I use Bluetooth through my phone.I don't have a stereo, but have a large portable speaker that I stick behind the seat. Lasts for hours (over 10)
I do have a little remote unit stuck on the dash, which pairs with the phone and allows me the basic functions of volume/skip/pause, so I can keep the phone in my pocket.
![[Linked Image]](https://www.tm-img.com/images/2021/03/06/xQKDExT-5nqHKJgS4ujTBBGc6v7TfLOE7REkV4iXRDkjxUHSKQ_se8adfTNQlc-XY_ZCRx2i7HKvBGdNaYNjVoAxo03jM4c3kX5b0BEDmc7PgwZmaOY3qZ_CsHybqMvsvqK7eQodAvm81oBr1bdpwtfbbmMKk0XEowFtB9x0Ghl6R19d9mI7IAKRjg1XinEuarIGuo57.jpg)
If I was going to hard wire anything in, I'd probably just go for a discreet Bluetooth Amplifier and a couple of speakers.