4.2 Microphone Types, Pickup Patterns, Cost, Cables, and Connectors
Key Takeaways
- Form factor, transducer type, and pickup pattern describe different microphone characteristics and should not be confused.
- Omnidirectional and directional patterns each have useful applications; placement and room conditions matter more than labels alone.
- Higher price does not guarantee suitability, intelligibility, compatibility, or reliable courtroom performance.
- Balanced cables, secure connectors, correct input level, and required phantom power are part of the microphone system.
Three ways to describe a microphone
A microphone can be classified by transducer, form factor, and pickup pattern. A dynamic microphone and a condenser microphone describe conversion technology. A boundary, gooseneck, lavalier, handheld, or shotgun describes physical design or intended use. Omnidirectional, cardioid, supercardioid, and bidirectional describe sensitivity by direction. One device has characteristics in all three categories.
Dynamic microphones are generally robust and do not require phantom power, but a model may need more preamp gain for quiet or distant speech. Condenser microphones are often sensitive and can provide detailed pickup; many require phantom power or another power source. Neither type is universally superior. The room, distance, available inputs, speech level, handling, and system compatibility determine suitability.
Pickup patterns
- Omnidirectional: receives sound broadly around the capsule. It can cover several nearby speakers but also collects room noise and reverberation.
- Cardioid: emphasizes the front and rejects more sound from the rear. It can improve source focus if aimed and positioned correctly.
- Supercardioid/hypercardioid: narrows the forward area and has a rear lobe; poor placement can miss a speaker or collect unexpected sound.
- Bidirectional: receives primarily from front and back with side rejection; it may suit two opposing sources but is less common in standard reporter layouts.
Pattern drawings describe ideal test conditions, not guaranteed isolation. Reflections, table vibration, distance, participant movement, and nearby loudspeakers change practical results. A directional microphone placed far away may sound worse than a close omnidirectional microphone.
Form factors and placement
A boundary microphone sits on a surface and can cover people around a table while reducing some comb-filter effects associated with a microphone just above that surface. A gooseneck keeps the capsule near a seated speaker and allows aiming. A lavalier moves with a participant but requires attachment, battery or transmitter management when wireless, and permission. A shotgun is directional but is not a magical long-distance courtroom solution; indoors, reflections and off-axis coloration can reduce clarity.
Placement principles:
- Put the microphone close enough for a strong speech-to-noise ratio without obstructing the speaker or proceeding.
- Aim directional nulls toward predictable noise when practical.
- Keep microphones away from paper shuffling, ventilation, vibration, and loudspeakers.
- Avoid relying on one microphone for widely separated participants when channels are available.
- Re-test after seating changes.
Cost versus quality
Price may reflect construction, consistency, service, accessories, or specialized performance, but it does not prove fitness for the job. Evaluate intelligibility, self-noise, durability, interference rejection, pattern consistency, connector reliability, and compatibility. A modest approved microphone properly placed can outperform an expensive studio microphone positioned badly in a reverberant room. Standardizing on tested models can also reduce setup errors and simplify spares.
Cables, connectors, and power
XLR connectors are common for professional balanced microphone lines and usually latch. TRS phone connectors can carry balanced mono or unbalanced stereo depending on wiring. USB microphones contain their own conversion and driver path; combining several independent USB devices can create clock and routing complications. Connector shape alone does not prove signal level or wiring.
Balanced connections help reject interference over longer runs when the equipment is designed for them. Inspect bent pins, loose shells, intermittent strain points, and damaged shielding. Route signal cables away from power supplies and trip hazards. Use cable ramps or approved securing methods without creating residue or accessibility problems.
Phantom power can energize compatible condenser microphones through a balanced cable. Confirm that the microphone and connected equipment support it before switching it on. Mute or lower monitoring before connecting or changing power to avoid loud transients.
Verification
Listen to each microphone through the recorded path while someone speaks from the expected position. Check normal and quiet speech, movement, paper noise, and overlap. Label the physical microphone, input, and track consistently. Selection ends only when playback proves that the intended voice is intelligible and separated enough for the assignment.
Exam application
A boundary microphone in the middle of a polished conference table captures four people but also every paper movement. A cardioid gooseneck placed near the witness improves that source but leaves counsel uncovered. The solution may be a planned combination of microphones and channels, not a claim that one pattern is always best. On exam questions, reject specifications presented without context. Ask which speaker, room, distance, connector, power method, and recording path are involved, then require recorded verification.
Which setup principle is most reliable for improving courtroom speech capture?