It all depends on sensitivity of your Spica. If the main speakers are very efficent, you would have problem even feeding the sub amp directly from the line level output. On the other hand, if they have low sensitivity, you might be fine. Another thing to worry about is the crossover point of your Velodyne in respect to the subwoofer output signal. Velodyne has built-in 85Hz, it is better to set the Velodyne crossover point to about double of your filtered frequency. Let me know if you have more questions.
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