You can go from the 383 balanced out to the B15 and drive the speakers from there, I think.
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It has been a while since you posted your question but I can add my 2 cents worth. I have the revel B15 in my system which consists of the following; Krell KCT pre-amp, Krell FPB 400cx amp and B&W 802 speakers. I have my main speakers routed to the amp--then to the--preamp thus eliminating the need to go through the subwoofers electronics. To me this important since the whole concept of the krell cast system is to keep the signal as pure as possible. So then the B15 is hooked up with only using one pair of xlr innerconnects from my kct preamp. The B15 no longer will be using the high pass filter built into it. There really is no need to hook it up with 2 sets of innerconnects unless you only have 1 outlet on your preamp. You could also use a zone #2 outlet on the preamp to run the single set of innerconnects to the Sub however this would require the need to control the volume and power separately from your main speakers, but it will work just fine. lastly you could custom split the innerconnect going to your power amp with a y-adapter.
Anyhow, It worked for me, I hope it will for you.