Marsh Studio
v1.0.0 — out nowFor macOS 14.4+

Studio-grade EQ for every sound your Mac makes.

A system-wide 10-band equalizer for Mac with your headphone brand's signature sound modes built in. No drivers. No lag. No subscription.

One-time purchase · 3 Macs · No account

MarshEQ window showing the Apple Balanced Tone sound mode on a 10-band EQ, with brand tabs for Apple, Marshall, JBL, Sony, Bose and Sennheiser, transport controls, and a volume slider

Try before you buy

Nothing to lose. Literally.

The whole app is free for a week, and your money is refundable for two more. Trust your ears, not our copy.

7 daysfull free trial — no card, no account
14-daymoney-back guarantee, no questions asked
3 Macscovered by one lifetime license
1.5 MBnative app — no drivers, no bloat

Brand Sound Modes

Your headphones' sound modes, on your Mac.

Pick your headphone brand and get its signature sound modes as one-click chips — 26 modes across 6 brands, authored to match each companion app's tuning.

Apple

Balanced ToneVocal RangeBrightness

The Headphone Accommodations tunings, on every output.

Bose

Bass BoostBass ReducerTreble BoostTreble Reducer

The Bose app presets, without the Bose app.

JBL

JBL SignatureBassJazzVocal

The JBL Headphones app presets on your Mac.

Marshall

Marshall SignaturePushVoice

Warm Signature, V-shaped Push, mid-forward Voice.

Sennheiser

NeutralClubMoviePodcast

Smart Control modes, including true-flat Neutral.

Sony

BrightExcitedMellowRelaxedVocalSpeechTreble BoostBass Boost

All eight Sound Connect presets, one click each.

Connect a known headphone and its brand is suggested automatically. Brand and mode names are factual references to each companion app's features — no affiliation or endorsement implied. Every curve is our own 10-band tuning.

Features

Small app. Serious signal path.

Everything a system-wide EQ should do, and nothing it shouldn't.

No drivers. No kexts.
Built on native macOS process taps. Nothing to install at the system level, nothing to uninstall later.
Per-device memory
Every output device remembers its own preset — and known headphones get their brand's modes suggested on connect.
A/B compare
Hold to bypass and hear the untouched signal. Release to snap back. Trust your ears, not the hype.
Global hotkeys
⌥⌘E toggles the EQ, ⌥⌘↑/⌥⌘↓ cycle presets — from any app, no focus needed.
Auto-headroom
Headroom is reserved automatically for your biggest boost, so the output never clips. Ever.
Dot-matrix visualizer
A warm LED spectrum glows behind the sliders and shrinks to a live micro meter in your menu bar — with transport controls and a hardware volume slider built in.

Under the hood

Built the way Apple intended.

For the technical crowd: here's exactly what happens to your audio.

01

Native process taps

MarshEQ taps system audio through the modern Core Audio API introduced in macOS 14.4. No virtual audio driver, no kernel extensions — quit the app and your Mac is exactly as it was.

02

Apple's own DSP

EQ is applied with AUGraphicEQ, the same Audio Unit Apple ships for pro audio. Battle-tested filters, vanishingly low latency, negligible CPU.

03

Zero resampling

Audio stays at its native sample rate end to end. Set everything flat and the signal passes through bit-clean — nothing added, nothing lost.

System audio → process tap → preamp + AUGraphicEQ → your output device

Pricing

Pay once. Own it.

No subscription, no account, no upsells.

Lifetime license
$14.99one-time

Try everything free for 7 days first — no card, no account.

  • Instant license key by email — activates today
  • Use on 3 Macs
  • Free 1.x updates
  • 7-day full trial — no card required
  • 14-day refund policy
Buy MarshEQ — $14.99or start the free trial

Sold by Dodo Payments (merchant of record). 14-day money-back guarantee.

FAQ

Frequently asked questions

Answers to the questions everyone asks before buying.

Hear your Mac the way it was meant to sound.

Try every feature free for 7 days — no account, no card, nothing to undo.

Download for MacBuy — $14.99

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