I'm not familiar with the SP9 so I looked it up. With 20dB gain at line level and
can do 50V RMS output, it can definitely drive the F4 well.
The part William suggested is good and avoids a potential problem, especially
if you might not be able to select parts that operate in a specific range.
can do 50V RMS output, it can definitely drive the F4 well.
The part William suggested is good and avoids a potential problem, especially
if you might not be able to select parts that operate in a specific range.