Hi guys, Just upgraded my radio from an old JVC one to a new Sony MEX-N4100bt, now its a classy radio system with everything i wanted, but i cant seem to get the bass settings right, so i got 2 new front speakers 60watts vibe ones and i got 2 rear speakers 6x9s in the parcel shelf 420watt also vibe, now with the JVC system all i done was turn up the bass +04 and the treble to +03 and the bass from the speakers would make the car vibrate on around 17 volume, now with the sony i've adjusted as much as i can and have the megabass setting turned on but cant get the bass to sound or feel like t