Thank you all for the great info on this thread. After reading this and a few other threads, I've changed my plans to use a Wet Sounds WS-420 to try and improve the sound quality. Instead, I'm going to be replacing the existing amplifiers with more powerful apps that I can tune, add a second subwoofer and potentially new speakers. To do this, I was going to have to create RCA dongles from the Connext, but then I found that
@brandonloos_21 makes these harnesses, and he was super helpful in guiding me down this path.
You can get the dongles by creating an out to Brandon. See this thread:
Yamaha/Wet Sounds DSP Harnesses. I sent him a text with questions at 724-884-6120, and he responded soon after with a wealth of useful information.
So, I plan to replace the stock amps with two
Wet Sounds SYN-DX6 using the harness from Brandon at InTune Customs. I'll also add a second subwoofer (
Wet Sounds Revo 10). Once that is done, I'll decide if I also need to replace the stock speakers, as the stock Wet Sounds Recon speakers may not perform well. If that is the case, I'll probably go with the Wet Sounds Revo speakers. Brandon also highly recommends I replace the Wet Sounds soundbar with another set of Wet Sounds Icon 8s. I sure hope this improves the sound quality.
While I love my new 2024 255XD, I'm very disappointed with the quality of the stock sound system, and a bit upset I have to spend this money and time to "fix" it. Yamaha should do better.