Do you have any available open RCA inputs on the ARC pre-amp? If so, just get a 1/8" to dual RCA male cable, like the one linked here:
https://www.monoprice.com/product?p_id=5597
You can probably get one of these cables at many brick/mortar electronics store or Amazon.
You will plug the 1/8" connector into your phones headphone output, and the RCA's into any available input connector on the ARC pre-amp. This will remove the unnecessary Sony from the chain. For a couple of bucks, it's well worth a shot.
https://www.monoprice.com/product?p_id=5597
You can probably get one of these cables at many brick/mortar electronics store or Amazon.
You will plug the 1/8" connector into your phones headphone output, and the RCA's into any available input connector on the ARC pre-amp. This will remove the unnecessary Sony from the chain. For a couple of bucks, it's well worth a shot.