Template:TRS from T4S to F1 Model 812
The output from the T4S ToneMatch mixer is a balanced mono 1/4 inch (6.35 mm) Tip-Ring-Sleeve and the input on the F1 Model 812 Flexible Array Loudspeaker is a balanced mono 1/4 inch (6.35 mm) Tip-Ring-Sleeve so use a cable like this.
1/4" TRS Balanced Patch Cable (audiopile.net)