Disclaimer ... I've never heard any of your gear.
So the reason I'm posting is that I have used a subwoofer with a couple of different speakers and may be able to help in that respect. For reference I use a REL strata, which is a sub that leaves the signal to the main speakers intact and is crossed below their rolloff point. This minimizes the clutter in the signal path, but will not allow you to augment any frequencies currently handled by your main speakers.
If you feel the 802s are lacking midbass (the bass you hear) but the brochure says they extend to 30Hz (and I can believe it ... they're not small) then a subwoofer will probably not help a great deal.
If you're happy with the midbass and just feel that the system lacks "scale, impact, and a sense of power" then adding a sub might be just the ticket.
The reason I say this is that I was in a similar position with Spica Angelus. They went very low but the bass was very controlled, and sounded a bit thin. I added a REL sub crossed at 27Hz (where the main speakers run full range and the sub comes in beneath them) and it helped but never really solved the problem.
I then switched to monitor speakers and kept the REL. My monitors roll off sharply below 50Hz but have ample mid-bass. Adding a sub works much better with these speakers and gives me great midbass, and also a good sense of scale and power.
Some subwoofers (usually more expensive ones) can also act as a high-pass filter to the main speakers. This removes mid-bass duty from the main speakers, and I'm sure it's the optimum approach, but I think you'd be spending in excess of $5k to take this approach with a quality to match the rest of your system.
So, in summary if the midbass is OK you could try a REL or velodyne (I don't think you need thousands of watts in a properly designed sub). If midbass is lacking selling the 802s and putting the money towards a larger speaker (like the 801) might be a better way to go.
So the reason I'm posting is that I have used a subwoofer with a couple of different speakers and may be able to help in that respect. For reference I use a REL strata, which is a sub that leaves the signal to the main speakers intact and is crossed below their rolloff point. This minimizes the clutter in the signal path, but will not allow you to augment any frequencies currently handled by your main speakers.
If you feel the 802s are lacking midbass (the bass you hear) but the brochure says they extend to 30Hz (and I can believe it ... they're not small) then a subwoofer will probably not help a great deal.
If you're happy with the midbass and just feel that the system lacks "scale, impact, and a sense of power" then adding a sub might be just the ticket.
The reason I say this is that I was in a similar position with Spica Angelus. They went very low but the bass was very controlled, and sounded a bit thin. I added a REL sub crossed at 27Hz (where the main speakers run full range and the sub comes in beneath them) and it helped but never really solved the problem.
I then switched to monitor speakers and kept the REL. My monitors roll off sharply below 50Hz but have ample mid-bass. Adding a sub works much better with these speakers and gives me great midbass, and also a good sense of scale and power.
Some subwoofers (usually more expensive ones) can also act as a high-pass filter to the main speakers. This removes mid-bass duty from the main speakers, and I'm sure it's the optimum approach, but I think you'd be spending in excess of $5k to take this approach with a quality to match the rest of your system.
So, in summary if the midbass is OK you could try a REL or velodyne (I don't think you need thousands of watts in a properly designed sub). If midbass is lacking selling the 802s and putting the money towards a larger speaker (like the 801) might be a better way to go.