You will need to make some sort of wiring harness
I can do that using this: First link
Or this: Second link
Do both accomplish the same function?
Look there, right the first picture clarify the problem: Multiple SPI Slaves. Common MOSI, MISO, SCK and an extra SS for each slave.
Thanks, the image did help. So I need the MISO, MOSI and SCK pins for the SD card and every single one of the amplifiers, plus one of the I/O pin for the CS pins of these elements. That means, pins 11, 12, 13 for MISO, MOSI and SCK and pins d0-d10 and a0-a5 for the SD-Card (one of the pins) and for the amplifiers (sixteen).
Thank you so much!