OC18 Large Diaphragm

The Austrian Audio OC18 is a large-diaphragm cardioid condenser microphone that blends modern innovation with classic design, making it a reliable and versatile choice for any studio. Handcrafted in Vienna, it is built around the patented CKR6 ceramic capsule — a single-diaphragm version of the flagship CKR12 — delivering pristine clarity, natural warmth and unmatched consistency.

Thanks to Austrian Audio’s proprietary Open Acoustic Technology, the OC18 minimises internal resonance for a clean, transparent sound across all sources. It also features a switchable analogue high-pass filter (40 Hz, 80 Hz, 160 Hz) and two pad options (-10 dB, -20 dB) to ensure flawless performance, even with high-SPL instruments.

Factory Matched

Every OC18 is precision-measured for consistency and is guaranteed to match seamlessly with any other OC18, or even an OC818 in cardioid mode — giving you effortless flexibility for stereo or multi-mic setups. Whether for vocals, acoustic instruments, drums or ensembles, the OC18 is engineered to become a permanent fixture in your mic locker.

Key Features

• Handmade CKR6 ceramic capsule for consistent, stable performance
• Open Acoustic Technology for reduced internal resonance
• Cardioid polar pattern with vivid clarity and detail
• Switchable analogue high-pass filters (40 Hz, 80 Hz, 160 Hz)
• Selectable pads (-10 dB, -20 dB) for high-SPL applications
• Matched-pair ready with any OC18 or OC818 (cardioid mode)
• Handmade and tested in Vienna

In The Box

• OC18 microphone
• OCS8 Shockmount
• OCH8 Mic clip
• OCW8 Windshield
• Carry case

Additional Accessories

• SB1 Stereo Bar
• OCP8 Pop Filter

Technical specs

• Polar pattern: Cardioid
• Frequency range: 20Hz - 20kHz
• Sensitivity: 13 mV/Pa
• Equivalent noise level: 9 dB (A)
• Max. SPL: 148 dB SPL (158 dB SPL)
• Analogue low cut filter: 40Hz, 80Hz, 160Hz
• Switchable pad: -10 dB, -20 dB
• Impedance: 275Ω (symmetrical)
• Load impedance: > 1kΩ
• Supply voltage: 48V (<2.2mA)
• Main connector: XLR 3 pin
• Dimensions: 157 x 63 x 35 mm
• Weight: 335g