JBL Complete Guide to Setting Up Your S4800 Speaker System

In all cases, the left and right amplifiers for each section must be identical. Make sure that the input sensitivity of the amplifier for each section is equal, or that input level controls are provided to maintain the proper low-to-mid/high bal- ance. If two identical stereo ampli- fiers are used, one may be located near each loudspeaker and drive low- and high-frequency sections through short wire runs.

NOTE: Input polarity must be the same for both the low- and high- frequency sections. Some ampli- fiers invert polarity. If the polarity is reversed to one section, a discon- tinuity in response will be apparent in the crossover region. If a prob- lem is suspected, reverse the polarity to either low- or high- frequency sections of both loudspeakers. Amplifier polarity markings may not ensure correct polarity connections.

Figure 12. Connecting speaker wires using bare-wire method.

THE WOOFER GRILLE

Grilles on the S4800 loudspeaker system have been designed for maximum acoustical transparency. For the most critical listening, how- ever, JBL suggests removing the grilles. The grilles are connected by four pins inserted into four holes on the face of the cabinet.

To remove each grille, hold the grille edges with your fingers and gently pull the grille away. Do not use any tools to pry the grille off – this will damage the finish of the cabinet. To replace the grille, posi- tion the mounting pins over the holes and gently press until the grille meets the enclosure.

FINAL CHECKLIST

•Connect and plug in all other system electronics.

•Check all connections. If bi- wiring, make sure both shorting straps are removed.

•Make sure the HF Trim Switch 2is correctly set.

The system is now ready for use. The S4800 speaker system is fully functional as soon as it is set up. The amplifier power should not exceed 300 watts (RMS). There may be some subtle tonal changes in bass output over the first week to 10 days of operation. These are caused as the movement of the low-frequency drivers becomes more fluid and the parts settle in. This process is completely normal with transducers of this caliber.

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