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room correction
Take your audio system to the next level with a room correction service!
You've carefully set up your stereo system, perhaps spending an afternoon or even a day on it. You may well find yourself making small adjustments over the next few weeks or months to further optimize the result. This is part of the process, and the more you adjust your system, the more you will appreciate your unique hi-fi experience. With digital room correction, you can drastically improve your system and take it to the next level.
What is acoustic room correction?
Room correction (or digital room equalization) is a process that measures the acoustic behavior of your speakers in your room and optimizes it using DSP (digital signal processing). The room has a significant, sometimes very negative, influence on the sound of your speakers, particularly through frequency-dependent reflections that cause irregularities in the frequency response. Room correction offers the possibility of largely eliminating this influence, thus achieving a smooth frequency response at the listening position.
Essentially, this means you can place your speakers wherever they look best aesthetically, and room correction will ensure they sound precise and balanced.
There are several advanced room correction programs available, and many modern high-end amplifiers already have integrated systems. These include Audyssey, which is used in surround receivers from Denon and Marantz, and NAD, which works with DIRAC, a specialist in room correction software. The amplifier brand Lyngdorf has also developed its own system, RoomPerfect.
Do you need room correction?
Does the bass boom? Does that one note on the guitar always hurt your ears? Does the speaker in the corner sound louder? Does everything sound a bit muddy? If you know what I'm getting at, then you probably already know the answer.
Once you've done a good room correction, the results can be overwhelming. Many report hearing details they missed before, noticing a new sense of space and clarity, and can't believe how much better the music sounds.
The sound is more balanced and controlled, as certain frequencies are not overemphasized or completely lost. The playback is therefore less tiring, so you can enjoy your music for longer and more comfortably. Above all, by matching the speakers to each other (the left speaker never "sees" the same room as the right speaker), instruments can be located more clearly, and the stereo image and depth layering become more precise.
Source: https://www.dirac.com/live/
How does room correction work?
Room correction takes place in two phases: measurement and correction. Regardless of the software used, the first step is to capture the room with a special measurement microphone (usually an omnidirectional condenser microphone with an extremely flat frequency response). The software then collects data at several positions in the listening position, for example, on the sofa, by repeatedly measuring so-called frequency sweeps (sliding tone test, 20 Hz-20 kHz). The sum of this data represents an acoustic image of the room at the measured positions.
The software then creates a series of equalizer settings (and possibly phase shifts) that are adjusted to a so-called target curve . These settings are exported from the software and imported into the DSP device that precedes the final amplifier.
Measurement as Evidence: Before-After Comparison
As clearly shown in the graph below, the lower to upper midrange is particularly strongly influenced by room modes. Too much low midrange and the sound becomes muddy; too much midrange and the sound becomes nasal and strained; too much high midrange and the sound becomes tinny and harsh. A slight overemphasis on the bass also leads to a muffled sound. The overall result is an uncontrolled, imprecise, and strained sound.
Room correction achieved the most linear frequency response possible, following the target curve. This target curve ensures a linear decrease in sound from the bass to the treble, which we find particularly pleasant.
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