System/Room Analysis and Measurement (SAM)

The Acoustic Design Review (ADR) is a qualitative analysis of a system design meanwhile the System/Room Analysis and Measurement (SAM) is a quantitative measurement of performance. The SAM is performed by the calibrator using a real time analyzer (RTA) and an Energy Time Analyzer (ETA). The data collected by these instruments is transferred to several computer software programs for analysis. A SAM also involves critical listening to judge performance. The analysis is used as a objective review of the actual performance of a system and room. Used in conjunction with the ADR it is the second half of a complete system review. The technician reviews actual measured performance and makes adjustments in the context of desired acoustical goals.

These goals include:

• Clarity: Clear understandable dialogue, low level sonic detailing.
• Focus: Localization of sounds within the front sound stage.
• Impact: Dynamics: dynamic contrast, clarity even when at peak sound levels.
• Smooth Response: Minimize the booms, ringing and shrills, correct timbre.
• Sonic Envelopment: Smooth front to back panning, swimming in sound.
• Large Sweet Spot: Each listener should hear the above qualities

Another element included in the SAM is a diagnostic review of system operation. Simply put, there is no point searching for acoustical problems in a design without making sure all components are functioning properly, correctly wired and installed.

A typical SAM usually includes ADR services but does not include more complex redesign or acoustical treatments. Depending on SAM findings, a basic calibration may not be feasible if room or equipment problems are significant. The final conclusion of the ADR/SAM process may result in the creation of an Advanced Calibration Plan (ACP) if necessary. Calibration of a system or tuning of the room is not a cookie cutter proposition. Each system/room is different. Equally important is the level of flexibility each client has regarding recommended layout changes or budget limitations. The SAM process is required to properly calibrate the system, providing an objective profile of the system before and after calibration.

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