looking for a loud speakers for computer

beidog

Distinguished
Oct 19, 2010
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18,510
Hi,
I am pretty new to Home Aduio type of speakers.

my story:
we have a big TV in the cafeteria, a laptop is attached to it via VGA and hide on the back of the TV. we will have a presentation that required loud speakers for this big open space area, so regular computer speaker may not be good enough. and we try to find something can hide or hang with the TV(65in) that has loud sound. so i found the below two speakers.(depth under 10in) My question is how can the laptop with normal 3.5mm jack connect to these speakers. Do i just need to buy a 3.5mm to RCA adepter? like this one :
http://www.amazon.com/BlueRigger-3-5mm-Stereo-Audio-Cable/dp/B008UG6GCC/ref=sr_1_1?s=electronics&ie=UTF8&qid=1380257046&sr=1-1&keywords=3.5mm+to+RCA+speakers


Below are the speakers i picked. Based on my situation, is there any other solution or better speaker is recommended. looking for something below $300, but the cheaper, the better.Thanks!

Polk Audio TL2 Speaker Center Channel
http://www.amazon.com/Polk-Audio-Speaker-Center-Channel/dp/B0043M667M/ref=sr_1_10?s=aht&ie=UTF8&qid=1380256369&sr=1-10&keywords=speakers

Yamaha NS-C310BL 2-Way
http://www.amazon.com/Yamaha-NS-C310BL-Bass-Reflex-Center-Speaker/dp/B001PZ674C/ref=sr_1_2?s=aht&ie=UTF8&qid=1380256498&sr=1-2