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JBL Synthesis SDEC-4500: A New Standard in System-Calibration Accuracy
JBL Synthesis SDEC-4500: A New Standard in System-Calibration Accuracy
It optimizes the performance of a JBL Synthesis system in any room, using more than 200 bands of fully parametric digital equalization that can be adjusted from 1/100 octave to 4 octaves wide at +15dB to – 15dB, between 20Hz–20kHz, to correct dips and peaks throughout the frequency range. The SDEC-4500 consists of two units, the SDEC-4500P processor and the SDEC-4500X output expander. The SDEC-4500 compensates for frequency response irregularities with far greater precision than has ever been available before, to deliver extraordinary sonic accuracy that meets or exceeds the standards for professional theaters.
The SDEC-4500 is capable of applying precise equalization to all of the left, right and center loudspeakers, both full range and actively bi- or tri- amplified, and up to ten surround loudspeakers and to multiple subwoofers with support for up to 6 discrete subwoofer outputs.
The SDEC-4500 also offers full interoperability with the Harman Audio Test System; automatic arrival-time calibration for all the loudspeakers in a multichannel system that is accurate to less than 1” of measured distance; an improved Auto-Film-Screen-Compensation feature that automatically corrects for the attenuation in high-frequency output that occur when a loudspeaker is located behind projection screens and full implementation of Harman proprietary Sound Field Management for improved bass response and linearity.
The Harman Audio Test System uses multiple microphones (eight for a JBL Synthesis system) to measure different locations in a room, and applies proprietary digital-signal processing to analyze and correct for the room’s frequency dips and peaks.
When used in a JBL Synthesis system, the Harman Audio Test System enables the achievement of flat in-room frequency response, or frequency correction to any desired target curve. Additional functions include automatic crossover optimization between the main speakers and the subwoofers in a multichannel system; automatic loudspeaker-level calibration; and a newly developed sound field management algorithm that minimizes the seat-to-seat variation in bass response.