JL Audio - Car Audio Systems

10	Driver size in inches
	For fractional diameters, the fraction is dropped, so a 13 1/2" driver would start with a "13" followed by the driver type designation.
W	Driver type
	W : Woofer IB : Infinite Baffle
6v2	Driver Class
	Larger numbers typically mean higher performance levels and more power handling. Current classes are 0, 1v2, 3, 3v2, 6v2 and 7 for subwoofers. When a "v" is present in the model number, the number following the "v" is the "version number" of the driver line. Example: the W6v2 is the second version of the W6 driver line.
-D4	Driver impedance
	If this last number is preceded by a "D" (as in 10W6v2-D4), the driver has dual voice coils each with the impedance of the number given. All IB4 (infinite-baffle) subwoofers were of the 8 ohm variety (essentially IB4-8), and all original W6's are of the dual-6 ohm variety (W6-D6), but the -8 for the IB4's and the -D6 for the W6's were a redundancy and thus were dropped.

Evolution Coaxial and Component Systems and Raw Drivers
As with our raw drivers, understanding the naming convention for our Evolution lines can be best understood by dissecting an example.

XR650-CSi

XR	Series
	The first two letters of the model number indicate the series of the system and/or raw driver: ZR : Reference XR : Premium VR : Better TR : Good
650	Diameter of Largest Driver
	Designates the size of the largest driver in the system or the size of the raw driver: 350 : 3.5 inch 400 : 4 inch 525 : 5.25 inch 570 : 5 x 7 inch 600 : 6 inch 650 : 6.5 inch 690 : 6 x 9 inch NOTE: In the XR653-CS, the largest driver is 6.5" in diameter and the system uses 3 drivers. Denoting the number of drivers in the system is unique to XR653's model number.
CS	Type of System or Component
	CS : Component System CX : Coaxial System TX : 3-Way Coaxial CW : Component Woofer CT : Component Tweeter CM : Component Mid-Range pxo : Crossover cthp : High-Pass Filter
i	Series Independent Information
	TR (coaxials and component sets): The "i" designates that these systems have been engineered to provide enhanced "presence" in the mid-range section of their frequency response curve as well as an increase in broadband efficiency. VR Coaxials: The "i" designates that these systems have been engineered to provide enhanced "presence" in the mid-range section of their frequency response curve as well as an increase in broadband efficiency. VR Component Sets: The "i" designates that these systems have been engineered to provide enhanced "presence" in the mid-range section of their frequency response curve as well as an increase in broadband efficiency. Also, the crossover network of these component sets allows the user to adjust the level of the tweeter. XR (Coaxials and Component sets): The "i" designates that these systems use JL Audio's "intelligent" crossover design. This crossover design allows the user to adjust mid-range presence level, tweeter level and (on the component sets only) gives the system bi-amp/bi-wire capability. ZR Component Sets: The "i" designates that these systems use JL Audio's "intelligent" crossover design. This crossover design allows the user to adjust mid-range presence level, tweeter level and gives the system bi-amp/bi-wire capability.

C5 Evolution Coaxial and Component Systems and Raw Drivers
The addition of C5 to the Evolution line brought about a change to the naming convention listed above.
C5-650x

C	Driver type
	The first letter of the model number indicates the driver type: C : Component
5	Series
	The first number indicates the series of the system and/or raw driver: : 5 : Premium
650	Diameter of Largest Driver
	Designates the size of the largest driver in the system or the size of the raw driver: 525 : 5.25 inch 570 : 5 x 7 inch 650 : 6.5 inch
x	Type of System or Component
	x : Coaxial System cw : Component Woofer ct : Component Tweeter pxo : Crossover cthp : High-Pass Filter NOTE: In the C5-650, the lack of any designation beyond the Diameter of the Largest Driver, identifies this model as a Component System.