I have the same situation in my bedroom system, with my Monitor Silver 9i towers. These have adjustable spikes on the bottom, so I was able to angle them up toward bed level. But even if your speakers don't have any adjustments, you could, as previously suggested raise them a couple feet on some sort of solid stand. Actually, this thread has got me thinking of raising mine about a foot.
FAMILY ROOM SYSTEM--Legacy Signature II tower speakers, PSB Image 5T tower speakers, Denon AVR-X5200W, Krell FPB 400cx, Oppo BDP-83 universal disc player, RCA HD-DVD player, Samsung HL67A 750A TV
MASTER BEDROOM--Dynaudio Audience 82 tower speakers, Outlaw LFM-1 sub, Yamaha RX-V1800 receiver, Sherbourn 5/1500A 5-channel amp, Oppo DV 980H DVD player, Panasonic DMP DT210 Blu-ray player, Panasonic 60-ST60 plasma TV.