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Originally Posted by opnly bafld
Skypickle, all powered subwoofers that have speaker inputs use a step down converter before the signal goes to the sub amp. REL and others recommend using the speaker level input as noted above. You can try it both ways (one at a time) and see if you have a preference.
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I might add, many subs have both input types (low level and speaker inputs) as a convenience since not all preamps have multiple outputs. My McIntosh C2300 for instance has "main" XLR & RCA, plus two sets of XLR & RCA outputs so it makes my choice easy...RCA's. If your sub only had an RCA input, but your preamp only one output, you'd need to use an RCA Y cable to feed both your amp and your sub simultaneously. Not ideal. If your preamp has a second set of outputs, I'd at least try it both ways. It's a more direct path for the signal using a low level connection (XLR or RCA) to the sub. Pick the one that sounds best and offers the best level adjustment of the sub.