Afforable Speakers (Meet Ultrasonic 20kHz Requirements)

[The GK]

I have the following speakers:

http://www.logitech.com/en-us/speakers-a...vices/4252

http://www.logitech.com/en-us/speakers-a...n=features

Are these suitable?

I was thinking about buying either Logitech LS11 or Creative A60. I went for Creative A60, since the same frequency response is written everywhere I've checked (including their own homepage and package). But for Logitech LS11 there are different Frequency Responses stated at different links (the upperlimit variying from 16 kHz to 20 kHz) and nothing on their homepage or package.

I've only used the subs for a week, so don't know how well the speakers are working yet.