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Kia Stereo Settings
Sounds like you may have a technical problem. OF course the woofer is in the back, so you should take that into consideration when making settings. I have the Harmon Kardon version, and I'm sure the Bose system would give you more "umph". It requires some pretty good volume level to make it sound good. Of course, Im a Bass lover, so I have the all the way open. I had to play with the Equalizer settings to get the sound where I wanted it.I have a 2025 Kia Sportage Prestige and the stereo system has some real problems. There is very poor Bass volume when using the FM stereo receiver in the car (Tone settings of Bass +10, Mid -2, Treble -2) . Performance improve greatly when providing a signal using Apple Car Play and the Tone setting moved to Bass +3, Mid 0, Trebble +2). In all cases, regardless of signal source the rear speaker (8" diameter, 100 watt sub-woofer, produces very little output, and certainly no Bass sound. My call to Harmon Kardon tech support indicated that this rear speaker is the speaker that should be able to produce window rattling bass sounds. I feel a recall is in order to correct this issue.
Replies
So, if one were to... say... replace the rear speakers... what size and style would be the correct ones to get to have better bass response?Just personal preference. This stereo doesn’t have enough fidelity to notice a difference with anything more than a 3 channel mixer. I have Bass all the way up. Treble 3/4 of the way up and Mid Range a little higher than middle ( just before it starts sounding tinny) I also have the spatial control pulled just a little towards the rear. Just to where you can hear the music move back. The rear speakers are horrible.
Crutchfield is a good resource for that:
https://www.crutchfield.com/m_418550/Car-Speakers-Subs.html
https://www.crutchfield.com/m_418550/Car-Speakers-Subs.html