The Low-End Problem Is a Missing Decision, Not a Frequency
Your kick and your bass are both trying to be the loudest thing between 40 and 120 Hz, and only one of them can win at any given moment. When the mix turns to mud down there, the cause is almost never a missing EQ move. The cause is that nobody decided which element owns which band and which slice of time.
Plugins don’t make that decision for you. A multiband compressor on the low bus will average the conflict into something quieter, not something clearer. What follows is an ownership plan: who holds which frequencies, who holds which milliseconds, and how to verify both without a spectrum analyzer telling you what you want to hear.
Pick the Kick First, Then Write the Bass
The kick is the fixed point. Its fundamental — usually somewhere between 45 and 60 Hz in trance and most four-on-the-floor EDM — and its decay length define the space the bass is allowed to occupy. Choose it before you write a single bass note.
A kick with a 400 ms tail that rings down through 60 Hz is a different instrument from a tight 120 ms punch. The long one already fills most of the bar at 138 BPM, where a quarter note is 435 ms. Put a 16th-note rolling bass under it and the two are fighting on every single step, with no gap to duck into. The long kick wants an offbeat bass that plays in the holes. The short kick tolerates rolling patterns because there is actual silence between hits.
If you postpone the kick choice until the mix, you’ve already written a bass part for a kick that doesn’t exist. Swapping the sample at that point changes the fundamental, the decay, and the phase relationship simultaneously — and you end up re-EQing everything to rescue an arrangement decision. Commit early.
Frequency Ownership: Who Holds What
A division that works for most trance and EDM material:
- 40–70 Hz: the kick. This is where the weight lives. Nothing else gets to be loud here.
- 70–200 Hz: the bass. This is body — the part people feel on a club system and hear on a laptop.
- 200 Hz and up: the bass’s character. Growl, harmonics, the part that survives on a phone speaker.
Two moves implement this. High-pass the bass so its energy starts climbing where the kick’s stops — typically in the 40–60 Hz region, set by ear against the specific kick, not by a rule. Then cut a narrow dip in the kick at the bass fundamental, or a narrow dip in the bass at the kick fundamental, depending on which element you want to lead.
Keep both moves small. If you need more than 2–3 dB to make the two elements coexist, the problem is the sample choice or the arrangement, not the EQ. A 9 dB notch is a confession that you picked the wrong kick.
Verify by ear, in this order: solo neither. Listen to kick and bass together, bypass the EQ, re-engage it. If you can’t hear the difference in context, the move isn’t doing anything useful — and a move you can’t hear is a move you can’t defend.
Keeping Everything Below 120 Hz Mono
Stereo-widened sub sounds enormous on headphones and disappears the moment the signal is summed to mono. Club PA systems sum the lows. So do most phone speakers, many bar systems, and every bluetooth speaker with a single driver. Out-of-phase sub content doesn’t get quieter in mono — it cancels.
Rule: all stereo information in the bass stays above roughly 150 Hz. The sub layer is a single channel, dead center, no chorus, no unison detune, no stereo reverb. If you’re layering — sub sine plus a mid-range growl — the split is natural: mono sine, stereo growl, crossover around 150 Hz.
Sidechain Is a Space Tool, Not an Effect
The pump is a side effect, not the goal. The goal is that during the 30–80 ms when the kick’s transient and initial body are sounding, the bass steps out of the way, and then comes straight back.
Use a volume envelope — an LFO tool or volume shaper synced to the grid — rather than a compressor when you can. A drawn envelope gives you exact control over depth and shape, and it behaves identically whether the bass is playing a sustained note or a 16th-note roll. A compressor’s behavior changes with input level, which means your ducking depth drifts as the arrangement gets busier.
If you do use a compressor: attack as fast as the plugin allows, so the gain reduction lands on the kick transient rather than after it. Release set so the bass is fully back before the next kick — that’s a tempo calculation, not a taste decision. Ratio around 4:1 to 8:1, threshold set so you see 4–8 dB of reduction on each hit. Watch the gain reduction meter return to zero before the next beat. If it doesn’t, the release is too long.
Tying the Release to the Tempo
At 138 BPM, a beat is 435 ms and a 16th note is 108 ms. That 108 ms is your working budget: the duck has to open, hold, and fully recover inside it if you’re running a 16th-note bass.
An envelope that recovers late steals RMS from the bass on every single beat. The track doesn’t sound pumped — it sounds thin, and you compensate by pushing the bass fader, which puts you right back into the kick’s territory. Set the recovery point visually against the grid, then confirm by muting the kick and checking that the bass still sounds like a continuous part rather than a stuttering one.
When you change tempo, the envelope is wrong. A 40 ms release that works at 138 BPM is a different fraction of the beat at 128 BPM. Anything synced to note values survives the change; anything set in milliseconds does not.
Phase and Timing: The Sneakiest Clash
If the kick and a sustained bass note start on the same grid position, their fundamentals can partially cancel. You hear it as the low end getting smaller when both play — which is the opposite of what the meters suggest.
Three controls, all of which come before EQ:
- Polarity flip. Put a polarity invert on the bass channel and A/B it. One position will have more weight at 60 Hz. Pick that one. This takes ten seconds and sometimes solves the whole problem.
- Trim the kick sample’s leading silence. Many samples carry a few milliseconds of nothing before the transient. That offset shifts the kick relative to everything quantized to the grid.
- Nudge the sub layer by a few milliseconds. Small delays change the phase relationship at low frequencies specifically. Move in 1–5 ms steps and listen for the position where the combined low end is loudest.
Do all three before touching an equalizer. EQ cannot fix cancellation; it can only make the cancelled region quieter or louder.
Offbeat Bass and Rolling Bass Are Different Problems
Classic trance offbeat bass — bass on the eighth-note upbeats, kick on the downbeats — is already separated in time. The kick and bass never start together. The problem here is tails: the kick’s decay bleeding into the bass note, and the bass’s release bleeding into the next kick. Shorten the bass amp release, tighten the kick decay, and use light or no sidechain. Heavy ducking on an offbeat pattern just makes the bass quieter for no reason.
Rolling or 16th-note bass collides on every kick hit. Here sidechain depth and shape are the primary tools, and the bass’s sub content is the variable that decides how deep you need to go. A bass with a strong sub component needs more ducking; a bass that’s mostly mid-range growl over a separate sine layer lets you duck only the sine, keeping the mid-range energy continuous.
Applying the offbeat recipe to a rolling bass produces mud. Applying the rolling recipe to offbeat produces a hollow, over-pumped mix. Diagnose which pattern you have first.
The Level Relationship: Kick Peaks, Bass Body
The kick is a transient instrument — it’s measured by peak. The bass is a sustained instrument — it’s measured by average energy. Comparing them on the same peak meter tells you nothing, because a bass that peaks 3 dB below the kick can easily carry twice the average energy.
Practical approach: route kick and bass to a shared bus, mute everything else, and balance them against each other in isolation. Set that bus so its combined output sits at a level you can live with on the master. Everything else in the track then gets balanced against this pair, not the other way around.
This has a direct consequence downstream. The kick+bass bus is what drives your limiter hardest. If the relationship is set before you add synths and vocals, you know how much headroom you have and you know what the limiter will grab. If you balance the low end last, every fader move upstream changes what the limiter is doing, and you chase the mix in circles.
Good on Headphones, Muddy on Speakers: The Check List
Four checks. The mix isn’t done until all four pass.
Mono. Sum to mono and listen for the bass getting smaller or vanishing. This catches phase cancellation and illegal stereo width below 120 Hz — the single most common reason a bass that sounded huge at home disappears on a club system.
Low-pass at 300 Hz. Put a temporary low-pass on the master and listen to only the low region. Stripped of the mid-range, you can hear whether the kick and bass are taking turns or stepping on each other. Muddy relationships are obvious here and invisible in the full mix.
Level-matched A/B with a reference. Load a commercial track in the same genre, match its loudness to yours by ear, and switch between them. Unmatched levels make the louder track win every time, so the matching is the whole point. Listen specifically for how much of the low end belongs to the kick versus the bass — that balance differs by subgenre, and it’s the fastest way to hear whether your kick is too small or your bass too wide.
Phone speaker. A phone reproduces almost nothing below 200 Hz. If the kick disappears entirely, it has no upper harmonic content and will vanish on every small system. The fix is adding click and body in the 1–4 kHz range, not more sub.
Each check catches a different failure. Mono catches phase. The low-pass catches overlap. The reference catches proportion. The phone catches translation. Skipping one means shipping with that specific problem intact.
What to Do Next
Open your current project. Solo the kick and bass bus, mute everything else, and run the four checks in the order above — mono, low-pass, reference, phone. Fix what fails before you touch anything else in the mix.
Then save the result as a template: the kick channel with its dip, the bass channel with its high-pass and mono-below-120 utility, the sidechain envelope synced to note values, and the shared bus routing. The relationship between kick and bass is structural, not creative. Rebuilding it from scratch on every track is time spent solving a problem you already solved.