Type-21

From Heiserman:

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.

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.

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.