Home Brew FRFR

[swarfrat]

Here's the graphs for the 10CX alignments mentioned. The default is for round ports, but I did these as triangular assuming you were trying to incorporate that into yours.It does make for a tighter face.

Grey is the dimensions you listed. (3162 in^3, 45 Hz (4 x 2.625 triangle port 8.5 deep)
Blue is a maximally flat alginment (2776 in^3, 60 Hz (4.0 dia, 4x triangular ports 3.5" x 3.5", 8.5" deep)
Red is the SPL / Excursion optimized box, with the bass hump untreated (2110 in^3, 85 Hz, 4x Triangular ports 4"x4", 6.4" deep)
Yellow is the same box with the -4.5db, f=85 Hz, Q=0.5 applied (Red doesn't show up on the SPL max chart because it exactly coincides with the Yellow - physical capability of the box remains the same)

 

[mayfly]

Very interesting!  smaller box with larger ports tuning it to 60Hz, brought the -3db point down.  Very interesting - and not intuitive!

I think before I build more stuff I need to get some modelling software.

 

[swarfrat]

Here's what I use. It can be picky to get your driver data entered because of the autocalculated parameters.
http://www.linearteam.dk/?pageid=winisdpro

I usually enter
Qms
Re
Cms
Mms
BL
Xmax
Power
Sd
Le

and let it calculate the rest.

 

[mayfly]

Update.  Getting on Finishing the simplex 10 box.  It was a nice day again, so I took it to the back yard.  I've included a photo of the bracing - the cross-braces go to each face of the box including the baffle.  I also found that the leafblower was really great for cleaning sawdust off your work. 

You can't tell from the photos, but there was a massive game of war going on with all the neighbourhood kids.  Just happened that they didn't get in the various shots. 

I've also done a lot of work with winisd pro.  it's pretty fun, but I imagine could really suck you in.  Right now my brainwave is to use the big cabnet as a sub-woofer, and the little 8 incher as a top.  This means I have another box to build for the CX10, but armed with the right tools I'm sure I can come up with something small and good.

Update - sorry about the tilted photos.  I'll see if I can correct them in a bit.

 

[TBurst Std]

I see you got rid of the "white grass"

 

[mayfly]

Yea man.  The weather did that for us a couple weeks ago