Accurate Sound 'Digital Room Correction Calibration Service': The Science-based Remote Room Correction Service bringing Even and Clear Bass Response and Enhanced 3D Image of Your Sound
The Canadian professional calibration service provider and audio software developer Accurate Soundhas introduced its 'Digital Room Correction (DRC) calibration service' — The science-based remote room correction service bringing even and clear bass response and enhanced 3D image of your sound. This service is unique in that the company uses the physical dimensions of client’s room to calculate the optimum DRC filter.
The company’s science-based approach is to fully correct the bass frequencies, reducing the amount of correction through the diffusion zone, and only correct the direct sound after the diffusion zone. So the clients can get even and clear bass response without changing the characteristics of their loudspeakers. In addition, the 3D image is enhanced as the loudspeakers and room response are identical in both frequency and time domain. As a result, clients can experience more clear and focused the stereo phantom center image.
The main reason why we need digital room correction is as follows — Every room suffers from what is called "room modes". Room modes affect the evenness of the sound of the bass. Some bass notes disappear while other notes sound too loud. The reality is that your room is in control of bass frequencies, not your loudspeakers. As noted acoustician Floyd Toole says "In the inverstigation of many rooms over the years, I would estimate that something like 80% have serious bass coloration."He also mentioned about his research in a forum such that"...about 30% of the factors influencing our judgement of sound quality relate to bass performance - and this is dominated by the room, only correctable in-situ. So, ANY loudspeaker can sound better after room EQ, so long as it competently addresses the bass frequencies...".
The main purpose of the DRC calibration service is in the reproduction of accurate sound. There are two point of views in describing accurate sound. First, the subjective point of view explains accurate sound as the sound arriving at our ears that matches as closely as possible to the content on the recording. Second, the objective point of view describes accurate sound as the sound arriving at our ears at the listening position without frequency and timing response distortions. We are used to measuring or hearing flat frequency response with no phase shifts as the norm in the digital audio era. When it comes to loudspeakers in rooms, however, the signal arriving at our ears is far from being the ideal response both in the frequency and time domains. The company says that it is possible to accurately reproduce the incoming signal to our ears at the listening position without any frequency or time domain distortion. In addition to objective measurements, the subjective listening section characterizes what accurate sound reproduction should “sound” like. This is the viewpoint of loudspeakers in rooms.
As you can see the picture above, below the room’s transition frequency of about 300Hz, the bass response varies significantly, not only by location, but also in each location. Above 300Hz, the loudspeaker is in control of the frequency response that we perceive. Thus, below a room’s transition frequency, room modes, standing waves and room resonances dominate the sound, so much so that the room is in control of the low-frequency response. This is why we have uneven bass responses within our listening rooms.
The process of Digital Room Correction (DRC) by Accurate Sound is as follows — Once an acoustic measurement is made, the DRC software extracts the minimum phase response. Then by inverting the amplitude response and applying it as a filter to the measured response, the result is a flat frequency response. By EQ’ing the amplitude response, the phase response is also adjusted, as it is a minimum phase system. Then the DRC software, independently of the minimum phase correction, also corrects the excess phase (i.e. low-frequency room reflections) response towards the minimum phase response so that one ends up with the ideal low frequency and phase response across a listening area.
Up to 6 custom designed DSP (Digital Signal Processing) FIR filters tailored to your personal preference for tonal response while taking care of room effects for one system. The process is incremental and iterative.
All design artifacts including target design, frequency dependent windowing settings, etc. are delivered at the end of the process.
A short video using your measurements to walk through the analysis, design and filter generation process so that you can replicate was what done. Includes tips and tricks for further experimentation.
More about the calibration service
Accurate Sound was first to offer remote Digital Signal Processing (DSP) calibration services for tuning commercial and consumer audio sound systems to industry standards. The company makes it easy.
Here is the process:
Measure your loudspeakers in your room - The company can help!
Send the company your measurement file, room dimensions and pics.
The company designs the best FIR DRC filter possible.
Load the FIR correction filter into your music player.
The company fine tunes the tonal response to your preference.
Accurate Sound is the Canada-based professional calibration service provider and audio software developer. We help deliver studio quality sound worldwide, headphone by headphone, room by room for any setting. Mitch Barnett, the founder of Accurate Sound, worked as a professional recording and mixing engineer for 10 years and a professional software engineer/architect over 25 years. He has been EQ’ing loudspeakers in rooms for 35 years and working for DSP calibrations for 2 years.
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