All Known Speaker Enclosure / Pod & Adapter Options

[DeltaNu1142]

OK, I went way down the rabbit hole designing a ported dash enclosure. And I did some math along the way for the s's & g's.

Here's the pod with an integrated elliptical bass tube:

It's all the same material/color... I just highlighted the tube in a different color for visibility.

The area of the tube is 264.6 sq mm, so the effective diameter is 18.3 mm. The pod volume without the tube and speaker is 3,483.86 cc, so, figure around 2,800 cc loaded with the tube. I used this website to calculate desired port length for tuning frequency.

The coax speakers I'm looking at have a bottom response frequency of 55 Hz. Here are the tube length calcs for a few tuning frequencies:

55 Hz - 3.2"
70 Hz - 1.8"
80 Hz - 1.2"

Bigger tube IDs require a longer run for the same frequency. I stuck with a small effective ID, but could potentially go a bit bigger.

 

[DeltaNu1142]

I've decided that ported pods isn't the way I want to go; and after printing the pods as uploaded to Thingiverse, it's clear that I have the ports facing up instead of down like I'd intended.

The only trouble is, the Thingiverse pods allow for a max top-mount depth of 2.25", and I've selected Polk MM552 speakers with a depth just a hair over that of 2.36".

The MM series have epoxy-coated crossover components on the back, and a pretty prominent bump on the back. I should be able to reshape the shell of the pods to accommodate the protrusion of the MMs and still have room behind the pods for wires (I hope). The other option is to thicken up the mounting ring on the face of the pods, but I don't know how much front clearance will remain between the speaker and the grille.

 

[DeltaNu1142]

I modified these pods to fit deeper speakers/provide more volume. The depth from the mounting face is 62mm/2.44" and the pod volume increases from 703.6 cc (which I had totally wrong in my first post on this) to 736.8 cc. I might be able to add a little more by smoothing out my edges.

 

[DeltaNu1142]

OK, the Polk MM522 speakers are definitely too deep for the regular pods:

About 3mm too shallow. I added 5mm to the depth of the pods in the previous post, but I figure I've got some more room in the dash so I added even more space in the back of the pod for that bump:

Printing now. And I guess I'll have a pair of regular pods up for grabs if anyone wants them.

 

[UhOh]

OK, the Polk MM522 speakers are definitely too deep for the regular pods:

View attachment 675044

About 3mm too shallow. I added 5mm to the depth of the pods in the previous post, but I figure I've got some more room in the dash so I added even more space in the back of the pod for that bump:

View attachment 675045View attachment 675046

Printing now. And I guess I'll have a pair of regular pods up for grabs if anyone wants them.

Would be interested in the regular pods ...!

 

[DeltaNu1142]

These dimensions would have helped me a lot during the development of my custom dash pods, but my Jeep was inaccessible. These are the later-model front speakers:

A: 40mm
B: 59mm
C: 19mm
D: 27mm