JBL Synthesis

Name: JBL Synthesis
Brand: JBL

A brand built on the claim that the people who mix movie sound for a living choose the same speakers in their own homes.

Overview

The JBL Synthesis name doesn't attach to a single box. It's a line of home theater and high-end audio systems and processors. The fact sheet for this entry is empty, so what follows comes only from period advertising and the surviving service documentation. Treat "Synthesis" as a family designation, not a model number. Anyone hunting one of these on the used market needs to know which S-series component they're actually buying before money changes hands.

The most concrete documentation in circulation is the service manual for the Synthesis S-650 power amplifier. It describes an amplifier module with schematic diagrams and PC board layouts for the main (front) power sequencer board and the rear sequencer board. It gives a rated output into 8 ohms with a 0.05% distortion figure at 8 ohms. The manual specifies idling current adjustment at a target of 7 mV (19 mA), measured between test pins on the P701 board via a semi-fixed resistor. A reference table shows the value climbing from roughly 3.5 mV shortly after power-up to a stable 7 mV after ten minutes. The amp was clearly designed to be serviced, not thrown away.

The S-650 service literature also lays out what a tech needs on the bench: distortion analyzer, audio oscillator, AC VTVM, oscilloscope, circuit tester, DC VTVM, AC wattmeter, line voltmeter, variable autotransformer, and a shorting plug for noise pickup elimination. Power consumption is listed at 230 watts full rated output into 3 ohms and 300 watts at 10% THD into 8 ohms, with a signal-to-noise ratio above 116 dB A-weighted. Rated power output spans 1 to 8 ohms RMS.

Period advertising is where the Synthesis line's identity really lives. Mix-Magazine (March 2002, p.115) ran a campaign built around a single statistic: JBL is the choice in six out of ten movie theaters worldwide, and JBL systems are overwhelmingly chosen by prestigious recording studios for their accuracy. The same ad copy noted that professionals who use JBL every day choose JBL Synthesis digital home media systems for their own homes. That's marketing, not an independent verdict, but it's the claim the whole line was sold on.

A second Mix-Magazine placement (October 2001, p.53) called the Synthesis home theater "your everyday ticket to the true excitement of home cinema," pitched by "the company that has forever been synonymous with movie sound." The line was positioned as a direct pipeline from JBL's professional theater business into the living room. The available documentation doesn't say whether that pipeline delivered.

Independent review coverage is thinner. Audio (September 1992, p.23) judged that Synthesis One was better than the standard systems used by most film post-production houses in their dubbing rooms. The review noted JBL's use of certain drivers paired with the traditional JBL theater approach.

By 1995 the line had expanded into a full THX-certified powered system. Audio (October 1995, p.268) listed the JBL Synthesis 3 as a THX, powered seven-piece system in black lacquer, priced at $18,900 with amplifiers, equalizer, and THX unit. The S3M was listed as the main channel speaker with a pair of 6-inch drivers. This was never budget gear.

The documentation does not establish production years for the line as a whole, or for any individual Synthesis component. The fact sheet carries no dates, no pricing beyond the 1995 review, and no dimensions or weight. Anyone claiming a specific production run for a given Synthesis model is working from something other than the sources here.

Synthesis is a moving target. The S-650 amplifier has real service documentation and a published idling-current spec. The Synthesis 3 was an $18,900 THX system in 1995. Synthesis One earned a favorable comparison to post-production dubbing rooms in 1992. Those are three different products under one banner.