Cad,
You can do this two ways:
(1) Splice the rear speaker wires and attach new wiring to hook up your sub amp.
(2) Install a crossover and have the lows go to the sub's amp.
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Moderator
www.SN95.com
1994 Mustang Cobra
308ci, ported heads, Crane 2031 cam, Vortech S-trim 11#, FMS 1 5/8 headers, BBK Offroad H-pipe, 2-chamber flows, and several other goodies.
Rebel Racing. Home of Bay Area Mustangs