Yes, you can feel vibrations in Eon at idle and high speeds because the car uses a 814cc, 3-cylinder engine. The three cylinder engines has inherited vibrations, thus you feel the thrum at idle and high speeds. The performance of the vehicle is also not that good.
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There are many options available for a 2 DIN music system for Hyundai EON in the market. You can check with a local car accessory shop to know about the options in detail. Also, you can check out some options on our online shopping portal. Please find a link below to check out the music systems http://shop.cardekho.com/car-accessories/music-systems.html