Hello,
It sounds like it will push the Focal’s just fine. Typically older stuff had two sets of speaker posts. Even if the Focal’s dip down to 4 ohms you will be fine. I would not bi-amp off the Sansui. Stick with one set of speaker posts and use jumpers on the speakers if you need them. Due to the deal your getting its worth it. Later you can upgrade the amp to get better headroom and sound stage. You might be able to add an amp to the Sansui and then add a better preamp like a Rogue tube preamp with a SS amp. Go for it. Speakers make a huge difference in your system.
It sounds like it will push the Focal’s just fine. Typically older stuff had two sets of speaker posts. Even if the Focal’s dip down to 4 ohms you will be fine. I would not bi-amp off the Sansui. Stick with one set of speaker posts and use jumpers on the speakers if you need them. Due to the deal your getting its worth it. Later you can upgrade the amp to get better headroom and sound stage. You might be able to add an amp to the Sansui and then add a better preamp like a Rogue tube preamp with a SS amp. Go for it. Speakers make a huge difference in your system.