I am currently planning my audio system and will begin work once weather permits. I plan on purchasing 4 Sundown SA-10d4. I have seen many SPL vehicles on video that use these but I'm more focused on sound quality. Although I plan on entering competition so volume will play a part. I was wondering if anyone has experience with these? Are they clean sounding as well as loud? I have 2 Soundstream Rubicon 1000 amps that are just dying for some action. Thanks for any input.