Commercial Surveillance Microphones

Plan Your Deployment

Legal and compliance considerations for audio recording
Indoor vs outdoor environmental requirements
Camera compatibility and input type
Coverage area and sensitivity planning
Power and cabling requirements

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Axis

SKU: 01798-001

Axis TP3901 Microphone Kit Accessory - 01798-001

Integrated microphone kit for AXIS P32-LV cameras with synchronized audio
- Microphone with protective white casing matches Axis camera aesthetics
- Powers directly from camera connection—no separate audio supply needed
- Pairs video and audio recording for incident documentation and liability
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Axis

SKU: 01560-001

Axis T8351 Mk II Omnidirectional Microphone - 01560-001

Omnidirectional 3.5mm microphone with dust and water resistance
- Omnidirectional pickup captures sound from all directions simultaneously
- 3.5mm jack connects directly to Axis network cameras and encoders
- Dust and water-resistant sealed casing for outdoor and wet environments
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Axis

SKU: 02547-001

Axis TP3906 Camera Microphone Kit - 02547-001

Audio input microphone kit for AXIS P32 series network cameras
- Microphone with connection cables captures clear indoor surveillance sound
- Compatible with AXIS P32 series cameras for direct integration
- Installation guide and all components included for quick setup
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Axis

SKU: 01561-001

Axis 01561-001 Digital Microphone

Omnidirectional digital mic with 100m range for Axis devices
- Omnidirectional pickup captures audio equally from all directions
- 100-meter transmission range reaches distant monitoring zones
- Ring power from compatible Axis devices eliminates separate supply
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Axis

SKU: 5505-041

Axis T8353 Microphone Wall Mount Bracket - 5505-041

Clear plastic wall mount bracket for AXIS T8353A microphone
- Compatible with AXIS T8353A microphone for dedicated audio capture
- Mounts on walls, ceilings, and hard surfaces with adjustable positioning
- Clear plastic design stays discreet while quick installation saves setup time
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Axis

SKU: 5032-531

Axis T8353A 3.5mm Omnidirectional Microphone - 5032-531

Omnidirectional 3.5mm microphone for Axis cameras and encoders
- 360° omnidirectional pickup captures audio from all directions simultaneously
- Simple 3.5mm jack connection to any compatible Axis network product
- Natural, neutral audio reproduction for accurate incident documentation
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Axis

SKU: 02269-001

Axis TU1001-VE Compact Outdoor Microphone - 02269-001

IP66 compact outdoor mic with 71.4 dB SNR for networked systems
- Hemispherical pickup captures balanced ambient audio across 20 Hz–20 kHz
- IP66-rated aluminum casing handles –20 °C to 60 °C outdoor conditions
- Ultra-low 0.006 W power draw with 3.5 mm stereo plug connectivity
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Axis

SKU: 02082-001

Axis TU1002-VE Professional Microphone Kit - 02082-001

Professional microphone kit for Axis network audio systems
- 74 dB signal-to-noise ratio with 112 dB max SPL for clear audio
- IP66/IK10 rated housing withstands indoor and outdoor conditions
- 20 Hz–20 kHz frequency response captures full audio spectrum
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i-PRO

SKU: WV-PM500

i-PRO WV-PM500 Compact Microphone Unit

IP65 compact microphone unit for 24/7 audio with i-PRO cameras
- IP65 dust and water resistance for outdoor and washdown environments
- Continuous day/night audio capture independent of lighting conditions
- ONVIF compatible integration into existing multi-vendor VMS platforms
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Speco Technologies

SKU: MCA10

Speco Technologies MCA10 10-Foot Microphone Cable

10-foot microphone cable for control rooms and surveillance audio
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What to Look For When Buying

The decisions that matter most before you spec.

Audio Synchronization with Video Recording

Misaligned or out-of-sync audio undermines investigative value. Confirm your NVR or encoder supports frame-locked or timestamp-corrected audio-video pairs, especially across multi-location deployments where standards enforcement becomes critical.

Microphone Sensitivity & Ambient Noise Control

Sensitivity measured in dBV/Pa determines capture distance and ability to record quiet speech or machinery. In noisy environments (manufacturing, traffic), directional or noise-gated microphones prevent audio clipping and improve usability. Incidents require clear evidence—poor audio quality renders footage legally or operationally useless.

Power & Cabling: PoE Audio vs. DC-Powered Modules

Some microphones draw PoE power directly from camera or encoder; others require dedicated 12VDC or 24VAC. Factor power budgets into PoE planning and ensure cable runs do not exceed device current limits, particularly in large multi-building installations.

Environmental & Weatherproofing Standards

Indoor microphones may not survive humidity, rain, or temperature swings. Verify IP67 or IP68 rating if mounting outdoors or in dock areas. Stainless-steel or marine-grade enclosures add cost but eliminate premature failure and system downtime during critical events.

Codec & Bitrate Impact on Storage & Bandwidth

Audio codecs (G.711, G.726, AAC) trade quality against file size. PCM-uncompressed audio uses 64 kbps per channel; lossy codecs reduce this 4–10×. Calculate real retention impact when combined with motion-triggered or continuous video to avoid undersizing storage or hitting network limits.

Compliance, Privacy & Legal Jurisdiction

Recording audio in shared spaces (lobbies, meeting rooms) triggers strict consent and privacy laws in many jurisdictions. Confirm audio-only recording is permitted by counsel, and implement clear notification signage. Multi-tenant and healthcare deployments especially require documented approval before purchasing and deploying microphones.

Technology Stack

The specs and acronyms that actually affect microphones performance.

Sensitivity (dBV/Pa)

Measures microphone output level for 1 Pa (94 dB SPL) of sound pressure. Higher sensitivity (less negative values, e.g., −35 dBV/Pa) captures quieter speech and distant events; lower sensitivity (−50 dBV/Pa) suits loud industrial environments. Critical for speech intelligibility in investigative review.

Frequency Response (Hz)

Bandwidth the microphone reliably captures, typically 20 Hz–20 kHz for surveillance. Narrower ranges (300 Hz–3.4 kHz) suit speech-only applications and reduce wind/traffic noise; wider ranges capture machinery and ambient context. Mismatch causes loss of key investigative evidence.

Directional Pattern (Omnidirectional vs. Cardioid vs. Shotgun)

Omnidirectional captures sound equally from all directions; cardioid rejects rear and side noise; shotgun (super-cardioid) isolates single sources at distance. Pattern choice determines whether you record room ambience or target one voice—major impact on audio usability and storage burden.

Audio Codec & Bitrate

Compression method (G.711 at 64 kbps, G.726 at 16–32 kbps, AAC at 24–128 kbps) determines file size and quality. Lower bitrates reduce bandwidth and storage but risk losing speech intelligibility. PCM uncompressed preserves all detail but consumes ~64 kbps per mono channel or higher for stereo.

Impedance & Interface (Line-Level vs. Mic-Level)

Microphones output either microphone-level (millivolts, requires pre-amp) or line-level (volts, ready for encoder). 48V phantom power supplies active condenser capsules. Mismatched impedance or missing phantom power causes low/distorted audio. Verify your encoder or audio module supports the microphone's native output level.

IP Rating & Environmental Class

IP67/IP68 protects against dust and immersion; IP54 suits protected indoor environments. Temperature range (typically −10°C to +50°C) and humidity (0–95% non-condensing) define where microphones survive. Outdoor or HVAC-intensive spaces demand higher ratings to avoid seasonal failure.

Typical Deployment Scenarios

Corporate Office Multi-Room Audio (5 Conference Rooms + Lobby)

Deploy compact Axis or i-PRO plug-and-play microphones in each room, feeding PoE encoders wall-mounted near switches. Each microphone captures 1–3 hours of audio per day during business hours (motion-triggered). Storage: ~50 GB/month at G.726 codec. Compliance-critical: document consent signage and restrict playback to authorized staff.

Retail/Loss-Prevention Audio in Checkout & Storage Areas (3 Zones)

Install directional cardioid microphones aimed at register tapes and inventory doors. Pair with Speco Technologies compact audio modules on dedicated 12VDC power runs (avoid PoE load conflicts). Continuous recording at lower bitrate (16 kbps G.726) for 30-day retention. Audio triggers manual video review during shrink investigations.

Manufacturing Floor Machinery Monitoring (Noisy Assembly Line)

Use low-sensitivity omnidirectional microphones with noise-isolation enclosures at machine stations to log startup/shutdown and alarms. Frequency-response tuned to 500 Hz–4 kHz captures machinery audio without overwhelming human speech. Pair with audio-trigger rules to flag anomalies (unexpected noise spikes) and correlate with incident video.

Secure Interview Room (Legal/HR Compliance)

Install single cardioid or shotgun microphone, wired to isolated audio encoder with encrypted stream to secure NVR. Strictly 48V phantom-powered condenser capsule in weatherproof stainless enclosure. All recording logged with timestamped consent acknowledgment. Audio bitrate: PCM or lossless codec for legal admissibility. Separate USB export path for counsel review.

Frequently Asked Questions

Do I need a separate audio encoder, or does the camera/NVR handle microphone input?

Most IP cameras and NVRs have a single integrated audio input (microphone or line-level). If your camera includes a built-in microphone or accepts external input, you may not need a separate encoder. However, if you require multiple microphones, remote audio over long cable runs, or audio-only monitoring, a dedicated audio encoder (from Axis, i-PRO, or Speco) gives you flexibility, redundancy, and easier troubleshooting. Check your NVR's audio input specification before purchasing.

What is phantom power, and do all surveillance microphones need it?

Phantom power (typically 48V DC) is supplied through the same cable as the audio signal to power active condenser microphones. Not all microphones require it—dynamic and some lavalier types are passive or battery-powered. Confirm your encoder or pre-amp supplies 48V phantom power if you select a condenser capsule. Applying phantom power to a passive microphone usually causes no harm, but omitting it for a condenser results in no audio output.

How much storage do microphones add to my system, and what codec should I choose?

Mono audio at G.711 codec uses ~64 kbps; G.726 uses 16–32 kbps; AAC uses 24–128 kbps. For a single microphone recording 8 hours/day continuously, expect ~1.7 GB/month at G.726 or ~4.3 GB/month at G.711. Compare this to video bitrate using our retention math guide. For compliance and speech clarity, G.711 is recommended; for bandwidth-constrained sites, G.726 is acceptable.

Can I use consumer or home-theater microphones in a commercial surveillance system?

Consumer microphones are not recommended. They lack environmental hardening (IP rating, temperature range), correct impedance matching for AES/EBU audio standards, and the sensitivity tuning for speech intelligibility over distance. Surveillance-grade microphones undergo rigorous thermal and moisture testing and integrate seamlessly with encoder PoE/DC power schemes. The cost difference is modest (~$30–150 per unit) and prevents field failures.

What is cardioid vs. omnidirectional, and which should I choose?

Omnidirectional microphones pick up sound equally from all directions (useful for capturing room ambience or multiple speakers). Cardioid microphones reject sound from the rear, isolating the target source (ideal for interviews, boardrooms, or noisy environments). Shotgun (super-cardioid) is even more directional, capturing only a narrow cone of sound (useful for outdoor or long-distance speech capture). For most indoor commercial applications, cardioid is a safe default; choose omnidirectional only if you need full-room context.

How do I prevent wind noise and vibration from ruining outdoor microphone audio?

Use a foam windscreen (foam ball) over the microphone capsule for wind protection outdoors. For vibration (HVAC, machinery), mount the microphone on a shock-isolation bracket or elastomer isolator instead of rigid metal. Directional cardioid or shotgun patterns naturally reject side and rear noise. If mounting near glass, use a perimeter rubber gasket to isolate vibration transmission. Test audio quality in situ before finalizing the installation.

Microphones

Plan Your Deployment

Showing Results for Microphones

Axis TP3901 Microphone Kit Accessory - 01798-001

Axis T8351 Mk II Omnidirectional Microphone - 01560-001

Axis TP3906 Camera Microphone Kit - 02547-001

Axis 01561-001 Digital Microphone

Axis T8353 Microphone Wall Mount Bracket - 5505-041

Axis T8353A 3.5mm Omnidirectional Microphone - 5032-531

Axis TU1001-VE Compact Outdoor Microphone - 02269-001

Axis TU1002-VE Professional Microphone Kit - 02082-001

i-PRO WV-PM500 Compact Microphone Unit

Speco Technologies MCA10 10-Foot Microphone Cable

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