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Heiserman Audio Type-21 Large Diaphragm Condenser

Condition: New
SKU Type-21 Categories , Tag Brand:
Condition: New

Heiserman Audio Type-21 Large Diaphragm Condenser

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$1,499.00

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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″)
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WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. 
For more information go to www.P65Warnings.ca.gov.

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