Neutral acoustics for recording, mixing and mastering.
A control room is a working tool. If the space colors the signal, the engineer fights the room instead of the mix. Bass that’s flat in the studio turns out boosted or scooped on other monitors — and the track has to be redone.
The main mistake is thinking neutrality is bought with a monitor’s price tag. Harman science (Toole and Olive research) shows the opposite: a monitor’s on-axis response describes only the first sound to reach the ear, while in a room the listener perceives mostly the reflected field. By Harman’s weighting, direct sound is about 12% of the timbre, with early reflections and late energy at 44% each. A flat on-axis response does not equal even sound at the mixing seat.
Every space has a transition (Schroeder) frequency around 300–500 Hz. Below it the sound is ruled not by the monitors but by the room modes and boundary effects — standing waves, dips, and peaks. This is physics, not a question of budget.
Toole and Olive research gives the numbers. Below 300–500 Hz the placement of the monitor and listener relative to boundaries gives a spread of more than 18 dB in the response, and between different rooms below 100 Hz up to 25 dB. For comparison: amplifiers and DACs in level-matched blind tests give a difference of less than 1 dB. The room’s damage is an order of magnitude larger than electronics errors — and it’s cured by neither a more expensive monitor nor a cable.
Modal resonances are minimum-phase distortions, i.e. physically correctable. But they must be corrected in the room itself and through calculated calibration, not by picking the «right» monitor. A neutral transducer alone is powerless against modes: bass is the one area where physics guarantees the room damages the signal, and a monitor’s neutrality by itself does not cure it.
A common studio-calibration mistake is to drive the response into a flat line. Peter Lyngdorf states it plainly: «Making a flat frequency response the target curve is a mistake unless you live in an anechoic chamber.» This is a confirmed thesis, not a contested one.
The correct target in a real room is a gentle downward tilt, confirmed by Olive’s blind tests. Our calibration separates the system signature from the room’s problems and corrects only what the room spoiled — rather than repainting the sound into an artificially flat one. That gives the engineer a reference they can rely on: what the measurement shows is what they hear at the mixing seat.
Drives the on-axis response into a straight line. Ignores that in a room the listener hears the reflected field. Chokes the top end, creates an unnatural, «lab» timbre you can’t rely on when mixing for real playback systems.
Separates the system signature from the room’s damage, as in RoomPerfect. Corrects only the room’s problems. The target curve is an honest gentle downward tilt. The strongest correction is in the 30–60 Hz modal region, where physics guarantees the room damages the signal.
The Grimm Audio school adds something important: neutrality matters more than a «house» sound. The house sound of expensive monitors masks deviations from linearity, and a mastering reference needs precisely an honest neutral stereo pair, not an array of speakers. At the same time, the diaphragm material is not the point: Grimm swapped a beryllium tweeter for a carbon-fiber one with near-identical measurements and cleaned up the remainder with DSP. The differentiator is systems engineering for the room, not an exotic «box.»
Once the room is designed, what remains is the time-domain honesty of the system itself. A passive crossover is a minimum-phase network with frequency-dependent group delay: low frequencies are delayed more than high ones. This is audible. The audibility thresholds for group delay are around 0.5–2 ms (Blauert & Laws, Aalto/Mäkivirta work), and phase anomalies matter most precisely in the bass, 50–300 Hz.
The Backes & Müller school solves this with an active path with motional feedback: a sensor on each driver measures the cone’s movement and corrects it in real time. Acceleration feedback gives more than 10 dB of distortion reduction at low frequencies — exactly where bass control breaks down in a studio. This is a physically correct lever of precision, unlike betting on an expensive passive «box.»
We don’t sell a number of speakers or a «house sound» — we run by measurement. The scan lets us design around the modal map and boundary geometry, that is, attack exactly the room’s 18–25 dB errors that electronics can’t cure.
No. A monitor’s on-axis response describes only the first arriving sound, while in a room the engineer mostly hears the reflected field — by Harman’s weighting, direct sound is about 12% of the perceived timbre. Olive’s blind tests show that perceived quality is predicted with a 0.86 correlation from the speaker and the room, not from the electronics’ price. Without designing for the space, even a reference monitor will lie in the bass.
Because a flat target curve outside an anechoic chamber is a mistake. This is Peter Lyngdorf’s explicit position and a fact confirmed by Olive’s blind tests: the correct target in a real room is a gentle downward tilt. We correct only the room’s damage rather than repainting the sound into an artificially flat one, so that the reference stays honest.
Especially needed. Below the 300–500 Hz transition frequency the room owns the bass: placement and boundaries give a response spread of more than 18 dB, and between different rooms below 100 Hz up to 25 dB. These are minimum-phase distortions, fixed by room treatment and calibration, not by monitor choice. Without calculated bass traps the engineer won’t hear the real bass, and the track will fall apart on other systems.
A fact in the time domain. A passive crossover is a minimum-phase network with group delay: bass is delayed more than the top end, and the audibility thresholds for delay are around 0.5–2 ms. An active path with motional feedback (the Backes & Müller school) measures the cone’s movement and gives more than 10 dB of distortion reduction at low frequencies. But even this is secondary to the room: first we design the space, then an honest time-domain system.
Describe the space and the task — we’ll reply within 2 hours with a preliminary estimate