Re: do i HAVE to put the jacks on the back?
What are you running in the box? If it's a high powered sub, like 500+ watts don't use a terminal cup. Cuz why would you use strong MDF to build the whole box all stiff and nice so it wont flex, and then use a 1/8" thin plastic terminal cup that could flex mass and possibly crack?
Here's what works better. Drill a hole in the back for the wire to come through. inside the box, before you pass the tip out, tie a not or 2 in the wire. put a glob of liquid nails on it and then pull it tight to the back of the box. This will seal it up perfectly, put some on the outside too.
Headunit- Kenwood KDC-MP928
Components- 4 Alpine SPR-17LS 6.5" Type R's
Sub- 18" TC-5200
Component Amp- JL Audio 300/4
Sub Amp- Orion HCCA-D5000 at .7 ohms
Wiring- All Stinger HPM Series, Big 3
Enclosure- 3.2 cubes @ 28hz
Battery- Optima Yellow Top
Alternator- 220 amp Iraggi
References: CA.com- Digital B, mtdewelf, SBLAZER, tuckerbucket, GaresTaylan, basebalz13