User manual JBL 4348

[. . . ] In order to better understand and correctly use this product, please thoroughly read this Owner's Manual before using the product. 2: Unpacking The product should have been delivered complete in appearance and functionality. However, if you find any scratches or defects, please directly contact the store where you purchased the product. We recommend that you keep the original box and packing material after unpacking. [. . . ] If you are using a channel divider that has a high-frequency level controller, the gain on the two amplifiers do not need to be the same. *Caution Except for bi-amp configuration with a channel divider, always keep the mode switch in the "Normal" position. The positive terminals of the speaker have a red ring, and the negative terminals have a black ring. Be sure to connect with out mistaking the polarity. The speakers are designed so that when a positive signal is applied to the positive terminal, the woofer moves in the forward direction (positive phase operation). When using the short wires with the gold plated ring sleeves, be sure that both the sleeves and the conductors are securely fastened to the terminals. In addition, use extra caution so that the cable conductors do not touch other sleeves and short out. In order to safely and securely connect to the terminals, we recommend that you use the Y terminals or banana plugs on the cable ends. 5. Attenuator Adjustment Independent, continuous variable attenuators are used for each unit to adjust the MF (mid-frequencies), HF (highfrequencies) and UHF (ultra-high-frequencies) levels to the speaker's woofer level. The 0 dB position for each volume knob indicates a flat-level position in a test room, where there is little reverb. Make adjustments appropriate to the reverb in the actual room, and to your liking. In general, for most speakers, it takes about 1 ­ 2 months after initial use until the unit's vibration system yields optimum performance. As the level balance is expected to initially change with use, we recommend that you readjust the level accordingly. 6: Attaching the Grills The speakers are shipped with the grill installed. The purpose of the grill is to protect the units. The grill may be removed and re-attached as necessary. [. . . ] However, in order to maintain superior sound quality, we recommend that you change the battery periodically. Like the network mode switch, unscrew the screws for the subhatch at the top on the rear-panel and remove the hatch to change the battery. When doing so, check the positive and negative sides of the battery (9V, rectangular 006P type battery) and install it correctly. [. . . ]