4-DD515, DD M1c, 2005 Denali

[Canaan]

Well, here is the start of this build.

Just a port for now. Continues tomorrow. Install Monday/Tuesday.

[Dimwit]

Already looking forward to this build haha

[soundstreamer]

That's an awesome port. Wall or window line?

[4bannger]

that port is insane. how are thoses made. what kind of angel do you cut on each end. 22.5?

[ducatipaso]

That octagon is clutch and I bet you had it in a submission hold when you were tapping it out with that brad nailer.

[Canaan]

An octagon is actually pretty easy to make, if you have the right tools and a second set of hands.

The angles are 22.5deg, I use a Wixey digital angle gauge (best $40 you can ever spend for a table saw accessory).
This port is 196sq inches, 6.375" internal, 7" external cuts. With a good saw, just set the gate and make 8 cuts.

I hold the pieces one-by-one in place and have my co-worker Jay pop a brad 2" from the top and 2" from the bottom on each panel.
Then ratchet strap it together over night, its solid as a rock. The glue holds it, not the brads.

I'll post pics tomorrow showing that the sides are square.
Should have the box finished then.

[Canaan]

The port is solidly square.









Port attached to the front panel and routered out.


Rear wall and baffle bracing. 2.5 x 1.5" baffle brace (connects to side wall) and 6" wedge for the back wall.


I ran out of paint for the port, but here is a nearly finished shot.


I will finish the paint and carpet the box in the morning.

[Canaan]

Completed pics of this box.

[gckless]

Holy giant ports batman. How much area per cube?

[Canaan]

Holy giant ports batman. How much area per cube?

I know this port looks HUGE, but it was actually 196sq inches of port area for at 14.5cuft (net) box.
So the port area per cubic foot was just 13.5sq/cuft.!!!

But, this is a 4-DD 515 build with only 1500wrms. Port noise will NEVER HAPPEN at that level of cone displacement.

The actual 'on paper' numbers for this build were ~14.5cuft @ 38hz. But 'in-cabin' tuning changes alot with big box builds, and I accounted for that change in my design (port firing into the back hatch and the distance to the listening position)

This box build is heavily braced...and I offered the owner the chance to replace the subs, add batts, alts, and a second DD M1c....to get louder.




I just have to say, the owner of this vehicle was stunned after hearing what he had purchased.
I wish I had taken a vid of his reaction....if the owner drops by soon, I will video his review for this install.







also...round ports are more efficient.
Slot-vents are ok, but a round vent is the most efficient vent (for tuning).

[Louisiana_CRX]

Looks good ...

[DB-Audio]

that is sick