Hi, I have an Amazon 7 Fire tablet which I use as a cheap way of getting Spotify, internet radio etc... by plugging it into my hi-fi or boombox via the Fires headphone socket but even though the sound quality from the fire is not bad the sound level from the headphone socket is a little quiet, is there any kind of booster amp thingy that can provide some extra volume without degrading the sound quality or even improve it further (if that's even possible)?