Stupid question of the day

http://www.crutchfield.com/S-DFcYdXoGopQ/p_119ILJRY2F/Monster-Cable-1-Male-2-Female-RCA-Y-adapter.html

Or, you could try this.

No. The Crutchfield and RS devices are not suitable except to sum the output of speaker-to-line converters. The Xantech will do fine although there are many alternatives.

Kal

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the only stupid question is the one not asked

That response usually comes from people who have never been a teacher. I taught for 9 years in an associate degree program and I got asked a lot of very stupid questions.

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I would be cautious choosing any of the devices that have been suggested, including the devices shown as alternatives on the Amazon page that was linked.

Many of them indicate maximum power ratings in the area of 30 to 80 watts, which may or may not be adequate for your purposes. Some, such as the Pyramid NS60, have low input impedances (10 ohms for that model). That will consume a significant fraction of the power capability of your amp; it will significantly lower the impedance the amp has to drive; and it will generate heat. Most of them do not specify output impedance, but if the input impedance of your sub is as low as say 5K or 10K, as is often the case, I wouldn't be surprised if the output impedance of some of the adapters is too high for good sonics.

None of the adapters I have seen provide specs that are both complete and clearly acceptable.

Personally, I would build something myself. Aside from the connectors and a small enclosure, all that is required are two resistors on each channel. Let us know if you'd like further specifics on that.

Regards,
-- Al

DIY here:
http://www.tkk.fi/Misc/Electronics/circuits/speaker_to_line.html