I decided to build a VBSS to add to my setup which consisted of a R-S202 receiver and a pair of Boston a70's in a 10x15x8' high room (that's a guess I didn't actually measure).
In order to connect my receiver to an iNUKE the parts express tech I was talking to recommended a talent SXC unbalanced/balanced converter. I went ahead and ordered the components for the VBSS, an iNUKE 1000DSP, a talent SXC converter, and assorted connectors and cables and stuff.
I picked up a 4' x 8' sheet of 3/4" MDF and a 2' x 4' sheet of 1/2" MDF and cut them to size with a table saw:
The 2' x 4' piece was shaped like a rhombus and I messed up one of the cuts, so the corners were a little off when I glued it on.
I got some corner and bar clamps and some titebond ii and glued the box together:
Next I glued in the internal support pieces (cut to length as I went on a chop saw):
Glued on the two front pieces one at a time (all holes cut with a jigsaw):
Drilled a hole for the speakon connector in the back, did some quick sanding and a flat black rattle can paint job:
Next I drilled all the screw holes. I used #10
x 1" round head wood screws for mounting the driver, #6
x 1" round head screws for mounting the precision ports (I went with 20Hz tuning), and #5
x 1" flat head screws for mounting the speakon connector. Then I put some poly-fil in and assembled everything. I forgot to take a picture after assembling, I will take one when I get home.
I determined that the speaker actually needs to be connected to +1 (pos) and +2 (neg) for bridged mode, so I unscrewed the speakon connector and switched the quick disconnects to the proper pins. Hooked everything up and loaded the settings from the VBSS thread onto the iNUKE and it works great! Very loud. I'm going to have to build a second one in a few months though, I really want to know what that would sound like.
One question: In the text file that provided instructions for setting up the iNUKE (from the VBSS thread):
If using an iNuke 1000DSP to power the VBSS it should be in bridged mode with the limiter set to 71.5Vp
I have much less experience here but I calculated a slightly higher voltage:
PA460-8 is rated for 500W RMS.
According to Wikipedia
I think this actually means 500W continuous average power. Calculating for the peak voltage at 500W continuous average power gives Vp = 89.44 V.
Pavg = Vrms^2 / R ----> Vrms = sqrt(R * Pavg) = sqrt(8 * 500) = 63.24 V
Vp = Vrms * sqrt(2) = 63.24 * sqrt(2) = 89.44 V
If they actually mean 500W RMS then I come up with Vp = 75.21 V
Pp = Prms * sqrt(2) = 500 * sqrt(2) = 707.12
P = V^2 / R ----> V = sqrt(P * R) = sqrt(8 * 707.12) = 75.21 V
Equations from here.
Maybe I'm misunderstanding something or there's some sort of speaker specific nonsense going on but I'd be interested to hear your thoughts.
I plan on ordering a grill frame kit from parts express and when that arrives I want to fix the corners and give it a nicer paint job.
Not sure if I attached the pictures correctly, they seem very large?