Tech Focus: Audio Monitoring, Part 1 - Room-Correction Software Aims To Optimize Any Environment
13/08/2020
Thursday, August 13, 2020 - 7:00 am
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A great speaker can quickly become a mediocre one when placed in an especially challenging space. The audio compartment of a production truck is the ultimate Petrie dish for this phenomenon, one that becomes even more complex when audio mixes have to move between different spaces and through an assortment of different speakers.
In response, speaker manufacturers have been developing and refining so-called room-correction systems: software that can aurally analyze a particular space's metrics, such as its size and reflectivity, and adjust performance of the speakers to that environment.
The market for these has grown nearly exponentially in recent years, driven by software developers joining the loudspeaker makers. Top-ten (and top 11) lists of them have become common.
Various brands have developed these room-correction products. Some began by focusing on LFE correction - for instance, JBL's Intonato 24 system works solely below 500 Hz - but all are designed to optimize frequency response to those of the spaces they're used in.
Although speaker-calibration solutions have their differences, they all need a point of reference in order to function. This takes the form of a measurement process that captures a snapshot of monitor performance from a listening position based on several swept-tone passes. The resulting profiles from this process, along with a predetermined target curve (that is, a flat or ideal frequency response), are the two main components of speaker calibration. The effects of these two curves result in what are called after curves, which compensate tonal issues using EQ within each monitor channel but also work to improve the phase relationship between monitors, as well as improving stereo and multichannel imaging.
Frequency Management JBL Intonato 24 monitor-management-tuning system
Housed in a 2RU rack-mount enclosure, JBL's Intonato 24 monitor-management-tuning system calibrates and controls up to 24 speakers configured as stereo, surround, or immersive audio systems. Though intended to be used with JBL's 7 Series master reference monitors, Intonato 24 is also compatible with other monitors; additionally, Harman's BLUlink network protocol allows Intonato 24 to be digitally networked with Harman's Crown power amplifiers. It features internal routing and a mixer to provide monitoring flexibility for a combination of up to 24 analog and digital sources, which can be patched, routed, and selectively monitored via any of the connected speaker or headphone systems. Up to four subwoofers can be assigned as bass-management subs with selectable crossover settings, and the same or different subwoofers can be used to reproduce the LFE channel. Complete configurations - speaker-setup parameters, EQ, subwoofer settings, input-source patching, down-mix preferences - can be stored as profiles and scenes and instantly recalled, even mid-session.
The room really doesn't create problems for monitors above 500 Hz, notes Chris Hansen, director, recording, broadcast, and content creation, Harman Professional. Low frequencies are where the room tends to be in control. If you can solve the low-frequency-management issues, then you've resolved most of your room-correction problems. That's what Intonato 24 does.
Genelec Loudspeaker Manager 3.0 (GLM 3.0) software manages connectivity to as many as 40 Genelec SAM studio monitors and subwoofers on the Genelec network. Version 4 with newly designed graphical user interface is now in beta. Version 4 software (compatible with Windows and Mac versions, including Catalina) will be able to manage connectivity for up to 96 Genelec SAM studio monitors and subwoofers on the Genelec network.
Genelec Loudspeaker Manager
The complete GLM control system includes a Genelec measurement microphone and universal microphone holder, a network adapter unit, and the GLM software. The GLM software, available for both Windows and Mac, features level adjustment, distance delays, and flexible room-response compensation equalization using Genelec's proprietary AutoCal automated calibration system. All parameters and settings are stored in system-setup files or saved in the individual studio monitor or subwoofer, in case the GLM network needs to be disconnected.
(Genelec's new G LearningLab educational program is slated to kick off this month with a series of tutorials focusing exclusively on the company's GLM loudspeaker-manager software. The training sessions will also be used to unveil GLM 4, the newest version of the software, which is currently in a public beta-test phase.)
Neumann's new Neumann.Control iPad app is a DSP package capable of in-room acoustic correction, using eight bands of parametric (IIR) EQ to adapt Neumann's KH 80 DSP loudspeaker to the individual room situation. A patented Guided Alignment algorithm enables filtering functions and room-adjustment options that adapt the system to its environment. The system can accommodate monitoring configurations from mono to 9.1 surround and can self-identify all loudspeakers on a network.
The Guided Alignment process takes the user through a set of simple questions about the room and the loudspeaker/subwoofer position; the app then adjusts the response of each loudspeaker/subwoofer accordingly. The iPad pairing, connected via a standard IP network with an Ethernet cable between the router and the monitor, offers features including switching between different setups and alignments, volume control, saving and recalling volume presets, dim, solo, mute,
LINK: | https://www.sportsvideo.org/2020/08/13/tech-focus-audio-monitoring-par... |
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