I’m totally ignorant with regard to wiring things. I have an iPhone 14 Pro Max, a FiiO BTR17, and my Apos Gremlin (headphone tube amp) will be delivered Sunday. The BTR17 cannot be used as a simple line out. Is there a way to connect the phone to the FiiO (in wired, phone mode), and use the FiiO 4.4 mm headphone output to connect to the back of the Gremlin via the dual three pin XLR input? Will that work? I do have the 4.4 mm /dual three pin XLR cable. Thank you for taking pity on a noob.