The technology
The patented triangular membrane
How it works
Sound begins in the capsule
At the most fundamental level, a microphone’s character is defined by its capsule. Before electronics or amplification come into play, it is the membrane that first responds to sound. For Ehrlund, this is where honesty must begin.
Traditional condenser microphones rely on circular membranes—a design that has remained largely unchanged for decades. Due to their symmetrical geometry, these membranes naturally support standing wave patterns that allow vibrations to persist after the original sound has passed. This prolonged vibration, known as self-resonance, subtly colours the sound, smears fast transients, and affects phase coherence.
Why shape matters
Different membrane shapes dissipate energy at different rates.
Symmetrical forms tend to sustain resonance longer, while asymmetrical geometry allows vibrations to decay more quickly. By breaking symmetry, resonant energy is prevented from reinforcing itself over time.
The triangular membrane behaves fundamentally differently. By dispersing energy more evenly across its surface, vibrations stop faster and more predictably. The patented geometry also allows for optimized tensioning and improved airflow, resulting in faster transient response and greater stability.
Compared to round and square membranes, the triangular form minimizes sustained vibrations, resulting in improved transient response and a cleaner, more phase-accurate signal.
Reduced self-resonance
Asymmetrical geometry prevents standing waves and unwanted ringing.
Faster transient response
Vibrations decay more quickly, preserving speed, detail, and clarity.
Phase- and frequency-linear sound
Maintains coherence across the spectrum with minimal coloration.
What this means for the sound
In practical use, the reduction of self-resonance leads to clearer transients, improved phase accuracy, and a more natural sense of depth and space. The microphone responds instantly to the attack of a sound and lets go just as quickly, preserving detail without exaggeration.
With less coloration to correct, recordings require minimal EQ or processing. The microphone effectively disappears, allowing performances to be captured as they truly are—open, balanced, and honest.
Designed to reveal, not interpret
The patented triangular membrane is not about creating a signature sound. It is about removing obstacles between the source and the listener. Combined with ultra-low-noise, phase-linear electronics and meticulous Swedish craftsmanship, it enables Ehrlund microphones to capture sound exactly as it exists—nothing added, nothing taken away.