loss of bass after filling stands

Spiking and filling your speaker stands may give you tighter bass, but not the deepest bass your 2 way speakers are capable of. Place vibrapods between speaker and base
and you will experience deeper more extended bass.....only takes a couple minutes to try. Floor standing speakers are a different matter.

which stands are the ones you have BMPNYC?

Soundwatts, the stand made specifically for the 805's model number is FS-N805. Try going to
http://www.bwspeakers.com/products/ and click on product gallery. When you see all of the Nautilus speakers, you will see the stands as well. They are a perfect fit, with the same contours and the same oval shape as the 805's. They are very well made, as well as elegant. Maybe your dealer will allow you to exchange the speaker stands. I have the silver stands with the 805's in the natural cherry finish.

Hi Martin. If your marble tiles are not spiked to the floor, as suggested above, then the additional weight of the sand is probably allowing the speaker to move back and forth at a lower frequency and cancelling bass. Therefore I agree with the above posts on this point. Adding sand to a stand is not necessarily a good thing. With a speaker that lacks bass, there can be a perceived increase in bass due to filling the stand with sand (if the stand is firmly spiked to the floor. But the reason for this is smeering of the bass note, thereby creating a sense of more bass weight - which I admit can be a pleasing effect with some lightweight-sounding speakers. There can be some beneficial effects of filling with sand, such as damping of the stand's resonance (or even the floor's too), and providing a sink for the speaker's energy. But if you do fill your stands with sand, you should ensure you spike the speaker to the stand so that the energy stored in the (now heavier) stand is released quickly at the interface between the speaker and the stand.

Hi Mark, when you say "spiked", do you mean instead of screwing the B&W 805's to the speaker stand, to use the small spikes that also come with the speakers instead? The coupling of the speaker to the stand is exactly why I thought that the B&W stands were probably a better idea than another brand, even if that brand is very well made. When I first purchased my stands I filled them with sand because shot was hard to find. When I finally found a gun shop in upstate N.Y. that sold shot I changed from 100% sand to alternating between sand, and shot. I got less bloom and a more defined pitch in the bass, but now you have me wondering if I should have used the spikes instead of the screws. Good to hear from you.