So just got my new 2016 dodge journey crossroad with big screen system sounded horrible stock so that lasted but a minute before i changed it all out, upgraded to new 6x9 Hertz speakers all around and a Hertz Amplifier this also lasted but a minute sounded great but i need some bass. Anyone know where i can discreetly add a subwoofer with taking up space (wife not willing to sacrifice space). Any ideas let me know..