response tolerance used in the specification can all change the result. Use it to select the first receiver setting, then confirm the result with calibration and listening.
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AV receiver crossover versus the subwoofer’s low-pass knob
When an AV receiver is handling bass management, the receiver should normally be the only component setting the speaker crossover. Leave the subwoofer’s low-pass control at LFE, maximum, or bypass.
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If the receiver is set to 80 Hz but the subwoofer’s own control is set to 60 Hz, the two filters can interact. That may create an unintended dip or make the transition less predictable. This is one of the most common setup errors.
A simple stereo system without an AV receiver may be different. If the subwoofer is connected to a preamp, powered speaker, amplifier, or source component that does not provide bass management, the subwoofer’s low-pass control may be the only crossover control available. In that case, set it near the recommended speaker-to-subwoofer transition and adjust it for the smoothest blend.
Do not confuse the speaker crossover with “LPF of LFE”
Many receivers display both speaker crossover settings and a setting called LPF of LFE. They perform different jobs.
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- LPF of LFE: controls the low-pass treatment of the dedicated LFE or “.1” effects channel in multichannel soundtracks.
Changing the front-speaker crossover from 80 to 100 Hz does not automatically mean you should change LPF of LFE. Keep the LFE setting recommended by the receiver manual—many receivers use a 120-Hz value—and change it only when there is a specific technical reason to do so.
Setting center and surround speaker crossovers
Center and surround speakers are often less capable of clean deep-bass output than large front towers. A typical center or surround speaker may work well around 80–100 Hz, while a compact satellite may need 120–150 Hz.
If the receiver allows independent crossover settings, different channels can use different values. For example:
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Some receivers apply one global crossover to all speakers. If yours does, choose a compromise that protects the least capable bass-managed speakers rather than choosing a setting solely for the largest front pair. A crossover that is slightly high for the towers is generally preferable to sending excessive deep bass to small surrounds or a compact center.
What changes when there is no subwoofer?
If no subwoofer is connected, the system cannot redirect bass to that subwoofer. In a two-channel system without a subwoofer, the speakers must reproduce the full bass range themselves. In a home-theater receiver, configure the system for Subwoofer: No or its equivalent and verify where the receiver sends low-frequency content from the other channels.
Many receivers route bass from other channels toward the front speakers when no subwoofer is present. Do not leave the receiver configured as though a subwoofer exists while no subwoofer is connected; bass may be directed to a nonexistent output or handled in an unintended way.
How to fine-tune the setting by ear
Use familiar material rather than a single bass-heavy demo. Try music and film scenes containing sustained bass, kick drums, bass guitar, male and female dialogue, and effects that move across the front soundstage.
Listen for these symptoms:
| What you hear | What to check |
|---|---|
| A thin sound or a noticeable hole around the handoff | The crossover may be too low for the speaker. Raise it by one available receiver step and listen again. |
| Thick, chesty, or boomy voices | Check subwoofer level, placement, room modes, phase, and duplicate low-pass filtering before lowering the crossover. |
| The subwoofer’s location is obvious | Check the crossover, subwoofer placement, phase, and level. A crossover that is too high can make bass easier to localize. |
| Small speakers sound strained at higher volume | Raise their crossover so more demanding bass is redirected to the subwoofer. |
| Bass changes dramatically between seats | The room and subwoofer position may be the main problem. Try placement changes or room correction rather than repeatedly changing the crossover. |
Change only one setting at a time. If you change crossover, subwoofer level, phase, distance, and placement together, you will not know which adjustment helped.
Common crossover mistakes
- Using 80 Hz for every speaker automatically. It is an excellent starting point, but very small satellites may need 100–150 Hz, while capable speakers may work lower.
- Choosing Large because the cabinet is physically large. The receiver label describes bass management, not cabinet dimensions.
- Leaving the subwoofer low-pass knob at a low setting. Use LFE, maximum, or bypass when the receiver is controlling the crossover.
- Changing LPF of LFE as though it were the speaker crossover. The LFE channel and redirected speaker bass are separate functions.
- Setting the crossover too low to make the number look impressive. A small speaker may distort or lose output when asked to reproduce bass it cannot handle cleanly.
- Treating the published frequency-response floor as a recommended crossover. Start somewhat above that floor and verify the blend.
- Blaming every bass problem on crossover frequency. Placement, phase, level, room modes, wiring, calibration, and receiver configuration can produce similar symptoms.
When equipment or professional help may be worthwhile
If your receiver lacks useful bass-management controls, an appropriately configured AV receiver with adjustable speaker crossovers can make setup easier. Replace the receiver only when its limitations are genuinely affecting the system; a new unit cannot correct poor subwoofer placement or severe room modes by itself.
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For systems with multiple subwoofers, difficult room geometry, persistent seat-to-seat bass differences, or extensive room treatment, professional home-theater calibration may be worthwhile. A handheld sound-level meter is optional for ordinary setup and is not required to find a good crossover by ear.
Quick reference
For the safest general starting point, set the receiver to:
- Speakers: Small
- Crossover: 80 Hz
- Subwoofer low-pass control: LFE, maximum, or bypass
- LPF of LFE: Leave at the receiver manufacturer’s recommended value
Then move higher for small speakers and lower for genuinely capable speakers only when the resulting blend is cleaner. The correct crossover is the setting that protects the speakers and produces smooth, well-integrated bass throughout the listening area.
Frequently Asked Questions
What crossover frequency should I use?
For most home-theater systems with a powered subwoofer, 80 Hz is the best starting point. Small satellites may need 120–150 Hz, while larger capable speakers may work at 40–80 Hz.
Should my speakers be set to Small or Large?
Set the speakers to Small when you want the receiver to redirect bass below the selected crossover to the subwoofer. Small refers to bass management, not necessarily the speaker’s physical size.
What should the subwoofer low-pass filter be set to?
Set the subwoofer’s low-pass control to LFE, maximum, or bypass so the AV receiver is the only component applying the speaker crossover.
Is LPF of LFE the same as the speaker crossover?
No. The speaker crossover controls redirected bass from channels set to Small. LPF of LFE controls the dedicated .1 effects channel and should normally remain at the receiver manufacturer’s recommended value.
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If there is no subwoofer, configure the receiver for Subwoofer: No or its equivalent and verify that bass is routed to the front speakers. Do not use a subwoofer crossover setting for a nonexistent subwoofer.
The Bottom Line
Bottom line: Begin at 80 Hz with the speakers set to Small and the subwoofer set to LFE or maximum. Use roughly 10 Hz above each speaker’s lowest clean frequency as a guide, then fine-tune for a seamless transition without a bass gap, boom, or audible subwoofer location.
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