Your sub experience: Easy or hard?

@ps 

Bass traps, properly used, are magical.  I use them both for subs and for two ways and it never ceases to amaze me how much better my life is thanks to them.  I simply lack some of the main bass issues (sub or no) others might contend with.

@erik_squires 

The Owens Corning 703 works a lot better for me than the 12" ASC traps I once had.

After hearing an entire hotel full of ASC I can honestly say they are the last brand I would recommend for bass traps.

ATS or GIK would be a better choice, regardless of price.

Super easy for me. I have a pair of Vandersteen 2wq and a pair of dunlavy Athena’s.  Tons of time getting the Athena’s dialed in.  Put the subs fairly close to the mains and not symmetrical in the room or relative to the mains. Started with the cheaper Vandersteen high pass filter which was pretty good but then made a charged balanced high pass filter with Milflex caps.  Had to run two caps in series to get the right value so no need to double up on caps to implement charge balance….yes the battery makes a huge difference. My system has much more detail and separation than before, cymbals sound much more correct, smooth with no fatigue even though the top end seems more extended.  Don’t even notice the subs except for the significantly added body and impact in the bass…still sounds like, well no speakers most of the time but the subs definitely do not stand out…fully integrated.  While the added bottom end (80hz and down) is very nice the biggest benefit came from removing the low bass fro the amp and mains load.  High passing the mains is the only way to go