Buying subs need help

[Johnreeves1 0]

First off I have two alpine pdx 600.1amps each amp is producing over 700 watts I want to buy 2 fi ssd 12s run 1 off each amp anyway here's the questions when ordering I'm asked about flatwind coil yes or no copper coil yes or no and bo power. Could someone explain this to me and what I should do to answer these questions thanks

[KU40 173]

https://ssl.perfora.net/www.ficaraudio.com/sess/utn;jsessionid=154adacd7f48259/shopdata/0070_Tech/0070_Speakers/0040_Tech.SSD/product_overview.shopscript

[Johnreeves1 0]

Thanks