JBL 4312G Owner's Manual

2INTRODUCTIONThank you for purchasing the JBL® 4312G 3-Way Studio Monitor.For more than 70 years, JBL has been providing audio equipment for concert halls, recording studios and movie theatersaround the world and has become the trusted choice of leading recording artists and sound engineers. The 4312G honorsthat legacy with the iconic 12-inch (300mm) 3-way configuration that dates back to 1968 with the original Model 4310Control Monitor. Utilizing a compact monitor-type footprint, the 4312G features advanced JBL transducers includingthe JW300SW-8 Pure Pulp cone woofer, the JM125PC-8 Polymer-coated Pure Pulp cone midrange, and the 054ALMg-1Aluminum/Magnesium Alloy tweeter.PACKAGE CONTENTSJBL 4312G loudspeakers are sold in mirror-image matched pairs. The outer carton serves to protect two internal cartonseach containing a single loudspeaker with a removable grille.PLACEMENT AND POSITIONINGCAUTION: The 4312G weighs 55.5 lb. (25.2 kg) each. Before placing the speaker on a shelf or platform, be surethat it is sturdy enough to support the speaker’s weight.Before deciding where to place your speakers, survey your room and think about placement, using the illustration belowas a guide.• Avoid placing the speakers near power amplifiers, min 20 inches(50cm)6-8 feet(1.8-2.4m)40° – 60°Listening Positionheatregisters or other objects that generate large amountsof heat.• Do not place the speakers in very humid or dusty places.• Do not place the speakers in direct sunlight or where they willbe exposed to other strong light.• For best results, place the speakers 6–8 feet (1.8-2.4m) apart.If you place the speakers farther apart than this, angle themtoward the listening position.• The speakers will produce the most accurate stereosoundstage when the angle between the listener and thespeakers is between 40 and 60 degrees.• Position each speaker so that its tweeter is approximately atear level.• Generally, bass output will increase as the speaker is moved closer to a wall or corner. For best performance, werecommend that you place the speakers at least 20 inches (50cm) away from the side walls.• The 4312G may be stand mounted with the optional JBL metal stands (model JBL JS-120, sold separately) that anglethe speaker upward.LEFT AND RIGHT PLACEMENTThe JBL 4312G is sold as mirror-image pair of loudspeakers with one having the tweeter on the left side and the otherhaving the tweeter on the right side, yet neither one is marked or defined as a “LEFT” or “RIGHT” channel loudspeaker.Which one should be used for the left channel and which one should be used for the right channel will depend on acombination of factors including the listening distance from the speakers, the width of the room, acoustic reflectivity ofthe room, and horizontal versus vertical positioning of the loudspeaker.It is typically best to position the loudspeakers to create a triangle of three equal sides when measuring the distancesbetween the tweeters in each speaker and the distance from the listener to each tweeter. In smaller rooms or instanceswhere the listening position is relatively close to the loudspeakers, this will usually result in the tweeters beingpositioned to the inside of the listening triangle. This positioning can also be desirable in a more acoustically reflectiveroom or when the speakers are placed on a shelf or close to a side wall.