Easy way to make a router template - Plate amp inset

Hi Everyone,

It's been a very long time since I sold all of my tools. I find myself now wanting to modify a pair of speakers to accept a plate amplifier. The speakers right now have a panel with speaker terminals which is a little small and will have to be enlarged, plus if possible I'd like to inset the plate so that it's flush with the back panel.

Is there an easy way to build a router template for a rectangular shape?

Thanks!

Erik
 
4 lengths of wood.
Butt one end only, t'other end overhangs,
Adjust to size you want - no precise cutting.
You can use as the jig or as a jig to rout a sheet of MDF to make the final jig.
The second option is easiest as you can screw the timber to the MDF.
The MDF can then be clamped to the speaker, no screws required in the speaker.