1. You need a cigarette lighter voltage converter that reduces the car's 12-14V DC to 5V DC and a USB A to USB C cable (like the one that came with your KANN CUBE).
2. Go to Amazon or some other electronics retailer and search for:
Adaptive Fast Charging Wall Charger Adapter Compatible Samsung Galaxy S6 S7 S8 S9 S10 / Edge/Plus/Active, Note 5,Note 8, Note 9,LG G5 G6 G7 V20 V30 ThinQ Plus EP-TA20JBE Quick Charge with the following Specification: Input 100-240v / Output 9v = 1. 67a or 5. 0v = 2. 0a. (You can find them at $10.99 for a 2 Pack.)
3. A&K is about to release one for Standard XLR connectors but it will be exorbitantly expensive (big surprise not). Otherwise, try Moon Audio for delivery now but they are also expensive, Google for it, or commission one. Depending on what you get, you may then need XLR to RCA converters. It is far simpler to use the 4 pole 2.5mm TRRS or 3 pole 3.5mm TRS CUBE outputs and obtain a cable with a 4 pole male 2.5mm TRRS or 3 pole 3.5mm male TRS connector at the CUBE end and either two RCA male connectors at the other end for your preamp or one 3 pole 3.5mm male TRS connector at the other end to connect to your car's analog input. (Set the CUBE's amp to low gain)