Alrighty, Here is going to be a step by step (sortof) build thread of the Infinity Kappa perfect 12vq MidQ subwoofer designed by our very own members avaserfi and WmAx. This is the first build thread of this subwoofer so if your intersted keep reading! The plans to this subwoofer can be referenced in this thread:
http://forums.audioholics.com/forums/showthread.php?p=429925#post429925
I am building two of these to be used in a strictly 2 channel system as a stereo pair. Powering them will be the Behringer EP2500, For the crossover, The Behringer DCX2496 and for the driver the Infinity Kappa perfect 12vq using the MidQ insert. For the cabinet I am using 3/4 inch Birch 7ply which I purchased at lowes for $55 per 4x8' sheet. I am building the sub exactly as specified in the other thread with the exception of the front panel which is going to be two peices of the 3/4 ply laminated together to allow me to flush mount the driver.
For two subs I needed just over 2 1/2 sheets of the plywood. I originally figured one sheet per sub, but forgot that I needed TWO sides and a top AND bottom. DOH!
Build Day One
Bought the plywood today and got all my peices cut. Everything is within 1/32 tolerance or less (took some time to square everything and reset the saw exactly for each cut of a new dimension. Luckly I have my dad to help rip the peices because its not a one person job ripping full sheets of plywood to exacting specifications on a table saw.
To get the most out of the plywood I ripped things according to size starting from the biggest down to the smallest. The first cut was ripping the sheet right down the middle at 24" Then going down the line to the smaller peices.
Before starting I printed out the pictures and cut list and then labeled each peice with a letter which makes it much easier to identify which peices are which and also which peices go where in the diagrams.
Once all my peices were cut I decided to start with the upper portion of the port, I rounded over the edges that are going to be the "intake" of sorts for air, It would look better for the roundovers if everything was put together with 45 degree cuts but since this is inside the subwoofer I dont really care. I know that it would have been better to have a bigger flare but this is the roundover bit I had so its going to have to do. I dont think I'll be able to round over the slot in the front of the sub though without cutting it into a bunch of peices and then re assembling it which I am not going to do as it would only weaken the front baffle and make things more complicated.
I very lightly sanded the peices with some 220 grit on a sanding block made from a peice of wood not needed. before gluing them to make sure all my edges are square.
My two upper port portions glued and nailed together with a brad nailer.
For glue I'm using some titebond 3, I have a bunch of titebond 2 already but this says its the strongest there is so.. whatever. I'll give it a try
I also used a small peice as a spacer to make sure the 3/4" that overhangs to join with the next part of the port on the back was exactly 3/4" When sanding I like to use the wood block as it will not round over your edges and will allow you to sand very evenly. I am only doing a light sanding to remove any dirt and anything left behind from the saw even though I did install a new blade before starting.
Thats it for today! I'll just keep assembling the inside parts for now because I need to wait for my drivers and binding posts to arrive before I can really finish the front and back panels and make this thing start looking like a real sub. Stay Tuned!
