AKG C391 B High Performance Condenser Microphone
Description
AKG C391 B High Performance Condenser Microphone
The AKG C391 B is a compact cardioid condenser engineered for pristine vocal tracking, acoustic instrument recording, and drum mic'ing. Its lightweight, ergonomic design—just 115 grams and 146 mm in length—fits seamlessly into fixed studio setups or mobile session work. The microphone captures transparent, detailed audio with excellent off-axis rejection, rewarding disciplined mic technique with honest, studio-grade recordings that translate across playback systems.
Recording & Mix Integration
A flat 20–20,000 Hz frequency response ensures accurate tonal capture with no colored character obscuring source detail, while the 77 dB-A signal-to-noise ratio and 17 dB-A equivalent noise level keep the noise floor low during tracking and overdubs. Maximum SPL handling of 132 dB (1% T.H.D.) or 142 dB with the 10 dB pad engaged provides sufficient headroom for close-mic'ing loud sources without saturation or unwanted distortion artifacts.
Studio Control & Workflow
The cardioid polar pattern delivers controlled source isolation and natural rejection of room reflections and off-axis leakage, essential for capturing clean, focused takes in untreated or mixed-purpose spaces. A switchable 10 dB preattenuation pad and 12 dB/octave high-pass filter below 75 Hz eliminate stage-time parameter hunting, while the modular capsule system enables future sonic customization. Balanced XLR 3-pin connection with 9–52 V phantom power compatibility integrates directly into standard professional recording chains and interfaces.
Key Features
- Cardioid condenser microphone with precise directional pickup
- Frequency range: 20–20,000 Hz
- Sensitivity: 10 mV/Pa
- Maximum SPL: 132 dB (1% T.H.D.) / 142 dB with pad engaged
- Signal-to-noise ratio: 77 dB-A
- Equivalent noise level: 17 dB-A
- Switchable 10 dB preattenuation pad
- Switchable 12 dB/octave high-pass filter (below 75 Hz)
- Phantom power: 9–52 V, 2 mA current draw
- Balanced XLR male 3-pin connection; 200 ohm impedance
- Compact dimensions: 19 mm diameter × 146 mm length; 115 g weight
- Modular design with interchangeable capsule system
The C391 B combines precision engineering with session-ready flexibility, delivering the transparent, artifact-free sound that professional recording and studio production demand.
More Information
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At a Glance
The AKG C391 B is a precision cardioid condenser that reproduces vocals, acoustic instruments, and drums with crystalline clarity and minimal noise, ideal for tracking in home or project studios where accurate detail matters. Its flat 20–20,000 Hz response, 77 dB-A signal-to-noise ratio, and switchable pad and high-pass filter give you corrective tools during recording and the headroom to capture loud sources without distortion. Its modular capsule design and balanced XLR connectivity integrate seamlessly into standard recording chains, making it a versatile workhorse for mixed-genre sessions.
Who This Is For
Great for
- ✓ Studio Sessions
- ✓ Home Recording
- ✓ Live Performance
- ✓ Vocal Recording
- ✓ Acoustic Instruments
Not the best pick for
- – Beginner Practice
- – Casual Podcasting
Skill level: Intermediate · Advanced · Professional
Frequently Asked Questions
What is the signal-to-noise ratio and equivalent noise level?
The C391 B has a 77 dB-A signal-to-noise ratio and 17 dB-A equivalent noise level, ensuring minimal background noise in demanding recording environments and live settings.
Can it handle loud sources like drums or guitar amps?
Yes. Maximum SPL is 132 dB (1% T.H.D.) at standard setting, or 142 dB with the switchable 10 dB pad engaged, giving you plenty of headroom for loud sources without distortion.
What are the switchable controls and how do they work?
The microphone includes a switchable 10 dB preattenuation pad to manage loud sources and a 12 dB/octave high-pass filter below 75 Hz to reduce rumble and proximity bass.
What kind of polar pattern and rejection does it have?
The cardioid polar pattern provides controlled pickup with natural rejection of off-axis sound, offering excellent feedback rejection critical for live and mixed recording environments.
Is the capsule user-replaceable or customizable?
Yes, the modular capsule system allows future customization and interchangeability, extending the microphone's versatility over time.