Yes.
You can choose a sub that has speaker-level inputs, or solder up your own voltage divider network with speaker leads for the input and RCA jacks for the output, or get one of these:
http://www.audio-magus.com/SubLine_Subwoofer_Connector_p/slv2.htm
In either case, you essentially wire the subwoofer's amplifier in parallel with your speakers. There will be no effect on your amplifier or your speakers.
Duke
dealer/manufacturer
You can choose a sub that has speaker-level inputs, or solder up your own voltage divider network with speaker leads for the input and RCA jacks for the output, or get one of these:
http://www.audio-magus.com/SubLine_Subwoofer_Connector_p/slv2.htm
In either case, you essentially wire the subwoofer's amplifier in parallel with your speakers. There will be no effect on your amplifier or your speakers.
Duke
dealer/manufacturer