JBL 4307 Owner's Manual

Contents

unpacking the speakers

2Thank YOu FOr ChOOsing ThisJBL ® PrODuCTThank you for purchasing this JBL speaker system. Please read thoughthis owners manual carefully before using the speakers,and then sit back and enjoy excellent playback sound made possiblethrough their correct connection and placement.unPaCking ThE sPEakErsWe recommend saving the cushioning and other packing materials, evenafter unpacking the product from the carton box. Harman InternationalJapan will not be responsible for damage caused by improper packagingwhen using materials other than those of the original carton box whentransporting the units for moving, repairs, or other reasons.PLaCEMEnT• The speakers are not magnetically shielded. Therefore, if placednear a CRT television, colors on the screen may become distorted. Ifthis occurs, move the speaker system slightly further away from thetelevision.• Speaker systems are durable consumer goods. Their lifespan can beshortened due to effects from temperature, humidity, ultraviolet light,etc. Please keep the speakers away from bright light fixtures and directsunlight, and from places with high temperatures, such as near theexhaust outlets of air conditioners or heaters. Also, please refrain fromplacing the speaker system in closed automobiles or next to windowswith direct sunlight.sPEakEr PLaCEMEnT• he environment in which speakers are placed generally has a stronginfluence on the sound quality of low frequencies. If you place thespeakers in corners of your room, lower frequencies will be enhanced,and while this will allow you to savor a rich, deep bass, it will also be adull sound with no edge. On the other hand, when placed away from thewall, the sound will be sharp and clean, even though you sacrifice someof the heavy bass. We recommend that you make the final decision onthe placement of the speaker system while actually playing some of yourfavorite music.• In order to get the best stereo effect, please place the left and rightspeakers at an equal distance to the left and right in front of the listener.While the sound field will become wider as more space is placed betweenthe left and right speakers, the stereo-image quality of center-orientedelements such as vocals will weaken. Please adjust the space betweenthe speakers to match the distance with the listening position.• The sound localization for these speakers is the center of the treble unit,and placing your ears at a listening position at this height will provide thebest sound localization and sound field. Adjust the height of the systemusing commercially available speaker stands and racks.COnnECTiOnsCAUTION: When connecting speakers to an amplifier, please do so afterturning the amplifier off. If you connect the speakers while the power is stillon, it could damage the amplifier and speakers.This speaker system uses color-coded speaker terminals, with red for +and black for −. Connect commercially available speaker cables to theterminals in back while paying attention to the polarity.*When using loose end cables on which the protective shield has beenpeeled back, please be careful that the metal parts of the terminal donot bite into the protective shield. This could interrupt sound due to poorconnection.Also, since there is the possibility of a short circuit if the leads of the cablestouch, please do not peel back too far on the protective shield.LEVEL aDJusTMEnTThe speaker system is equipped to allow users to adjust the levels for midand high frequencies, which are easily influenced by factors such as thesize and construction of the room. Adjust to your preferred tone using theknobs on the left baffle control panel on the unit while listening to musicwith which you are familiar. The upper “HF LEVEL” knob adjusts the levelof the high frequency tweeter, and the lower “MF LEVEL” knob adjusts themid level frequencies of the mid-range unit.The levels of each band increase when turning the knobs clockwise, anddecrease when turning them counter clockwise. The “0 dB” position is thestandard position for a normal listening environment.*The relationship between the volume level on the amplifier andthe amount of sound from the speakers can differ depending onthe characteristics of the equipment, such as the efficiency andimpedance of the speakers, output characteristics of the amplifierand the output level of the source equipment (such as a CD player),as well as the combination of these. When using this speaker systemin combination with an amplifier that has low output, if the bass isenhanced and the volume is raised to an excessive level using thetone control or other method, clipping will occur due to distortion inthe amplifier output, and this could damage the speakers even if thepower is below the maximum recommended amplifier input. If yousense any abnormalities in sound, please lower the volume.MainTEnanCEWhen the speaker set becomes dirty, wipe with a soft, dry cloth.Never use liquids that contain volatile solvents such as paint thinneror benzene to clean the system. Also, please be careful not to applyany spray pesticides.If the grille net becomes dusty, remove the dust using a vacuumcleaner. When doing so, please adjust the power on the vacuumcleaner so the suction is not too strong. Also, do not wash the grillewith water. This may cause discoloration and sagging of the grille tooccur.

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