S2 - JBL Car Audio Service Manual (repair manual). Page 2

This product has been designed to deliver great bass performance from a compact, easily installed enclosure. To get the best performance 
from your enclosure, we strongly recommend that you entrust installation to a qualified professional. Although these instructions explain how 
to install your enclosure in a general sense, they do not show specific installation methods that may be required for your particular vehicle. 
If you do not have the necessary tools or experience, do not attempt the installation yourself. Instead, please ask your authorized JBL

®

 car 

audio dealer about professional installation. To help us serve you better if your enclosure ever requires warranty service, please retain your 
original sales receipt and serial number.

INSTALLATION TIPS
• Always wear protective eyewear when using tools.
• Turn off all audio components and other electrical devices before you start. Disconnect the negative (–) lead from your vehicle’s battery.
• Check clearances on both sides of a planned mounting surface. Be sure that screws or wires will not puncture brake lines, fuel lines or

wiring harnesses, and that wire routing will not interfere with the safe operation of the vehicle.

• When making electrical connections, make sure they are secure and properly insulated.
• Before drilling or cutting holes, use a utility knife to remove unwanted fabric or vinyl, to keep material from snagging in a drill bit or saw.
• Do not mount speakers where they will get wet.

CHOOSING A MOUNTING LOCATION FOR THE ENCLOSURE
Choose a mounting location that doesn’t interfere with cargo, the fold-down rear seat or the trunk lid. The best location is usually a corner 
of the trunk or cargo area. Securely mount the enclosure to the mounting surface.

WARNING: Playing loud music in an automobile can permanently damage your hearing as well as hinder your ability to hear traffic. 
Listening at low levels while driving is recommended. HARMAN International accepts no liability for hearing loss, bodily injury or property 
damage resulting from use or misuse of this product.

CONNECTING THE SUBWOOFER ENCLOSURE 
Setting the Impedance

The Series II Enclosures both feature the Selectable Smart Impedance™ (SSI) 
switch. This exclusive feature lets you set the subwoofer’s impedance to either 
2 ohms or 4 ohms with the flip of a switch (see illustration below). This allows 
you to extract the most from your subwoofer amplifier in any situation.

The SSI 2-ohm setting increases the subwoofer’s output over the 4-ohm setting 
by up to 3dB, depending on the amplifier. Performance is identical in all other 
respects. If the connected amplifier is rated for 2-ohm operation and its 2-ohm 
power ratings are within the subwoofer’s power-handling specifications, setting 
the SSI switch in the 2-ohm position will achieve maximum output.

IMPORTANT: Make sure the subwoofer amplifier is turned OFF before setting 
the SSI switch. Do not change the switch position while the subwoofer amplifier 
is operating. Doing so could damage the amplifier.

2-Ohm Setting

4-Ohm Setting