Can I connect an iPhone (or any 3.5mm device) to USB speakers using a USB soundcard?

Basically my sister has a pair of USB speakers that get their power and audio through USB nothing else. She now wants to start using them with her iPhone, but it has no 3.5mm input. I was wondering if I purchased a USB sound card, like this

http://www.play.com/PC/PCs/4-/34821963/677479847/eForCity-USB-Sound-Card-Adapter/ListingDetails.html?_%24ja=tsid:13315%7Ccat:34821963%7Cprd:34821963&kw=%7Bkeyword%7D

And a male to male adapter like this

http://www.amazon.co.uk/...0012XXX2Q/

Plugged the iPhone into the sound card and the USB cable from the speakers would it work?

I was looking for a powered sound card because I don't know how the sound card or the speakers will get power plus the sound card may only be one way right? (USB to 3.5mm not 3.5mm to USB)

No. Both the speakers and that sound adapters are strictly USB PC audio devices, not plug converters between the USB plug and audio jacks. Those need a PC or other compatible host device to work.

You simply need to either get speakers with aux/line in, or re-wire those so that you can feed audio to their amplifiers, after the USB interface chip.

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