Noisecatcher

External Microphones

Lightning and USB-C microphones for smartphone noise documentation — analysed for compatibility with Noisecatcher's ethos.

Why use an external microphone?

Smartphone microphones are designed for voice calls, not acoustic measurement. Their frequency response is shaped for speech intelligibility (typically boosted around 1–4 kHz, rolled off below 150 Hz and above 12 kHz), their preamps apply automatic gain control (AGC) that compresses dynamics, and their self-noise floors vary wildly between models. An external microphone bypasses the AGC, has a known and flatter frequency response, and can be positioned optimally — at body height, at the noise source, or in a fixed mount.

When a USB-C or Lightning microphone is connected, it appears as a separate audio input device. On the Meter screen, a device selector appears above the Start button — choose the external microphone. Noisecatcher uses the Web Audio API to route from the selected input; no additional driver or app is needed.

Choosing a pickup pattern

Omnidirectional

Best for noise monitoring. Captures sound from all directions equally. Worn as a lavalier at chest height, it measures personal exposure as the body experiences it.

Stereo (M-S or XY)

Best for spatial documentation. Captures direction as well as level — you can hear and document where a noise originates. Ideal for complex soundscapes, protests, industrial sites.

Binaural (in-ear)

Purest personal exposure record. Captures exactly what the wearer's ears hear, including HRTF. Irreplaceable for evidence of harassment, assault, or sustained exposure.

Ambisonic

Full-sphere spatial capture — records all directions simultaneously in a format that can be decoded to any perspective. Ideal for documenting the complete acoustic character of a location: industrial zones, construction sites, contested public space.

Cardioid (directional)

Useful for targeted source capture — point it at the machine, vehicle, or person. Rejects rear sound, so not suitable for ambient monitoring. Best used when you know exactly what you are documenting.

Lightning microphones (iPhone/iPad, pre-USB-C)

iPhone models up to iPhone 14 use Lightning. iPad Pro (2018+) uses USB-C. MFi certification ensures full compatibility.

Shure MV88~$149
Ideal
Connector LightningFormat Stereo (M-S)Pattern Cardioid + bidirectional capsules (Mid-Side stereo)Quality 24-bit / 48 kHz

MFi-certified. Adjustable capsule angle (0–90°). Companion MOTIV app for DSP. Gold standard for journalist and documentary field work on iPhone.

Ethos: M-S stereo captures the full spatial acoustic environment as experienced by the listener. Documenting not only the level but the spatial origin of a noise source is directly aligned with the counter-forensic ambition of Noisecatcher.
Rode VideoMic Me-L~$70
Acceptable
Connector LightningFormat MonoPattern Cardioid (directional)Quality 24-bit

Compact, bus-powered from iPhone/iPad Lightning port. Runs entirely from device. Good for speech, interviews, and targeted source capture.

Ethos: Cardioid pattern rejects rear-hemisphere sound. Useful for directional documentation (e.g. recording a specific machine or speaker) but not representative of ambient noise exposure as experienced by a body in space. Use omnidirectional for noise monitoring.
Apogee ClipMic Digital (Lightning)~$119
Ideal
Connector LightningFormat Mono lavalierPattern OmnidirectionalQuality 24-bit / 44.1 kHz

Clip to clothing at chest height. Apogee preamp electronics. Very low self-noise. USB-C version also available (same capsule, different connector).

Ethos: Omnidirectional lavalier worn at chest height measures noise as a human body experiences it — from all directions, at the listener's position. This is the most forensically honest capture mode for personal noise exposure documentation.
Apogee HypeMiC~$279
Good
Connector Lightning + USB-CFormat MonoPattern Cardioid, large-diaphragm condenserQuality 24-bit / 96 kHz

Built-in hardware compressor (3 presets). Works with Lightning, USB-C, and standard USB. Headphone output with zero-latency monitoring.

Ethos: High-quality cardioid. Avoid using the compressor during noise measurement — it modifies signal dynamics and will distort Leq readings. Disable compression in the companion app when using with Noisecatcher.
IK Multimedia iRig Mic HD 2~$100
Good
Connector Lightning + USB-CFormat MonoPattern Cardioid condenserQuality 24-bit / 96 kHz

Ships with both Lightning and USB-C cables. Compatible with iPhone, iPad, and Android. Multi-function gain knob. Headphone monitoring output.

Ethos: Reliable cardioid for close-source and speech capture. Same cardioid caveat as VideoMic Me-L applies for ambient monitoring — front-facing placement required.
Sennheiser AMBEO Smart Headset~$200 (verify availability)
Ideal
Connector LightningFormat Binaural (in-ear)Pattern Two omnidirectional capsules (one in each ear tip)Quality 24-bit / 48 kHz

Records true binaural audio: two microphones positioned at the ears, capturing the acoustic environment exactly as the listener hears it — including head-related transfer function (HRTF), pinna diffraction, and body occlusion. Originally released ~€200. Production status: verify current availability — may be discontinued or limited stock.

Ethos: For Noisecatcher, this is the philosophically purest capture device: it records acoustic reality as a body experiences it. The human body is the primary sensing device; this microphone treats the ear exactly as Noisecatcher's ethos demands. Binaural recordings provide irreplaceable evidence of personal exposure — courts and medical reviewers can listen to what the claimant heard.
Saramonic SmartMic (Lightning)~$35
Acceptable
Connector LightningFormat MonoPattern Cardioid (directional)Quality 16-bit

Budget entry point. No battery required. MFi certified. No companion app needed. Also available in 3.5mm TRRS version — make sure you order the Lightning variant.

Ethos: Adequate for speech and interview capture. Directional pattern and lower bit depth limit its usefulness for nuanced noise documentation. Best suited to direct-source recording rather than ambient monitoring.

USB-C microphones (Android + iPhone 15+)

iPhone 15 and later use USB-C. All modern Android flagships use USB-C. Note: Android OEMs sometimes implement audio differently — test before a critical session.

Rode VideoMic Me-C~$70
Acceptable
Connector USB-CFormat MonoPattern Cardioid (directional)Quality 24-bit

USB-C variant of the VideoMic Me line. Works with Android phones and iPhone 15+. Bus-powered. Same capsule and character as the Me-L.

Ethos: Same ethos note as VideoMic Me-L: cardioid pattern is useful for targeted source documentation but not for omni ambient monitoring. Turn toward the source.
Apogee ClipMic Digital (USB-C)~$119
Ideal
Connector USB-CFormat Mono lavalierPattern OmnidirectionalQuality 24-bit / 44.1 kHz

USB-C version of the ClipMic Digital. Identical capsule and preamp, USB-C connector for Android and iPhone 15+. Clip to clothing at chest or collar height.

Ethos: Same recommendation as the Lightning version. Omnidirectional at body level = the ideal noise exposure capture position.
Zoom Am7~$80
Ideal
Connector USB-CFormat Stereo (M-S)Pattern Mid-Side stereo (cardioid + figure-8)Quality 24-bit / 48 kHz

Designed specifically for Android smartphones. Bus-powered. M-S matrix mode and XY stereo mode. Adjustable stereo width. Compact. The Zoom Am line is one of the few USB-C mobile-first stereo microphone families.

Ethos: M-S stereo gives the same spatial capture advantage as the Shure MV88 — documenting not just level but directionality. Highly recommended for Android users doing investigative noise documentation.
IK Multimedia iRig Mic HD 2 (USB-C cable)~$100
Good
Connector USB-CFormat MonoPattern Cardioid condenserQuality 24-bit / 96 kHz

The iRig Mic HD 2 ships with both Lightning and USB-C cables — same body, two connectors. USB-C cable gives Android and iPhone 15+ compatibility.

Ethos: Same note as the Lightning version.

Ambisonic & spatial microphones

Connect via USB (with OTG adapter) or 3.5mm TRRS (adapter required). Full spatial acoustic capture.

Voyage Audio Spatial Mic USB~$399
Ideal
Connector USBFormat Ambisonic (9-capsule A-format → B-format)Pattern Full-sphere omnidirectional array (9 MEMS capsules)Quality 24-bit / 48 kHz

Nine MEMS microphone capsules arranged in a sphere. Records in A-format, decoded to first-order B-format (W, X, Y, Z) ambisonics. USB-A bus-powered; use a USB-C OTG adapter for smartphone connectivity. Companion decoder app for binaural or stereo monitoring. Designed for immersive audio, VR, and spatial documentation. voyage.audio

Ethos: Ambisonic capture is the fullest possible acoustic record of a place: every direction, every reflection, the complete acoustic sphere. For Noisecatcher, this means documenting not only the decibel level but the spatial topology of a noise environment — which direction the source comes from, how it reflects, how it fills a space. Uniquely powerful for industrial sites, protests, or any contested acoustic territory.
SP15V Binaural Video Microphoneverify with retailer
Ideal
Connector 3.5mm TRRSFormat Binaural (360° spatial / in-ear array)Pattern Binaural omnidirectional capsules — records 360° spatial audio

Designed for mounting on DSLR and mirrorless cameras. Records 360° spatial audio via binaural capsule placement. Connects via 3.5mm TRRS to camera or smartphone (use a Lightning/USB-C to 3.5mm adapter). Suited to documentary and video journalism work.

Ethos: Binaural 360° capture at the recording position gives a complete and embodied sonic record. For harassment, assault, or environmental noise evidence, this format preserves the spatial context — the listener of the recording can hear exactly what the recordist heard and from which direction. Via adapter, usable with smartphones.
Roland CS-10EM~$60–80
Ideal
Connector 3.5mm TRRSFormat Binaural (in-ear)Pattern Two omnidirectional microphone capsules, one per earQuality Analog — dependent on recording device ADC

Earphone-microphone combination: worn in the ears, capsules sit at the entrance to the ear canal and record true binaural audio including HRTF, pinna diffraction, and head shadowing. Connects via 3.5mm TRRS to Roland recorders, cameras, or smartphones (Lightning/USB-C adapter required). Earphones also serve as monitoring output while recording.

Ethos: The most discreet binaural option: indistinguishable from ordinary earphones. For documenting harassment, assault, or daily noise exposure, the Roland CS-10EM can be worn continuously without drawing attention — capturing exactly what the ears hear at the moment of the event. This is the body-as-sensor principle made wearable.

What is not in this guide

  • XLR ambisonic microphones (Sennheiser AMBEO VR Mic, Røde NT-SF1, Zoom H3-VR) — these require an audio interface or dedicated recorder and are not directly usable with a smartphone. The Voyage Audio Spatial Mic USB is listed above as the mobile-compatible exception.
  • Wireless lavalier systems (Rode Wireless GO, DJI Mic, Hollyland Lark) — these are transmitted as analog or compressed digital and reconstructed. The signal chain adds processing that may distort Leq readings. Not recommended for noise measurement unless using the USB-C receiver output and disabling compression.
  • 3.5mm TRRS microphones — excluded from this guide as iPhone 7+ removed the headphone jack. A Lightning or USB-C to 3.5mm adapter introduces an additional ADC stage; audio quality is adapter-dependent and generally inferior to native digital connections.
  • Noise-canceling headsets with pass-through — explicitly excluded by Noisecatcher's ethos. See the About page.

Recommendation for Noisecatcher

For noise monitoring and personal exposure documentation: omnidirectional lavalier at chest height (Apogee ClipMic Digital).

For spatial documentation of a noise environment: M-S stereo (Shure MV88 on iPhone, Zoom Am7 on Android).

For harassment, assault, and personal sonic testimony: binaural in-ear (Sennheiser AMBEO Smart Headset — verify availability; or Roland CS-10EM with 3.5mm adapter). The recording captures exactly what the person heard. The CS-10EM is discreet, wearable, and significantly more accessible.

For complete acoustic documentation of a contested location: ambisonic (Voyage Audio Spatial Mic USB via OTG adapter). Every direction, every reflection — a full acoustic map that can be decoded and replayed from any listening perspective.

Prices and availability correct to the best of knowledge as of 2024–2025. Verify with retailers before purchasing. The microphone market evolves rapidly.

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