Hi-Fi Cable Connection & Testing

I need assistance with setting up my stereo hi-fi system, specifically connecting the speaker cables to the amplifier and speakers. I have included a photo of the cables being used for reference. Once the setup is complete, I would also like the system tested for sound quality to ensure everything works perfectly.

Additionally, I’d appreciate some advice regarding upgrading my current streamer to improve overall performance. If you have experience with hi-fi setups and are confident in making sound-related optimizations, I’d love to work with you!