Do I need a subwoofer?

Hopefully I’ve framed this in a way to help people answer. Up until recently I have had a combo 2-channel/home theater system (Krell preamp with home theater bypass, Bryston 5 channel amp, PSB Synchrony 1s bi-amped speakers, Marantz home theater receiver, Power Sound Audio XV15 subwoofer, Oppo CD player). I wanted extra oomph for surround sound movie watching and occasionally some rock music, hence the sub. I was never really impressed with the XV15 sub (have it for sale now). It is insanely large and I wasn’t sure it was adding the oomph I expected, even after having a local hifi shop owner come out for a listen and tune.

What’s changed: A few weeks ago I inherited my late father’s B&W 801 speakers circa 1980, which I have put in place of my PSBs and am enjoying thoroughly despite the age difference.

My questions: (1) would a sub still be of value in my setup (I still like a lot of bass) and (2) what might folks recommend?

Thank you.