JBL S4800 Owner's Manual

Contents

In all cases, the left and rightamplifiers for each section must beidentical. Make sure that the inputsensitivity of the amplifier for eachsection is equal, or that input levelcontrols are provided to maintainthe proper low-to-mid/high bal-ance. If two identical stereo ampli-fiers are used, one may be locatednear each loudspeaker and drivelow- and high-frequency sectionsthrough short wire runs.NOTE: Input polarity must be thesame for both the low- and high-frequency sections. Some ampli-fiers invert polarity. If the polarity isreversed to one section, a discon-tinuity in response will be apparentin the crossover region. If a prob-lem is suspected, reverse thepolarity to either low- or high-frequency sections of bothloudspeakers. Amplifier polaritymarkings may not ensure correctpolarity connections.THE WOOFER GRILLEGrilles on the S4800 loudspeakersystem have been designed formaximum acoustical transparency.For the most critical listening, how-ever, JBL suggests removing thegrilles. The grilles are connectedby four pins inserted into fourholes on the face of the cabinet.To remove each grille, hold thegrille edges with your fingers andgently pull the grille away. Do notuse any tools to pry the grille off –this will damage the finish of thecabinet. To replace the grille, posi-tion the mounting pins over theholes and gently press until thegrille meets the enclosure.FINAL CHECKLIST• Connect and plug in all othersystem electronics.• Check all connections. If bi-wiring, make sure both shortingstraps are removed.• Make sure the HF Trim Switch2 is correctly set.The system is now ready for use.The S4800 speaker system is fullyfunctional as soon as it is set up.The amplifier power should notexceed 300 watts (RMS). Theremay be some subtle tonal changesin bass output over the first weekto 10 days of operation. These arecaused as the movement of thelow-frequency drivers becomesmore fluid and the parts settle in.This process is completely normalwith transducers of this caliber.14Figure 12. Connecting speaker wires usingbare-wire method.