I had to ask Sumiko this question too. Here's their response:
"A lot of people find it a confusing concept that it accepts both high and low level. The woofer does not "decide" which one it uses, but simply plays whatever signal it is given, which usually in home theater is both a high and low level signal at the same time. In most cases, if you set your speakers to large, subwoofer yes, the only signal coming through the low level connection is the LFE signal. The REL blends that signal with the high level signal that is reinforcing the bass on your main speakers. When you play music, there is no LFE signal so the only thing that plays through the REL is the high level."
So, this means you don't need to do anything at all. It blends both. Not what I would've figured from the manual but I like this even more. Of course it begs the question that Prd brought up, why have a switch for low and high level? I think I'm going to call them...
leo.
"A lot of people find it a confusing concept that it accepts both high and low level. The woofer does not "decide" which one it uses, but simply plays whatever signal it is given, which usually in home theater is both a high and low level signal at the same time. In most cases, if you set your speakers to large, subwoofer yes, the only signal coming through the low level connection is the LFE signal. The REL blends that signal with the high level signal that is reinforcing the bass on your main speakers. When you play music, there is no LFE signal so the only thing that plays through the REL is the high level."
So, this means you don't need to do anything at all. It blends both. Not what I would've figured from the manual but I like this even more. Of course it begs the question that Prd brought up, why have a switch for low and high level? I think I'm going to call them...
leo.