OEM speakers usually play a full range. Your new speakers are more about a component system. They are ment for mid bass and highs.
There are two solutions to your problem. 1) amplify your front stage. Your rms ratings on the new speakers may be to large for your current power levels. Thus, the excursion is non-existent. Without that, the notes that require the most cone movement will not exist. 2) get a substage. You would get a mono amp (or whatever amp you want) and drive an appropriately sized subwoofer with it. You will want s head unit with a high pass filter and am amp with a good low pass filter.
Just the basics and you could research it yourself and build the sound system that best fits the music you like.
My money is on amping your front stage.