The STR-K670P, part of Sony’s DAV dream system from the early 2000s, was a beast. It wasn’t smart. It didn't have Bluetooth pairing chimes or Wi-Fi handshakes. To make it work, you had to understand signal flow .
If you still have this manual, don't just use it to set your clock. Read it. Notice the lack of ads. Notice the exploded diagram of the chassis. Notice the warning about "adequate ventilation." sony str k670p manual
There is a specific section on "Selecting a Sound Field." The manual lists them like spells: Hall, Jazz Club, Live Concert, Cinema Studio EX. The STR-K670P, part of Sony’s DAV dream system