Hooking up two Rel Storm III's to Pass Labs X-350

This is as much a question rather than a response, but if you're running 2 Rel's (ie a left and a right), why wouldn't you drive each of them from only one channel? Does the input require two + signals?

I had assumed you would drive the left sub off the left channel out, and right off of right, so you would just leave the yellow lead dangling, or have a cable made up with only 2 leads.

I guess that's my question. The Rel manuel does not address connecting two subs to a stereo amp only to mono blocks. Is it ok to leave off one lead of the high input connector to each sub i.e left to left, right to right . Giving you left & right signal for each channel to each sub. So instead of 3 leads to each sub I have 2 leads to each sub.
Thanks, Greg

With a single sub, the sub will sum the signal on the red and yellow leads, low pass filter it, send it to the internal sub amp, then on to the speaker. With two subs I see two possibilities:

1) Attach the red lead from one sub to the right amp channel output positive and the red lead from the other to the left channel amp output positive. Black lead on each sub to its respective amp channel output negative. Yellow leads unused.

2) Attach the red and yellow leads from one sub to the right amp channel output positive and the red and yellow leads from the other to the left channel amp output positive. Black lead on each sub to its respective amp channel output negative.

Because the sub sums the signal on the red and yellow leads, option 2 will result in each sub being about 6db louder than option 1. It may result in too much bass, but experiment and see.