Staticky sound on quality speakers

[Subeternal]

Just got word from a friend using the 2009 Alpha Male training set in the UK that this is the speaker he uses with good results, if it helps:

http://www.amazon.co.uk/XQUISIT-MB-7-POR...126&sr=8-2

I'm guessing this speaker is mono? Is that ok, because I read elsewhere that stereo speakers are recommended.

I've got these speakers:

http://www.amazon.co.uk/SP-101-Powered-P...acme+sp101

They are listed as 20Khz and pass the speaker test (no static or interference) but I'm concerned that they may not be reproducing the ultrasonics well.

I'm really struggling to find some speakers that I know for certain will produce the ultrasonics correctly. I've tried but I just cannot get to sleep using the masked tracks so I would really appreciate it if someone with definite results from using the silent tracks could post their speakers (I'm using an mp3 player, not an iPod).

Thanks!

http://www.klipsch.com/promedia-2-1-computer-speakers

These may be on the pricey side but they reproduce the ultrasonics well and I prefer not to have to charge the speakers anyhow. On the volume changing speaker theres a lineout port to hook up mp3 player/ipod to. You dont need to have a computer to use these. Just hook it up to a surge protector or power splitter with a switch so you dont have to plug/ unplug the speaker everytime you use it. Set the subwoofer to minimum as you obviously wont need that for the ultrasonics.

Otherwise I recommend X-mini II speakers if you absolutely insist on usb speakers. Its 18 bucks on amazon but you have buy 2 for the whole stereo aspect. http://www.amazon.com/X-mini-XAM4-B-Mono...ni+speaker

The audio on them is great and the battery life is amazing even if you dont use them for a while.