It is located under the package tray (at the base of the rear window). You can gain access to it by climbing in the trunk.
The 2013 Cadillac CTS is 6 ft. 0.5 in. (72.5 in.)1 subwoofer(s) wide.
The 2011 Cadillac CTS is 6 ft. 0.5 in. (72.5 in.)1 subwoofer(s) wide.
The 2012 Cadillac CTS is 6 ft. 0.5 in. (72.5 in.)1 subwoofer(s) wide.
The 2010 Cadillac CTS is 6 ft. 0.5 in. (72.5 in.)1 subwoofer(s) wide.
The 2010 Cadillac CTS-Wagon is 6 ft. 0.6 in. (72.6 in.)1 subwoofer(s) wide.
The 2012 Cadillac CTS-Coupe is 6 ft. 2.1 in. (74.1 in.)1 subwoofer(s) wide.
The 2011 Cadillac CTS-V is 6 ft. 0.5 in. (72.5 in.)1 subwoofer(s) wide.
The 2010 Cadillac CTS-V is 6 ft. 0.5 in. (72.5 in.)1 subwoofer(s) wide.
The 2014 Cadillac CTS-Coupe is 6 ft. 2.1 in. (74.1 in.)1 subwoofer(s) wide.
The 2013 Cadillac CTS-Coupe is 6 ft. 2.1 in. (74.1 in.)1 subwoofer(s) wide.
The 2011 Cadillac CTS-Wagon is 6 ft. 0.5 in. (72.5 in.)1 subwoofer(s) wide.
The 2011 Cadillac CTS-Coupe is 6 ft. 2.1 in. (74.1 in.)1 subwoofer(s) wide.