[. . . ] Use extreme caution when cutting or drilling in and around these areas. · Make sure there is sufficient air circulation at the mounting location for the amplifier to cool itself. [. . . ] · Make sure there is sufficient air circulation at the mounting location for the amplifier to cool itself. Specifications · 425W RMS x 1 channel @ 4 ohms and 1% THD + N* · 700W RMS x 1 channel @ 2 ohms, 14. 4V supply and 1% THD + N* · Frequency response: 20Hz ­ 330Hz (­3dB) · Maximum input signal: 6V* · Maximum sensitivity: 100mV* · THD + N: 0. 02% · Signal-to-noise ratio: 80dBA (reference 1W into 4 ohms)* · Signal-to-noise ratio: 107dBA (reference rated power into 4 ohms) * CEA-2006A-compliant Speaker Output Connectors · Connect the subwoofer to these terminals, observing proper polarity. Power Input Connectors · +12V: Connect to the positive terminal of the vehicle's battery. Install an appropriate fuse holder and fuse (75A minimum) within 18 inches of the battery. Install protective grommets when routing wires through the firewall or other sheet metal. Factory Bolt Ring Connector Ground Wire DBO (Dynamic Bass Optimization) Variable Subsonic High-Pass Filter With Variable Boost (Q) · For woofers in tuned (vented) enclosures, set the Frequency control to a value 10Hz below the enclosure's resonance (tuned) frequency. Input Connectors (RCA) · Connect to the RCA outputs from the source unit or signal processor. Input-Level Control · Used to match the input level of the amplifier to the output level of the source unit. Low-Pass Filter Frequency Control · 12dB/octave low-pass filter, variable from 32Hz to 320Hz. · See for the adjustment procedure. This product is designed for mobile applications and is not intended for connection to the mains. Features, specifications and appearance are subject to change without notice. Declaration of Conformity Harman International, Consumer Division 8500 Balboa Boulevard, Northridge, CA 91329 USA www. jbl. com © 2009 Harman International Industries, Incorporated. JBL is a trademark of Harman International Industries, Incorporated, registered in the United States and/or other countries. [. . . ] · See for the adjustment procedure. This product is designed for mobile applications and is not intended for connection to the mains. Features, specifications and appearance are subject to change without notice. Declaration of Conformity Harman International, Consumer Division 8500 Balboa Boulevard, Northridge, CA 91329 USA www. jbl. com © 2009 Harman International Industries, Incorporated. [. . . ]