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Quote: Originally Posted by isaeagle4031 Not sure how you would use the Spuds unless you make some changes to the design as the horn mouth exits out the sides of the enclosure not directly in front of the drivers. Those things are HUGE too!!! I would think that a pair of the 21"s would be big enough as it is! there is a 3rd moth exit option on the finished product for prebuilt... but I'm gonna go with the 21's we will see...

Quote: Originally Posted by regularjoe I do not run the CNC at work. But I do know we got it used from a cabinet maker to but our wood for our garden, bay, and bow windows. It is a Thermwood, as mentioned earlier, and they use mastercam to program the job then send it out to the CNC where they pull it up and run the job. All I do is hand them the paper with the sizes and go back later and stand there while it is cut. I built the whole box at...

what car is it going into ? 4 21"s would be CRAZY !!!

Quote: Originally Posted by Hugh G. Rection adjust the amount of port area on the enclosure, will drastically change the passband of the enclosure. if you have a very small range of frequencies that you are efficiently reproducing, the you have too much port area for the specific application. I'm gonna disagree and say that the port area has nothing to do with the passband of the enclosure. So long as the port length is changing to keep...

Ok I took care of that then. Here are two more pics with a little better angle. I didnt have a roundover bit so I took the edge off with a tablesaw then rounded it with a disc sander. Then smoothed it with a palmsander. I also rounded the corner of the port wall. [IMG] [/IMG] Thanks for all complements I am very happy with the outcome. Way better than the sealed box I had.

When a driver is mounted close to a baffle plate, trunk lid, etc, it loads the woofer by means of the air in front of it compressing. With 2 inches clearance, it is going to load a little, Idon't know how to properly design around it, but 4-6 inches clearance on an 18 is sufficient. On a sealed enclosure you end up making the box larger to undo the effect, as the box 'cushion' would be intensified. Ported, I imagine, youcould...

Is that supposed to be going into a car?

well i was thinking last night and i figure that i will just get the D2 HDC3's and get another AQ2200D and strapp them i think i will be able to get 14ft^3 easily and i think that will be enough from what i was reading. thanks for the help in deciding but i think i will still tune to 35hz because 38 sounds good and loud to me now with the 12's but i think lower will be better for me.

Here is my box design for my new Audioque hdc 18' in my 1992 civic sedan 5 cubes net after all displacements. Woofer will fire up into trunk lid with about 2 inches of clearance, port 75 square inches of port area tuned to 38hz firing forward into car. Does this sound like a good Idea?

just build it as strong as you can even if you dont plan on having the wall forever its well worth the extra time and money to go overboard with the 2x4s and fiberglass