Your sub experience: Easy or hard?

Recently traded out my older REL T2 for two smaller REL T5x's paired with B&W 805 bookshelf speakers.  Significant sound stage improvement and separation, plus a more balanced low end.  It does take a little time and effort to get the integration right, but the results are worth the effort.  Plus it is fun to do. You will be able to do this.  PS wife walked into the room once setup and said I hate to say it, but it does sound better.  No finer praise indeed. 

very very easy with  lyngdorf amp 😁

I don't think there's a standard answer. It depends on

1. The size of your room.

2. Room treatments.

3. The size (lower frequency extent) of you main speakers.

4. Your requirements, whether it be gentle underpinning or thumping bass.

In my case my room is treated and my main speakers go down to about 70Hz 

I prefer gentle underpinning, and with the main speakers disconnected I adjust so I can barely hear mail vocals. Dead easy

In my experience it depends on the sub and speakers. I have an svs sb16 ultra. It was easier with my klipsch than it was with my tekton's. The tekton's go lower so I had a flatspot in the low midrange so it took a bit of work to fix it.

I have a cheaper sub (Gallo Acoustics TR3) which I enjoyed setting up with my Spendor D7.2s. Before that I just didn’t have the low end in the room, with the sub it filled out the sound how I like it. Took a few days of moving it around, getting up repeatedly to change settings etc, but I am now very happy with it and feel it is as well integrated as it could be. From this experience I wondered what a better sub could do and auditioned a REL S/510 at a dealer with my same speakers, I spent a whole 2 hours trying to get it to integrate and couldn’t, it was always too present. This was even having the gain close to its lowest setting, it just sounded so boomy. It was very frustrating as I thought a better sub would enhance my system but perhaps it was too much sub despite RELs website recommending it. I also wondered if the dealer had set it up wrong given I could barely turn up the gain without it booming through the room. So I’ve had a mixed experience, however in my current system I love my subs integration and wouldn’t be without it.