Run with two separate subs and you’ll never look back. I have the III’s with two subs still happy 5 years later. No bi-wire and No plans for upgrades. Sound stage is amazing at all volume levels.
I have two SVS self powered subs that I connect via RCA to the preouts on my preamplifier. I wouldn’t get caught up in pinpointing a specific frequency but you could use 50-60 as a starting point. The main point for me was making sure the subs blended with my speakers. You don’t want to hear the subs, you will find a sweet spot. Play some music at different volume levels and mess with the level and frequency knobs until you’re happy with the sound. If I recall you can adjust phase also. I’m not familiar with your subs but just play around with them. I don’t think there’s a set rule you have to abide by as far as frequency goes. Just set it where you think it sounds good for you. I do have both subs set the same once I get it to my liking. This is what works for me in my room with my setup. Good luck!
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