Quick Answer
- The best crossover settings for car audio start with 24 dB per octave Linkwitz-Riley filters: tweeter high-pass at about 3,500 Hz, door speaker high-pass at 80 Hz and subwoofer low-pass at 70 to 80 Hz (Audio Intensity, 2026).
- Set the high-pass on the upper speaker and the low-pass on the lower speaker to the same frequency and slope, so the two blend into a flat response.
- Keep the subwoofer low-pass at or below 80 Hz. Above that, listeners start to hear where the bass is coming from (Audio Intensity, 2026).
- Ported subwoofers need a subsonic filter near the box tuning frequency, while sealed subwoofers can run without one.
- These are starting values. Adjust by ear or with a measurement microphone for your speakers, their mounting spots and your taste.
The best crossover settings for car audio are a tweeter high-pass near 3,500 Hz, a door speaker high-pass at 80 Hz and a subwoofer low-pass between 70 and 80 Hz, all at 24 dB per octave. Those values protect small speakers, keep the bass up front and give each speaker the range it plays best. Your exact numbers depend on speaker size, so the tables below list starting values for each common driver.
Best Crossover Settings by Speaker Size
Speaker size decides most of your crossover settings, because a bigger cone can play lower notes and a smaller one can play higher notes. Audio Intensity, which tunes customer systems professionally, starts every build from the values below, all with 24 dB per octave Linkwitz-Riley (LR4) slopes (Audio Intensity, 2026).
| Speaker | High-pass (HPF) | Low-pass (LPF) |
|---|---|---|
| 1-inch dome tweeter | 3,500 Hz | None |
| 1-inch compression horn | 2,000 Hz | None |
| 3-inch midrange | 250 Hz | 5,000 Hz |
| 4-inch midrange | 200 Hz | 4,000 Hz |
| 6.5-inch door midbass | 80 Hz | 3,500 Hz in a 2-way |
| 8-inch door woofer | 60 Hz | 800 Hz |
| 10-inch sealed subwoofer | None | 80 Hz |
| 12-inch sealed subwoofer | None | 70 Hz |
| 12-inch ported subwoofer | Box tuning + 5 Hz | 80 Hz |
| 15-inch subwoofer | Ported: box tuning + 5 Hz | 60 to 70 Hz |
Two settings matter more than the rest. The tweeter high-pass protects the most fragile speaker in the car, and Audio Intensity recommends never running a dome tweeter below 3,000 Hz at any real volume. The subwoofer low-pass decides whether the bass sounds like it comes from the front or the trunk (Audio Intensity, 2026).
If you want to know why these filters behave the way they do, read our explainer on how a crossover works for car audio.
Best Settings for a 2-Way Front Stage With a Subwoofer
The most common car system is a pair of component speakers in the front doors plus one subwoofer. For this setup, the best starting point is a tweeter high-pass at 3,500 Hz, a door speaker band from 80 Hz to 3,500 Hz and a subwoofer low-pass at 80 Hz.
| Channel | High-pass | Low-pass |
|---|---|---|
| Tweeters | 3,500 Hz | None |
| Door speakers | 80 Hz | 3,500 Hz |
| Subwoofer | Subsonic if ported | 80 Hz |
All filters here use 24 dB per octave. The handoff between the door speaker and tweeter happens at 3,500 Hz on both sides, and the handoff between door speaker and subwoofer happens at 80 Hz on both sides (Audio Intensity, 2026).
If You Use the Passive Crossover From Your Component Set
If your component speakers run through their own passive crossover, that box already splits the tweeter and woofer. In that case, set only one filter on the front amplifier or head unit channels: a high-pass at 80 Hz. Leave the low-pass off on those channels.
Do not stack a second crossover on top of the first. A Crutchfield advisor sums it up: if your processor handles the active crossover duties, you do not need the passive crossover, and each speaker should have only one crossover (Crutchfield, 2023). Start the tweeter level switch at 0 dB and drop it to -3 dB if the highs sound sharp (Crutchfield, 2025).
Best Settings for a 3-Way Active System
A 3-way active system adds a small midrange speaker, usually a 3-inch or 4-inch driver in the dash or door, and gives every speaker its own amplifier channel. The best starting settings put the midbass between 80 Hz and 250 Hz, the midrange between 250 Hz and 3,500 Hz and the tweeter above 3,500 Hz.
| Speaker | High-pass | Low-pass |
|---|---|---|
| Tweeter | 3,500 Hz | None |
| 3-inch midrange | 250 Hz | 3,500 Hz |
| 6.5-inch midbass | 80 Hz | 250 Hz |
| Subwoofer | Subsonic if ported | 80 Hz |
Audio Intensity lists 5,000 Hz as the upper limit for a 3-inch midrange and uses 250 Hz as its handoff to the midbass (Audio Intensity, 2026). In the table, the midrange low-pass is set to 3,500 Hz to match the tweeter, because every handoff should use the same frequency on both sides. If your tweeter sounds harsh, move both the tweeter high-pass and the midrange low-pass up together, for example to 4,000 Hz.
Best Crossover Slope and Filter Type
The best default slope for car audio is 24 dB per octave with a Linkwitz-Riley filter (LR4). When the upper and lower speaker use the same LR4 filter at the same frequency, their output adds up to a flat response at the crossover point (Linkwitz, 1976).
Use a gentler slope, 12 dB per octave (LR2), only when two speakers sit close together and blend well, such as a midrange and tweeter in the same pod. LR2 filters put the two speakers 180 degrees out of phase at the crossover point, so reverse the polarity of one speaker when you use them (Linkwitz, 1976).
Use a steeper slope, 36 or 48 dB per octave, when a speaker has a resonance or breakup close to the crossover point. Audio Intensity gives the example of a tweeter with a 1.2 kHz resonance that needs a 48 dB per octave high-pass at 2,500 Hz (Audio Intensity, 2026). Whatever slope you choose, use the same one on both sides of each handoff.
Best Subwoofer Crossover and Subsonic Settings
The best subwoofer crossover setting is a low-pass between 70 and 80 Hz at 24 dB per octave, with the front speakers high-passed at the same frequency. Set it higher and the bass starts to sound like it comes from behind you; set it much lower and a gap opens between the subwoofer and the door speakers.
The subsonic filter depends on the box. A sealed subwoofer can run without one. A ported subwoofer needs one, because below the box tuning frequency the port stops controlling the cone and it can move too far (Audio Intensity, 2026). Audio Intensity sets the subsonic at the box tuning plus 5 Hz. A few hertz below the tuning keeps more deep bass and still protects most subwoofers, so choose based on how hard you play the system.
Leave the amplifier’s bass boost at zero while you set the crossover. For more ways to get low, clean bass without boost, see our guide on getting deep bass from a car subwoofer.
How to Fine-Tune These Settings in Your Car
Fine-tune by ear in three passes: front speakers alone, subwoofer alone, then everything together. Crutchfield suggests this order when adding a subwoofer (Crutchfield, 2025):
- Set the front high-pass and subwoofer low-pass to the starting values from the tables above.
- Turn the subwoofer off and play a familiar song. Raise the front high-pass until the door speakers stop distorting or rattling on bass notes.
- Turn the front speakers down and the subwoofer on. Lower the low-pass until vocals, guitars and cymbals disappear from the subwoofer.
- Play the whole system and make small changes to smooth any bump or dip around the crossover point.
Some quick fixes help at this stage. If the tweeters sound harsh at high volume, raise their high-pass by 500 Hz. If the doors buzz, raise the door speaker high-pass to 100 Hz. Always check the speaker manual for the lowest crossover point the manufacturer allows for the tweeter.
If you are still learning the controls on your head unit and amplifier, start with our guide to using a crossover in car audio.
Crossover Setting Mistakes That Hurt Sound
Most bad-sounding systems come from a few repeated crossover mistakes, and each one is easy to fix once you know it.
- Tweeter high-pass too low. Running a dome tweeter at 1,500 Hz can kill it within weeks, while the same tweeter lasts years at 3,500 Hz (Audio Intensity, 2026).
- Subwoofer low-pass too high. A low-pass of 100 or 120 Hz pulls the bass to the rear of the car. Drop it to 80 Hz or lower.
- Mismatched slopes. A 24 dB tweeter high-pass paired with a 12 dB door speaker low-pass smears the handoff. Match both sides.
- Two filters on one speaker. A head unit high-pass plus an amplifier high-pass on the same channel shifts the crossover point and steepens the slope. Turn one of them off.
- Using the crossover as a tone control. Crossover filters decide which speaker plays which notes. Shape the tone with an equalizer instead (Crutchfield, 2025).
Once the crossovers are set, move on to gain, time alignment and EQ. Our guide to the best DSP settings for car audio covers those next steps, and the Audio Intensity crossover settings guide has more detail on each driver size. If your amplifier has the only crossover in the system, our guide to tuning a car amplifier shows where each control sits.
Frequently Asked Questions About Crossover Settings
What is the best crossover frequency for car speakers?
For most cars, start with door speakers high-passed at 80 Hz and tweeters high-passed around 3,500 Hz, both at 24 dB per octave. Use the same frequency on the subwoofer low-pass as on the door speaker high-pass.
What is the best crossover setting for a subwoofer?
Start with a low-pass at 80 Hz for a 10-inch subwoofer and 70 Hz for a 12-inch sealed subwoofer, at 24 dB per octave (Audio Intensity, 2026). Add a subsonic filter near the box tuning if the box is ported.
Should I use a 12 dB or 24 dB crossover slope?
Use 24 dB per octave as the default, because it protects speakers better and sums flat with a Linkwitz-Riley filter. Try 12 dB per octave only between two speakers mounted close together, and flip the polarity of one of them.
What is the best crossover setting for 6.5-inch speakers?
Set a 6.5-inch door speaker’s high-pass at 80 Hz. In a 2-way active system, add a low-pass at about 3,500 Hz to hand off to the tweeter. Raise the high-pass to 100 Hz if the speaker is small, underpowered or the door rattles.
What should I set my tweeter crossover to?
Start at 3,500 Hz for a 1-inch dome tweeter and do not go below 3,000 Hz unless the manufacturer rates it for lower. Horn-loaded compression tweeters can usually start at 2,000 Hz (Audio Intensity, 2026).
Do crossover settings change for a sealed or ported box?
The low-pass stays about the same, but a ported box needs a subsonic filter near its tuning frequency to stop the subwoofer from over-moving on very deep notes. A sealed box controls the cone on its own and can run without one.
Summary: Best Crossover Settings for Car Audio
- Tweeters: high-pass at about 3,500 Hz, never below 3,000 Hz for most dome tweeters.
- Door speakers: high-pass at 80 Hz, with a low-pass at the tweeter handoff in a 2-way active system.
- Subwoofer: low-pass at 70 to 80 Hz, plus a subsonic filter for ported boxes.
- Use 24 dB per octave Linkwitz-Riley slopes and match frequency and slope at every handoff.
