How Microphones Work
Microphones are transducers that convert acoustic energy (sound waves) into electrical energy (audio signals). Different microphone types use various methods to achieve this conversion, each with unique characteristics.
Transduction Methods
Dynamic: Moving coil generates signal. Condenser: Capacitor plates change distance. Ribbon: Metal ribbon moves in magnetic field. Carbon: Pressure changes resistance (vintage). Piezo: Crystal generates voltage.
Key Specifications
Frequency Response: Range and coloration. Sensitivity: Output level for given input. SPL Handling: Maximum sound pressure. Self-Noise: Inherent electronic noise. Polar Pattern: Directional pickup.
Dynamic Microphones
Characteristics
- • No external power required
- • Excellent for high SPL sources
- • Rugged and reliable construction
- • Less sensitive to humidity/temperature
- • Often more affordable
- • Focused frequency response
Best Applications
- • Live vocals and performance
- • Guitar amplifier recording
- • Drum recording (snare, toms)
- • Loud brass instruments
- • Broadcast and podcasting
- • Budget home recording
Famous Dynamic Mics
Industry Standards
Shure SM57: Industry standard for instruments
Shure SM58: Legendary vocal mic
Electro-Voice RE20: Broadcast favorite
Sennheiser MD421: Versatile studio workhorse
Condenser Microphones
Characteristics
- • Requires phantom power (+48V)
- • Highly sensitive and detailed
- • Wide frequency response
- • Low self-noise (quality models)
- • Fast transient response
- • More fragile than dynamics
Best Applications
- • Studio vocal recording
- • Acoustic instruments
- • Overhead drum mics
- • Room ambience capture
- • Classical and orchestral recording
- • Detailed source capture
Famous Condenser Mics
Industry Standards
Neumann U87: Studio legend
AKG C414: Versatile multi-pattern
Audio-Technica AT2020: Budget favorite
Rode NTK: Tube warmth
Ribbon Microphones
Characteristics
- • Vintage, warm tone character
- • Natural compression and smoothness
- • Figure-8 polar pattern typically
- • Fragile ribbon element
- • Lower output than condensers
- • Excellent for harsh sources
Best Applications
- • Guitar amplifiers (mellows harshness)
- • Brass instruments
- • Vintage vocal sounds
- • Drum overheads (smooth cymbals)
- • String sections
- • Room ambience with character
Famous Ribbon Mics
Industry Standards
Coles 4038: BBC vintage classic
Royer R-121: Modern ribbon standard
RCA 44: Iconic vintage broadcast
AEA R84: Affordable vintage tone
Microphone Polar Patterns
Cardioid (Heart-shaped)
- • Picks up front, rejects rear
- • Most common pattern
- • Good isolation
- • Proximity effect
- • Ideal for most sources
Omnidirectional
- • Picks up all directions equally
- • Natural room sound
- • No proximity effect
- • Less handling noise
- • Ambient recording
Figure-8 (Bidirectional)
- • Picks up front and rear
- • Rejects sides completely
- • Great for two-person recording
- • Strong proximity effect
- • Natural for ribbon mics
Recording Techniques
Vocal Recording
Close Miking (6-12 inches): Intimate, present sound. Good isolation. Use pop filter. Watch for proximity effect.
Distance Miking (2+ feet): More natural, roomy sound. Includes room acoustics. Requires good acoustic space.
Instrument Recording
Guitar Amplifiers: Close: SM57 on speaker cone edge. Room: Condenser 3-6 feet back. Combine close + room for depth.
Acoustic Instruments: Find the sweet spot by listening. Consider instrument resonance. Use room mics for natural sound.
Microphone Buying Guide
First Microphone ($50-200)
- • Large diaphragm condenser
- • Audio-Technica AT2020
- • Rode PodMic (dynamic option)
- • Good for vocals and instruments
- • Includes basic accessories
Home Studio Pair ($200-600)
- • Large diaphragm condenser
- • Dynamic mic (SM57/SM58)
- • Covers most recording needs
- • Shure SM57 + Audio-Technica AT2035
- • Pop filter and boom stands
Professional Setup ($600+)
- • Multiple pattern condenser
- • Specialty mics (ribbon, small diaphragm)
- • Matched pairs for stereo
- • AKG C414, Neumann TLM series
- • Professional accessories
Microphone Care & Maintenance
Storage & Handling
- • Store in protective cases or pouches
- • Avoid extreme temperatures and humidity
- • Handle by the body, not the grille
- • Keep away from magnetic fields
- • Transport carefully to prevent shock
- • Use shock mounts to reduce vibration
Cleaning & Service
- • Clean grilles gently with soft brush
- • Wipe body with slightly damp cloth
- • Never use solvents or harsh chemicals
- • Service condensers every few years
- • Check cables and connectors regularly
- • Professional calibration for critical work