You need to get either:
1. An AMP that can use high level inputs.
2. a converter to change high level inputs (speaker wire connection) to low level inputs (RCA)
JL Audio amps will let you just wire RCA inputs to the end of speaker wire connection and use them in the AMP.
Places to look for high level to low level converters:
www.partsexpress.com
www.crutchfield.com
www.jlaudio.com shows their RCA converter to use high level inputs on the slash series amps. I think the e-series can be direct wired to high level inputs.