How much is the tunning??for RF T2 subs

it's before...

there is the subzone

12" Rectangular Vented Enclosure

11 1/8" Woofer Cutouts

Volume-2.0 cu ft airspace

Box Tuning-30 Hz

Built from 3/4" MDF

1 1/2" Front Baffle

Terminal Cup w/Gold Plated Binding Posts

Charcoal Gray Carpet

Recessed Baffle Finished in Textured Black

16" h X 22 1/4 d X 18" w

q-logic:------- Dado groove and miter joint design for ultimate strength

• 100% 5/8 in MDF construction

• Spring-loaded terminal cup with 5-way binding posts

• Easy-reference port tuning chart included

• 4 inch port can be cut for perfect tuning with easy instructions

• One-piece grill accomodates large roll surrounds

• QxE ring allows for a range of mounting diameters

• 2 cu. ft. internal volume

• Trapezoid shape better utilizes trunk space

• Includes woofer mounting screws, poly fill, speaker wire

• H 18 3/4 in x W 23 in x DT 13 in x DB 18 1/4 in

SUPPOSIBLY THESE ARE THE RIGHT BOXES FOR MY SUB