After a long break, I have some updates to share on my build. The sub is now functional and needs some work on the aesthetics. Most likely, I will use a matte finish laminate to match the black ash finish of my ATCs.
So, since last week, I started working to complete the subwoofer as I managed to find a Behringer A500 (bought from member Vin_eme) to drive the Shiva. Out of 6 sides, only one side was pending and had to be sealed after filling the cabinet with Polyfill. Since I have been learning my wood-working ropes, I decided to give complete this on my own and I did

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First I lined the walls with Anutone Synth, then started filling with Poly fill which is used in pillows:
The subwoofer is closed to 4 cubic foot in capacity and consumed 3 pillows full of Poly fill (very close to the recommended fill of 48 oz per cubic feet):
The lid also lined with Anutone Synth:
Applied fevicol on tapped the top gently so it locked itself into position into the dovetail joints:
Made some markings so I could fasten the lid tightly using screws
With my trusty drill, I fastened the lid with self tapping screws:
OMG!! Why so many screws? Typical problem with DIYers, tend to over-engineer
For the baffle, I used a double layered MDF which I had glued together and used D-nuts on the inside. So, I fitted the Shiva Subwoofer with an Allan Key:
Almost done, just need to make the connections to the amp:
Here it is, alive and rocking the house!! (ignore the wiring on the left, been doing a bit of CAT6 networking recently)
I am very happy with the sound outcome, need to work on the aesthetics next. BTW, the Behringer A500 amp is a powerful amp and makes 600 watts per channel @8ohms in bridged mode. But IMO it still lacks the drive and headroom that the Shiva requires. I also noted that Behringer does not publish output specs for 4 ohm in bridged mode and some reviews also said it does not like a 4 ohm load. Nevertheless, it is gonna stay in my Home Theater System. Plan is to use the Behringer for a while and buy a Face Audio F500TS in the near future. The Face Audio F500TS is a superb amp and stable to 2 ohm. So, I can try powering both the Voice Coils in the Shiva X2 in parallel. Currently, I have wired it in series. Check out the amazing spec on the Face Audio F500TS:
http://www.diycable.com/main/product_info.php?cPath=146&products_id=670