Afforable Speakers (Meet Ultrasonic 20kHz Requirements)

[MasterEnki]

I live in Sydney, Australia - and unfortunately Amazon doesn't deliver here!! - I had hopes for the logic-3 one...

I've looked around for some iPod / iPhone decks, etc. and no one seems to know what the frequency range is - suppliers don't tell you, etc.

Has anyone successfully used any from Sony / Phillips / Dick Smiths Brand(s)?

Also, Portable DVD Players might be an idea... They seem to be Stereo / have 2 speakers... But again, don't enlighten as to the frequency range!!

Has anyone successfully used Portable DVD Player(s) for playing Shannon's subs?

Thanks