Type-21 Microphone

Classic 251 Soul, Modern Workhorse Heiserman Audio announces the Type-21, a large-diaphragm condenser microphone that captures the heart and soul of the legendary ELA M 251E in a compact, ultra-versatile package :: Type-21 delivers the depth, detail, and character engineers expect from Heiserman Audio in a rugged, phantom-powered format. Modern 251 character in a compact form :: At the core of the Type-21 is the same Generation 5 HK12 capsule found in the acclaimed Heiserman H251, hand-crafted by master technicians in the USA for consistency, nuance, and musicality. Packed into an all-aluminum body, the Type-21 employs a unique transformerless circuit built around a low-noise JFET, precision resistors, and carefully selected tantalum and film capacitors to deliver a rich, dimensional sound with exceptional clarity. This compact footprint makes it ideal for drum rooms, guitar cabs, vocal booths, and any confined space where a classic 251-inspired tone is needed without the bulk. Built to inspire and withstand daily use :: The Type-21 is engineered to handle whatever a modern session can throw at it, pairing studio-grade sonics with road-ready durability. A softly glowing Heiserman logo isn’t just for aesthetics - it is a functional part of the circuit and a visual cue that the mic is ready to work. Switchable polar patterns (cardioid, omni, and figure-8), a high-pass filter, and a -15 dB pad give engineers precise control at the source, whether taming low-end buildup or managing high-SPL instruments. Key features Hand-crafted Generation 5 HK12 capsule Stunning industrial design with softly glowing functional logo Switchable cardioid, omni, and figure-8 polar patterns High-pass filter and -15 dB pad for flexible source control Designed, machined, assembled, and fully made in the USA Technical specifications - Type: Large diaphragm condenser - Capsule: Generation 5 HK12 brass and acrylic chambered capsule - Diaphragm: Dual 6-micron, 24k gold-sputtered Mylar (PET film) - Power supply: +48 V phantom power via XLR - Frequency response: 20 Hz – 20 kHz - Max SPL: 130 dB (145 dB with pad) - Sensitivity: 20 mV/Pa ±1 dB - THD @ 1 kHz @ 1 Pa: <0.5% - Output impedance: 42 Ω - Amplifier type: Field Effect Transistor - High-pass filter: 160 Hz - Connector: Amphenol XLR - Mount: Standard 57-style mic clip - Dimensions: Length 138 mm (8.2"), width 50 mm (2"), thickness 28.5 mm (1.13")