It may be, and they would be labeled sub, but I would bet it probably has a front and rear and either one would work, the only clarion unit I can remember is the Adzest going in a car we are working on now, and it has three sets of pre-outs and another set or RCAs as an input but no amp. But I can granuntee it doesn't have all that, see if they any are labeled sub if not use any of the other two, you will just not be able to use the deck to turn the sub down.
the 315 has front and rear outputs with no specialized subwoofer control. What you need to do is use the rear outputs, and then fade to the front to control sub volume. IE. fade all the way to the front for sub off, right in the middle for full. yeah, speakers in the back seat also stop working, but hey, your the one with no sub level control.
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