Room Measurement & Speaker EQ

A treated, measured listening room is the single biggest mix-quality investment a home producer can make. Free tools (REW alone) handle 95 % of needs; paid services like Sonarworks add convenience and per-headphone EQ profiles. For audio-analysis plugins inside a DAW (loudness / spectrum / dynamic range) see audio-effects-free. For DAWs see daws-overview.

Measurement software

• ★ Room EQ Wizard (REW) — freeware (closed source) by John Mulcahy, cross-platform Java. The de-facto standard free room measurement tool. Sweeps, RTA, waterfall, T60, group delay, Schroeder, Toole-style guidance. Exports filter presets for miniDSP, Equalizer APO, JRiver, and others.
• HOLMImpulse — free Win impulse-response measurement.
• CARMA (JBL) — free Win room analysis.
• ARTA — free Win acoustic measurement (registration; free for non-commercial).
• Smaart (Rational Acoustics) — paid (~$1k); the live-sound / install standard.
• Klippel R&D / dbx DriveRack — paid; speaker design / live install gear.

Per-headphone / monitor correction

• ★ Sonarworks SoundID Reference — paid (~$300, sub or perpetual). Measures your monitors with the included mic + applies correction across DAWs / system audio. Per-headphone profiles for hundreds of common headphones included. The default monitor-correction app for working pros.
• MathAudio Room EQ (free + paid VST) — free standalone, paid VST.
• dSONIQ Realphones — paid; headphone correction-only.
• Genelec GLM — free with Genelec SAM monitors.
• IK Multimedia ARC System 4 — paid; bundled mic.

System-wide / DSP routing

• ★ Equalizer APO — GPL Win system-wide parametric EQ; the way to apply REW filters globally on Win.
• ★ EasyEffects — see audio-routing-linux-pipewire; Linux system-wide effects rack.
• Audio Hijack / SoundSource — Mac per-app effects; see audio-routing-win-mac.
• JRiver Media Center — paid; built-in convolution / EQ.
• Roon — paid; convolution + parametric EQ baked in.
• HQPlayer — paid Win / Linux audiophile DSP.

Convolution / impulse-response loaders

• MConvolutionEZ (Melda) — free convolution loader; load REW-exported impulse responses.
• Voxengo Pristine Space — paid convolution.
• Liquid Sonics Reverberate — paid premium convolution.
• rt-IR / x42 zita-convolver — Linux LV2.

Microphones for measurement

• miniDSP UMIK-1 / UMIK-2 — affordable USB measurement mics with calibration files; pair with REW.
• Dayton Audio EMM-6 — XLR measurement mic.
• Earthworks M30 / M50 — pro reference mics.

Acoustic treatment / DIY

• GIK Acoustics — paid; custom panels.
• Auralex / Primacoustic — paid; off-the-shelf.
• DIY rockwool / Owens Corning 703 — community-favored DIY.
• Floyd Toole, "Sound Reproduction" — the room-acoustics reference book.

Pick this if…

• Free room measurement: REW.
• System-wide correction on Win: Equalizer APO + REW exported filters.
• System-wide correction on Linux: EasyEffects + REW.
• Working pro, monitor + headphone correction: Sonarworks SoundID Reference.
• Live sound install: Smaart.
• Genelec SAM monitor user: GLM (free).