Audio Systems: infiniti j30 car audio system help, infiniti j30, pawn shops

Question
i have a 1993 infiniti j30 i bought recently from an original owner. it had an aftermarket kenwood deck model kdc-mp235 with the original bose with built in amps attached to each rear 6x9 speaker. the 6x9s started rattling and the bass was no longer present so i replaced and installed the rears with some hd 6x9 scosche brand speakers and they sound decent but i no longer have bass. the details about the speakers are the same as the stock bose speakers that were previously installed but these have a lil more clarity as they are new. i want to know what i have to do to get my bass back. i was happy and content with the way those bose rocked my car and were loud and clear at the same time. i was told by other audio proffessionals that i would need to buy a powered amp and do some rewiring and some other things to get bass again but for some reason i doubt that. i dont want anything other than my deck and speakers just like i bought the car. i was also told that i would have to find another infiniti or nissan that has the same exact speakers and replace mines with those. my money is very very limited at the moment and i just paid for intallation and these scosche speakers and dont want anything extra i dont really need. i was also told i may need a new deck to grant the power needed to give me bass but idk im a novice and it would be great if i got the guidance i hope to get. thank you with whatever you can provide.

Answer
Keep the radio, you just need new speakers,
the details about the speakers are the same as the stock ???  HOW ?

scosche brand is junk that is sold at most fleamarkets and pawn shops but besides that i want to know the specs and why they are the same