The Yamaha NS-777 has the widest frequency response range of all the floor standing speakers that we have reviewed. It sacrifices some on the low end of the spectrum but has an impressively high top end. This is primarily due to the variety of drivers and their quality. One of the drawbacks to these speakers is their size and weight, but for the average user of tower speakers, that is only a minor inconvenience. That aside, though, this is an excellent set of speakers.
One of the most appealing aspects of the BIC Acoustech PL-89 floor standing speaker is the incredible range of frequencies that it is capable of reproducing. The manufacture has engineered them to clearly output audio as low as 25 Hz and as high as 23 kHz. This is by far the broadest range we ran into on similar systems, and it therefore makes these speakers our number two choice for people who don't want to add a sub woofer to their audio systems. People who don't want a dedicated sub woofer are few and far between, but regardless, the range is impressive.