I have a Av6 as well... and I've been researching and researching on what single sub and box I would like to get. I already have a JL Audio 250/1 amp.. so this is going to be a low power setup..which is all I need for moderate spl with excellent SQ.

I had a chance to recently audition 2 subs at a local store... one had a eDesigns K series sub 12" and an adire audio shiva. The K was sealed in a 1.3 cu box and the shiva was in a 2cu box. Lucky for me they had them hooked up to a JL 250/1 amp. All eq settings and bass boost turned off. And my dave matthews band cd playing in a Nak 45Z player.

After careful listening... I came away and decided upon the K over the Shiva... SPL wise the shiva shook me a little more but the K was a little more controlled in the SQ area. I wouldnt take away any brownie points from either sub... to the average listener they sound almost identical. And with prices that are for budget minded ppl... I came away happy.

Of course the fawkers there wanted $250 for either sub... which I just laughed in their face....

anyways my point.. is that your best bet would be to audition subs locally... and make up your own mind... if not research around and try to get an overall consensus of the quality brands out there and dont just fall for the "hype" .

Lastly.... customer service at Adire and eDesign were wonderful and courteous.