I didn’t say you need a sub to get good bass. I don’t have subs in my current setup nor did I have subs in my large dedicated audio room. But I had large speakers with 11” woofers and used the Cardas/Jim Smith speaker positioning to get maximum clean bass.
My reply was to the OP was to add subs to get better bass at lower volumes especially in a larger room. No matter what size of speaker you have, the lower the volume, you won’t have the volume of air to get bass. This also is true in a smaller room because you can’t turn the volume up to get the woofers moving.
In my new smaller room, I went down in woofer size (multiple smaller woofers) and now at lower volumes, I get great clean bass. My larger speakers with my larger woofers over powered my room, even with thousands of $$$ of room treatments.