The proper way to do this would be to use the audio output from the TV, either analogue left and right or the optical port, and send it into an dedicated amplifier or AV receiver. You can then use the amplifier or receiver to power the external speakers. If you are using a dedicated amplifier with no volume control you will want to change the audio output setting on the TV to "variable out" as oppose to its current "fixed out"settings. You can find this in the TV menu, usually under the audio settings. This will allow you to use the current TV remote to adjust the audio volume coming out of the external speakers.
When you connect external speakers on sony bravia ex3/32
Connections in the back
Use tv audio output pin to connect home theatre,sound amplifier input signal pin & enjoy
I have a set of speakers by JBL called "Creature" - the set has a large woofer and two small satellite speakers. The cord from the back of the central (woofer) unit plugs right into the "headphone" output on the side of my Sony Bravia. All I did was plug it in there as opposed to plugging it into my laptop. That may or may not be the type of speakers you're trying to add but they are easy and give a good sound. I've freed up a lot of floorspace by using these. Also, I don't crank on the volume so that might also make a difference in why you want to add speakers. 
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