If your processor has independent multiple subwoofer outputs and trim controls, set the sub level to within a few dB of the other channels.
My question is should I first do the subwoofer crawl with the one sub at the front of the room, plug in the rear wall sub, run Audyssey MultiEQ, readjust levels with a SPL meter to ensure each is at 75db? I would check with the manufacturer and see if they have anything to say about it.
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With this method, the subwoofer connects to the back of your amp exactly where you plug in your speakers.
Line level converters are small devices that accept speaker wire connections and scale down the speaker level signal to a low level signal RCA jack type output that the subwoofer can accept.
Figure 1 works extremely well especially if you only have one row of seating located a few feet off the back wall.