1. Get a 3.5mm TRS (stereo) to Dual RCA (mono) cable. This type of cable has a single 3.5mm jack on one end and two RCA male connectors on the other end.
2. Connect the 3.5mm TRS jack to the stereo output of your audio device (e.g., smartphone, laptop, etc.).
3. Connect the RCA connectors to the mono inputs of your amplifier.
Option 2: Using RCA Y-Splitters/Adapters:
1. Obtain two RCA Y-splitters or RCA Y-adapters. A Y-splitter has a single male RCA connector that branches into two female RCA connectors, while a Y-adapter has two male RCA connectors joined by a single female RCA connector.
2. Connect the mono RCA output of your stereo device to one of the male RCA connectors on the first Y-splitter/adapter.
3. Connect the remaining (unused) male RCA connector on the first splitter to the second Y-splitter/adapter.
4. Now, you have two free female RCA connectors on the two Y-splitters. Take two individual RCA cables and connect them between these female RCA connectors and the desired amplifier (mono) inputs.
