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ARC System with JL Audio F110 subs

I would like to add a pair of F110 subs to my Focal mains with my all ARC front end. I cannot seem to locate the thread but read some time ago about an issue related to the impedance of my REF 3 balanced output 2 to the JL subs, I was under the impression that I could simply run the L and R balanced outputs to each respective subs balanced input and then fine tune through the phase, trim, frequency and LP filter settings. The issue related to higher demand load on the REF 3 due to impedance issues? If anyone could shed light on this would be greatly appreciated.
supermodified

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supermodified OP
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thanks for the details Al. My intensions are to use the balanced REF 3 outputs solely, one pair to my REF 75 and one from each channel to the respective subs. Currently I feed to the REF 75 through pair of 1 meter Transparent Musiclink (somewhat entry level) and should be able to get away with the same in a 2 meter pair if I position the subs beside and to the inside of my mains. I just read a good article in this months issue of The Absolute Sound by Jonathan Valin in respect to the set up of the 10" JL
E sub in a 2 channel configuration by utilizing SPL meter and the Soundoctor Test CD V 2.6.1. thanks again for your input....Rob
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