Two Stereo Microphones
A single high-quality stereo microphone can already capture a room with remarkable coherence. Adding a second does not simply create more signal—it opens a much broader creative field.
Different perspectives can suddenly be combined: intimacy and distance, direct sound and room, classic stereophony and immersive playback. An ensemble can be perceived not only with precise localisation, but as a spatial whole.
01 / The pair
Four capsules, many perspectives
The two microphones can be used as a shared system or independently. This allows different stereo arrangements to be combined—for a precise centre, a wider representation of the room or an additional rear perspective.
With larger ensembles, choirs or acoustically interesting spaces, this creates recordings that can be shaped much more freely later. Four carefully matched signals are also a valuable foundation for surround, Dolby Atmos and other immersive productions.
Because both microphones were built by hand, they share not only the same technical idea, but also a visible and sonic signature.
The advantages of the pair
More freedom before and after recording
01 / Flexibility
Several stereo ideas in one setup
Different distances, angles and polar patterns can be combined. Depending on the instrument and room, this creates a distinct balance of precision, width and depth.
02 / Immersion
A basis for spatial formats
Four capsule signals make it possible to capture additional spatial directions alongside a classic stereo image and later prepare them for surround, binaural or immersive playback.
03 / Character
No production model, no standard sound
Bodies, capsules and tuning were chosen deliberately. The result is not a neutral construction kit, but a pair with its own identity and reliable coherence.
02 / The capsule
Flat K47: clarity without harshness
At the heart of both microphones is an Arienne Audio “Flat K47”. Its construction draws on the familiar K47 family, while avoiding the characteristic stronger presence in the upper midrange.
It was initially made in small quantities in Michigan and later entered regular production due to demand. For my stereo pair, the remarkably consistent tuning was decisive: front and rear are closely matched in sound, making variable polar patterns and spatial techniques more dependable.
The capsule provides a calm, detailed foundation. Vocals, speech, acoustic instruments and amplifiers can be captured precisely without an obvious treble emphasis pushing itself forward.
Sonic character
Neutral enough for decisions, alive enough for music
01 / Tuning
Refined and understated
The frequency response remains balanced. The signal therefore feels clear and open without imposing a pronounced presence boost on voices or instruments.
02 / Application
From vocals to guitar amps
The capsules suit both individual sources and complex rooms. Their restraint leaves room for positioning, mixing and later sound shaping.
03 / Matching
Coherence from four signals
The more similarly the capsules respond, the more stable the spatial image remains. In stereo and multichannel recording, this consistency matters more than spectacular individual traits.
The real strength
Two identical capsules are only the beginning. What matters is how coherently the pair responds as a spatial tool.
03 / The sonic universe
One microphone, many possible voices
I do not use the two microphones only as a stereo system. Individually, they also work for vocals, speech, acoustic instruments and guitar amplifiers.
The linear character of the Flat K47 capsules provides a strong starting point. In post-production, modelling tools can guide the signal in different sonic directions—from restrained and modern to more strongly coloured vintage characters.
Polar pattern, proximity effect and off-axis behaviour can also be varied later in the appropriate workflow. This does not replace careful microphone placement, but expands the options when an arrangement needs a different perspective in the mix.
04 / Ambisonics
From a stereo pair into three-dimensional space
Ambisonics describes space not only as left and right, but through directional components that can later be decoded for different loudspeaker layouts or binaural playback.
In my setup, the two stereo microphones are placed as close together and as symmetrically as possible. The four signals are then transferred into an Ambisonics workflow. The neutral recording becomes a format that can be delivered as stereo, surround, 360° audio or a headphone mix, depending on the destination.
The linear tuning of the capsules is helpful here: the less intrinsic coloration arises between channels, the more cleanly direction and space can be shaped in further processing.
The workflow
Record, encode, open for the target medium
01 / Setup
Close and symmetrical
The microphones are positioned so that their four capsules capture a spatial field as coherently as possible.
02 / Processing
Four channels become spatial information
The individual tracks are combined and monitored as an Ambisonics signal through a suitable encoder and decoder chain.
03 / Output
One source, several playback formats
The same recording can produce classic stereo versions, binaural headphone versions or immersive loudspeaker mixes.
Advantages
A space that can be reinterpreted later
- Natural spatial impression for ensembles, choirs and acoustic instruments
- Flexible delivery for different loudspeaker and headphone formats
- A future-ready foundation for 360° video, VR and immersive audio production
Limitations
Spatiality requires control
- Encoders, decoders and signal paths must match the chosen geometry
- Microphone position, room acoustics and playback system strongly shape the result
- A four-channel setup offers considerable freedom, but does not reach the directional resolution of higher-order Ambisonics