Dual 18 Inch PORTED Subwoofer Box Design

$8.88 Regular price $49.99 Sale price

You Save 82% ($41.11)


Dual 18 Inch PORTED Subwoofer Box Design

The volume of this box is 10.4 Cubic Feet and is tuned to 32 hertz


Blueprints (only) – How to make (NOT the actual box)

A PDF of the blueprint (box design) will be emailed in approximately 30 minutes after you order. If you don’t receive it, please check your spam folder or contact us at hello@ctsounds.com.

Note: All box-designs (blueprints) are non-returnable. There is no refund on box-designs.

Customer Reviews

Based on 7 reviews
Dual 18" ported sub box design

You get the download within seconds of purchase. Great box, the 18's hit super low and loud, the box is pretty huge, but what would you expect for this kind of box right.

Matthew Johnson

Dual 18 Inch PORTED Subwoofer Box Design

Jeremy Strain
My review of box plan for 2 18 inch subwoofers

I received the download very fast. It was easy to understand. However, I didn't really like what I received. Now I'm not complaining about it but, since you are asking for a response. Everything I have seen on top YouTube channel and professionals they recommend all the corners internally rounded or 45s cut and glued or fiberglassed in smoothly for a smooth roll off. The plans you sent had several straight ripped strips to place on inside of cabinet enclosure that left many straight edges. I actually own a custom cabinet shop and those braces in design are actually useless as no matter how they are attached internally to the surrounding walls they will not stop flex. Those type of axis supports are used in situations where an outside down force or something very heavy would be applied to the top pushing down or vise versa for support which has nothing to do with this schematic. I do understand that you make these type plans for everyone to be able to build and for the price I paid I suppose I got what I paid for. Thanks and hope I don't sound rude or anything

Herman Parker

Have not received my box yet


I like it so much I need to get another one..