Just blow the wad on an extender and plug in.
https://www.amazon.com/dp/B07N1WW638/ref=cm_sw_r_cp_apa_fabc_dlT1_8H6DE1BG3EKC3XZ4EQJG
Let a box designed for WiFi do the work.
Actually you never explained how you go WiFi from a computer to an analog system.
Hard to help anyone when one doesn’t know what’s goin’ on.
And lose the iMac. Another computer will not get you to heaven.
A $100 Ras Pi 4 and most everything else runs Roon. You will often get better sound without it.
https://www.amazon.com/dp/B07N1WW638/ref=cm_sw_r_cp_apa_fabc_dlT1_8H6DE1BG3EKC3XZ4EQJG
Let a box designed for WiFi do the work.
Actually you never explained how you go WiFi from a computer to an analog system.
Hard to help anyone when one doesn’t know what’s goin’ on.
And lose the iMac. Another computer will not get you to heaven.
A $100 Ras Pi 4 and most everything else runs Roon. You will often get better sound without it.