[Mike's Hyundais]

Update: I installed a powered sub, get signal from both rear two channels (6 speaker system). And I have no problem with low frequency signal.

 

[Mike's Hyundais]

Adding my 2 cents here....I did my 2023, You have to understand the stock system has bass rolloff, big time! As the volume goes higher, the amp turns the bass signal lower. We have to defeat that. I installed an LC2pro under my seat and a powered sub under the passenger seat. wire runs were so easy!!

Thanks for the information. I build the sub for SQ(sound quality), so the amount of bass from the stock head unit is perfect for me. But yea if you want to feel the bass from your chest, then a LC2 convert is needed.