Best place to insert a new higher end cable in my system?

Hello. I picked up a good deal in a Audioquest Water 1.5m cable. It’s the most expensive one in my system. I have mostly other AQ cables such as Mackenzie, Sydney, a Columbia and an old school AQ cable going from my amp to preamp that sounds pretty good. Components include amp, preamp, phono preamp, server, streamer and universal player. I have a Cardas Blue Heaven phono connect going to my phono preamp but on occasion use a step up transformer former and use an old school Musical Concepts super connect II .5 meter from the SUT to the phono preamp. Where will I get the best performance from this Water IC? Thanks for your consideration and feedback.